ADEX Dental Hygiene Exam — Questions and Answers

Question 1: Which bonding mechanism does polycarboxylate cement use to adhere to tooth structure?

Ionic bond between phosphate groups and hydroxyapatite
Micromechanical interlocking via acid etching
Van der Waals forces between resin and collagen
Chelation of polyacrylic acid with calcium ions in enamel and dentin (Correct answer)

Correct answer: Chelation of polyacrylic acid with calcium ions in enamel and dentin

Polycarboxylate cement forms a true chemical bond through chelation between its polyacrylic acid and calcium ions in the tooth's hydroxyapatite.

Question 2: The OSHA Bloodborne Pathogen Standard requires that the exposure control plan be reviewed and updated at minimum:

Only when a new employee is hired
Every 2 years
Annually and whenever new tasks or procedures are added (Correct answer)
Every 6 months

Correct answer: Annually and whenever new tasks or procedures are added

OSHA requires annual review of the exposure control plan and updates whenever tasks, procedures, or employee positions change that affect exposure.

Question 3: Which vitamin is synthesized in the skin through sunlight exposure and is essential for calcium absorption in the gut, thereby supporting tooth and bone mineralization?

Vitamin A
Vitamin E
Vitamin B6
Vitamin D (Correct answer)

Correct answer: Vitamin D

Vitamin D acts as a hormone that upregulates intestinal calcium-binding proteins, increasing calcium absorption needed for mineralization.

Question 4: During aerosol-generating dental procedures, which respiratory protection provides the highest level of protection for the dental hygienist?

Cloth face covering with filter insert
N95 filtering facepiece respirator fitted and fit-tested (Correct answer)
Standard surgical mask
Dust mask rated P100

Correct answer: N95 filtering facepiece respirator fitted and fit-tested

An N95 respirator, when properly fit-tested, filters at least 95% of airborne particles and provides significantly more protection than a surgical mask during aerosol generation.

Question 5: When screening for oral cancer, the dental hygienist should pay particular attention to which anatomical sites as the highest-risk locations for squamous cell carcinoma?

Labial mucosa and buccal vestibule
Attached gingiva and buccal frenum
Lateral and ventral tongue and floor of mouth (Correct answer)
Hard palate and dorsal tongue

Correct answer: Lateral and ventral tongue and floor of mouth

The lateral/ventral tongue and floor of the mouth account for the majority of oral squamous cell carcinoma cases and require thorough inspection.

Question 6: Which surface barrier is MOST appropriate to protect the dental unit light handle during patient care?

Plastic wrap or pre-fabricated covers changed between patients (Correct answer)
Glutaraldehyde solution applied with gauze
No barrier is needed if the clinician wears gloves
70% isopropyl alcohol wipe applied between patients

Correct answer: Plastic wrap or pre-fabricated covers changed between patients

Plastic barriers on difficult-to-disinfect surfaces like light handles are removed and replaced between patients, protecting surfaces that aerosol disinfectants cannot reliably reach.

Question 7: Which waterborne pathogen is most commonly associated with dental unit waterline contamination?

Pseudomonas aeruginosa
Legionella pneumophila
Hepatitis B virus
Both Legionella and heterotrophic bacteria within biofilm (Correct answer)

Correct answer: Both Legionella and heterotrophic bacteria within biofilm

Dental waterlines harbor polymicrobial biofilms containing heterotrophic bacteria and potentially Legionella, posing risk especially to immunocompromised patients.

Question 8: A simple bone cyst (traumatic bone cyst) most commonly appears radiographically as:

A mixed radiolucent-radiopaque lesion in the posterior mandible
A unilocular radiolucency with scalloping between tooth roots and no cortical expansion (Correct answer)
A diffuse radiopacity replacing cancellous bone
A multilocular radiolucency with sclerotic borders

Correct answer: A unilocular radiolucency with scalloping between tooth roots and no cortical expansion

Simple bone cysts present as unilocular radiolucencies that classically scallop upward between tooth roots; they are empty cavities and teeth test vital.

Question 9: Which cell is the primary mediator of alveolar bone resorption in periodontal disease?

Osteoblast
Osteoclast (Correct answer)
Cementoblast
Fibroblast

Correct answer: Osteoclast

Osteoclasts resorb mineralized bone tissue and are the primary cells responsible for the alveolar bone loss seen in periodontitis.

Question 10: What term describes the accumulation of calcified deposits on tooth surfaces?

Plaque
Pellicle
Biofilm
Calculus (Correct answer)

Correct answer: Calculus

Calculus (tartar) is mineralized dental plaque that forms hard deposits on tooth surfaces above and below the gumline.

Question 11: A patient taking warfarin requires post-operative analgesia after a dental hygiene procedure. Which analgesic is safest to recommend?

Ibuprofen
Naproxen
Aspirin
Acetaminophen (Correct answer)

Correct answer: Acetaminophen

Acetaminophen does not inhibit platelet function or significantly affect INR, making it the safest OTC analgesic for patients on anticoagulant therapy.

Question 12: What is the name of the process by which fluoride replaces hydroxyl ions in hydroxyapatite?

Fluorosis
Calcification
Remineralization
Ion substitution (Correct answer)

Correct answer: Ion substitution

Ion substitution describes the chemical process where fluoride replaces hydroxyl ions in the hydroxyapatite crystal to form fluorapatite.

Question 13: A patient presents with white, cottage-cheese-like lesions on the tongue and buccal mucosa that wipe off, leaving an erythematous base. Which condition is MOST likely?

Oral candidiasis (thrush) (Correct answer)
Leukoplakia
Aphthous ulcer
Lichen planus

Correct answer: Oral candidiasis (thrush)

Pseudomembranous candidiasis (thrush) presents as removable white plaques leaving a red, raw surface when wiped.

Question 14: Methemoglobinemia is a rare but serious adverse effect most associated with which local anesthetic used for topical application?

Tetracaine
Benzocaine (Correct answer)
Lidocaine
Cocaine

Correct answer: Benzocaine

Benzocaine oxidizes hemoglobin to methemoglobin, reducing oxygen-carrying capacity; this is especially dangerous in infants and when applied in large amounts.

Question 15: An ultrasonic insert tip designed for use in periodontal pockets is recognized by its:

Curved arc shape identical to a Gracey curette
Slender, elongated design allowing subgingival access to narrow pockets (Correct answer)
Large diameter and blunt end for safety
Textured surface to improve grip during scaling

Correct answer: Slender, elongated design allowing subgingival access to narrow pockets

Slim-profile periodontal insert tips are designed to access deep, narrow pockets while minimizing tissue trauma.

Question 16: When recording the gingival margin position during a periodontal assessment, what does a negative measurement indicate?

The gingival margin is coronal to the CEJ (pseudopocket) (Correct answer)
The probe reading extends beyond the CEJ
Bone loss has occurred apical to the CEJ
The gingival margin is at the CEJ

Correct answer: The gingival margin is coronal to the CEJ (pseudopocket)

A negative gingival margin value means the gingival margin is coronal to the CEJ, indicating edematous or hyperplastic tissue rather than true recession.

Question 17: The legal document that grants a dental hygienist permission to practice is called a:

Permit
Certification
Registration
License (Correct answer)

Correct answer: License

A license is the legal credential issued by a state dental board that authorizes a dental hygienist to practice in that state.

Question 18: During the assessment phase, a dental hygienist notices gingival bleeding on probing in posterior sextants only. Which periodontal classification best describes localized bleeding without bone loss?

Stage I periodontitis
Necrotizing periodontal disease
Gingivitis associated with dental biofilm (Correct answer)
Stage II periodontitis

Correct answer: Gingivitis associated with dental biofilm

Bleeding on probing without attachment or bone loss is consistent with gingivitis associated with dental biofilm per the 2017 classification.

Question 19: A dental hygienist counseling a patient on caries prevention should recommend limiting intake of which type of food between meals?

Raw vegetables
Sticky fermentable carbohydrates (Correct answer)
Cheese
Unsweetened nuts

Correct answer: Sticky fermentable carbohydrates

Sticky fermentable carbohydrates adhere to tooth surfaces and are slowly broken down, prolonging acid exposure and caries risk.

Question 20: A patient discloses active herpes labialis (cold sore) at the start of a scheduled scaling appointment. What is the BEST course of action?

Apply topical antiviral and proceed immediately
Defer elective treatment until the lesion resolves to prevent autoinoculation and clinician exposure (Correct answer)
Proceed normally since HSV-1 is not bloodborne
Treat only with double gloves

Correct answer: Defer elective treatment until the lesion resolves to prevent autoinoculation and clinician exposure

Active herpetic lesions are contagious; elective dental treatment should be deferred to reduce risk of herpetic whitlow in the clinician and avoid disturbing the lesion.

Question 21: A patient experiences a hypertensive crisis (BP 185/115 mmHg) and complains of a severe headache with visual changes. What is the dental hygienist's MOST appropriate action?

Discontinue treatment, position the patient upright, and activate EMS immediately (Correct answer)
Continue treatment but monitor blood pressure every 10 minutes
Administer aspirin and wait for symptoms to resolve
Administer nitroglycerin sublingual to lower blood pressure

Correct answer: Discontinue treatment, position the patient upright, and activate EMS immediately

A hypertensive emergency with neurological symptoms (headache, visual changes) requires immediate treatment cessation, upright positioning to reduce cerebral pressure, and EMS activation.

Question 22: Sharpening an instrument to restore its cutting edge is indicated when:

The instrument has been used for more than five appointments
The instrument appears visually dull or reflects light along the edge (Correct answer)
The patient complains the instrument feels uncomfortable
The cutting edge has a 45-degree bevel angle

Correct answer: The instrument appears visually dull or reflects light along the edge

A sharp edge will not reflect light; a dull edge creates a rounded, reflective surface visible under light.

Question 23: A periapical radiograph of the mandibular molar region reveals a well-defined radiopacity around the apex of tooth #30, which has a large carious lesion. The radiopaque area has diffuse, ill-defined borders blending into the surrounding bone. There is evidence of a widened periodontal ligament space. What is the most likely radiographic diagnosis?

Hypercementosis
Idiopathic Osteosclerosis
Condensing Osteitis (Correct answer)
Periapical Cemento-osseous Dysplasia (mature stage)

Correct answer: Condensing Osteitis

Condensing osteitis is a localized, reactive lesion characterized by bone sclerosis around the apex of a tooth with pulpal inflammation or necrosis. [24] Radiographically, it appears as a diffuse, non-expansile radiopacity associated with the apex of a non-vital or chronically inflamed tooth. [22, 27] The presence of a large carious lesion and a widened PDL space are key indicators pointing to this diagnosis. [24] Idiopathic osteosclerosis is not associated with an inflammatory stimulus. [6] Hypercementosis is excess cementum on the root and retains an intact lamina dura. [21] Mature periapical cemento-osseous dysplasia is typically surrounded by a radiolucent halo. [25]

Question 24: An anxious 18-year-old patient begins breathing rapidly and complains of tingling in their fingers and feeling lightheaded. The most appropriate initial management is to:

Have the patient breathe into a paper bag.
Administer oxygen via a face mask.
Attempt to calm the patient and coach them to slow their breathing rate. (Correct answer)
Place the patient in a supine position and elevate their legs.

Correct answer: Attempt to calm the patient and coach them to slow their breathing rate.

The patient is hyperventilating, which is causing an excessive loss of carbon dioxide. The primary treatment is to calm the patient and help them control their breathing rate. Administering oxygen can worsen the respiratory alkalosis. Breathing into a paper bag is no longer recommended due to the risk of significant hypoxia and misdiagnosis.

Question 25: The term 'xerostomia' refers to which condition?

Dry mouth (Correct answer)
Tooth sensitivity
Gingival enlargement
Excessive saliva production

Correct answer: Dry mouth

Xerostomia is the subjective sensation of dry mouth, often caused by reduced salivary flow from medications or systemic disease.

Question 26: Which cranial nerve provides motor innervation to all intrinsic and most extrinsic muscles of the tongue?

Glossopharyngeal nerve (CN IX)
Vagus nerve (CN X)
Trigeminal nerve (CN V)
Hypoglossal nerve (CN XII) (Correct answer)

Correct answer: Hypoglossal nerve (CN XII)

The hypoglossal nerve (CN XII) provides motor innervation to all intrinsic tongue muscles and most extrinsic tongue muscles, controlling tongue movement.

Question 27: A patient taking bisphosphonates (e.g., alendronate) for osteoporosis should be counseled regarding which potential oral complication?

Medication-related osteonecrosis of the jaw (MRONJ) (Correct answer)
Increased caries rate
Xerostomia
Gingival hyperplasia

Correct answer: Medication-related osteonecrosis of the jaw (MRONJ)

Bisphosphonates inhibit osteoclast activity and impair bone remodeling, increasing the risk of osteonecrosis following invasive dental procedures.

Question 28: When instrumenting a furcation area with Class II furcation involvement, the BEST instrument choice is a:

Gracey 11/12 curette
Nabers probe and furcation curette (Correct answer)
Universal curette with extended shank
Standard sickle scaler

Correct answer: Nabers probe and furcation curette

The Nabers probe identifies furcation depth, and furcation-specific curettes adapt within the concave furcation anatomy.

Question 29: During a procedure, a patient with a history of epilepsy experiences a generalized tonic-clonic seizure. What is the dental hygienist's FIRST action?

Administer oxygen via nasal cannula at 2 L/min
Clear the area of sharp objects and protect the patient from injury (Correct answer)
Call 911 immediately
Insert a padded tongue depressor to protect the airway

Correct answer: Clear the area of sharp objects and protect the patient from injury

The priority is to prevent injury by moving sharp instruments away and cushioning the patient's head — never restrain the patient or place anything in the mouth.

Question 30: When performing dental radiography, infection control requires that:

The X-ray unit head, controls, and chair must be covered with barriers or disinfected between patients (Correct answer)
Patients remove their own films to avoid contamination
Gloves may be removed before handling the X-ray unit controls if hands appear clean
Film packets do not require disinfection because radiation sterilizes them

Correct answer: The X-ray unit head, controls, and chair must be covered with barriers or disinfected between patients

All surfaces touched during radiography — including tube head, control panel, and positioning devices — must be barrier-protected or disinfected between patients.

Question 31: Which of the following is the MOST common cause of cardiac arrest in the dental office?

Acute myocardial infarction (Correct answer)
Air embolism
Ventricular fibrillation due to drug interaction
Anaphylaxis to local anesthetic

Correct answer: Acute myocardial infarction

Acute myocardial infarction is the most common cause of cardiac arrest in dental settings due to the cardiovascular stress of dental treatment.

Question 32: A hygienist is preparing for a procedure that will generate significant aerosols. What is the correct sequence for donning (putting on) the required Personal Protective Equipment (PPE)?

Gloves, Gown, Mask, Eye Protection
Gown, Mask, Eye Protection, Gloves (Correct answer)
Mask, Eye Protection, Gloves, Gown
Eye Protection, Gloves, Gown, Mask

Correct answer: Gown, Mask, Eye Protection, Gloves

The CDC recommends donning PPE in an order that moves from the body core outwards, finishing with the hands. The correct sequence is: first the gown, followed by the mask or respirator, then goggles or a face shield, and finally, gloves. Gloves are donned last so they can be pulled over the cuffs of the gown, creating a secure barrier.

Question 33: What is the maximum recommended dose of lidocaine with epinephrine for a healthy adult patient in dental procedures?

4.4 mg/kg up to 300 mg (Correct answer)
2 mg/kg up to 100 mg
7 mg/kg up to 500 mg
1 mg/kg up to 50 mg

Correct answer: 4.4 mg/kg up to 300 mg

The maximum recommended dose of lidocaine with vasoconstrictor is 4.4 mg/kg with an absolute maximum of 300 mg to prevent systemic toxicity.

Question 34: Which of the following methods provides the ultimate verification of sterilization success by directly challenging the sterilization process?

Checking the sterilizer's physical readouts for correct time, temperature, and pressure.
Using a biological indicator (spore test) on a weekly basis. (Correct answer)
Observing the external chemical indicator tape for a color change.
Placing an internal chemical indicator strip in each package.

Correct answer: Using a biological indicator (spore test) on a weekly basis.

Biological indicators, or spore tests, are the most accepted method for monitoring the sterilization process because they directly assess the procedure's effectiveness at killing the most resistant microorganisms, such as Geobacillus stearothermophilus. While mechanical and chemical indicators are crucial for routine monitoring of each load, they only show that certain physical conditions were met, not that sterilization was actually achieved.

Question 35: Which probing depth measurement indicates the transition from healthy sulcus to a pathologic periodontal pocket?

4 mm (Correct answer)
3 mm
2 mm
6 mm

Correct answer: 4 mm

A probing depth of 4 mm or greater is generally classified as a pathologic pocket requiring clinical intervention.

Question 36: Which of the following best describes the cutting edge of a universal curette compared to a Gracey curette?

Universal curettes have one cutting edge; Gracey curettes have two
Universal curettes have two cutting edges; Gracey curettes have one functional cutting edge (Correct answer)
Both types have identical cutting edges
Gracey curettes have two curved cutting edges; universal curettes have one straight edge

Correct answer: Universal curettes have two cutting edges; Gracey curettes have one functional cutting edge

Universal curettes have two usable cutting edges, while Gracey curettes have one lower, offset cutting edge.

Question 37: What is the rate of chest compressions recommended for adult CPR per current AHA guidelines?

60–80 compressions per minute
80–100 compressions per minute
100–120 compressions per minute (Correct answer)
120–140 compressions per minute

Correct answer: 100–120 compressions per minute

Current AHA guidelines recommend a compression rate of 100–120 per minute to maintain adequate cardiac output without reducing effectiveness from excessive speed.

Question 38: What three types of dental mirrors are there?

Front surface, back surface, and flat surface
Front surface, concave, and plane (Correct answer)
Front surface, mid surface, and back surface
Front surface, back surface, and marginal surface

Correct answer: Front surface, concave, and plane

Dental mirrors come in three main types, each offering distinct advantages for intraoral examination. Front surface mirrors provide the clearest image by eliminating ghost images, as the reflective coating is on the front of the glass. Concave (magnifying) mirrors enlarge the image, which can be useful for detailed inspection, while plane (flat) mirrors offer a true-to-size image without magnification or distortion.

Question 39: The inferior alveolar nerve is a branch of which division of the trigeminal nerve?

Mandibular (V3) (Correct answer)
Ophthalmic (V1)
Maxillary (V2)
Both V2 and V3

Correct answer: Mandibular (V3)

The inferior alveolar nerve is a branch of the mandibular division (V3) of the trigeminal nerve, providing sensation to the mandibular teeth and chin.

Question 40: A patient reports jaw pain, clicking on opening, and limited mouth opening of 28 mm. These findings are most consistent with:

Trigeminal neuralgia
Masseteric hypertrophy
Temporomandibular joint disorder (TMD) (Correct answer)
Eagle syndrome

Correct answer: Temporomandibular joint disorder (TMD)

Jaw pain, TMJ clicking, and restricted opening (<40 mm) are hallmark signs of temporomandibular disorder.

Question 41: Which vitamin deficiency is most directly associated with scurvy and impaired wound healing in the oral cavity?

Vitamin K
Vitamin D
Vitamin C (Correct answer)
Vitamin A

Correct answer: Vitamin C

Vitamin C (ascorbic acid) deficiency causes scurvy, characterized by impaired collagen synthesis, bleeding gums, and poor wound healing.

Question 42: Which scaling instrument is MOST appropriate for removing calculus from the lingual surfaces of mandibular anterior teeth?

Gracey 11/12
Sickle scaler H6/H7
Columbia 13/14 universal curette (Correct answer)
Gracey 7/8

Correct answer: Columbia 13/14 universal curette

The Columbia 13/14 universal curette is designed for all tooth surfaces and is commonly used on lingual surfaces of anterior teeth.

Question 43: Which type of bleeding index measures the presence or absence of bleeding 30 seconds after probing?

Papillary-Marginal-Attached Index
Sulcus Bleeding Index (Mühlemann) (Correct answer)
Gingival Index (Löe and Silness)
Bleeding on Probing (Ainamo and Bay)

Correct answer: Sulcus Bleeding Index (Mühlemann)

The Sulcus Bleeding Index (Mühlemann) records bleeding within 30 seconds of gentle probing along the gingival sulcus.

Question 44: A patient suddenly becomes pale, diaphoretic, and reports feeling faint during scaling. What is the most likely emergency?

Hypoglycemia
Vasovagal syncope (Correct answer)
Anaphylaxis
Acute myocardial infarction

Correct answer: Vasovagal syncope

Vasovagal syncope (fainting) classically presents with pallor, diaphoresis, and pre-syncope triggered by anxiety or pain during dental procedures.

Question 45: A patient's blood pressure reading is 158/96 mmHg at the start of the appointment. Per AHA guidelines, what is the MOST appropriate action?

Immediately call emergency services
Dismiss the patient and reschedule
Recheck in 5 minutes and consult before performing elective procedures (Correct answer)
Proceed with treatment as normal

Correct answer: Recheck in 5 minutes and consult before performing elective procedures

A reading in the Stage 2 hypertension range (≥140/90) warrants re-evaluation and medical consultation before elective dental hygiene treatment.

Question 46: What portion of the dental tool actually touches the patient?

Double-end
Working-end (Correct answer)
Flat-end
Shank-end

Correct answer: Working-end

The working-end is the specific part of a dental instrument that performs the intended function, such as scaling, exploring, or reflecting. It is meticulously designed with specific shapes, angles, and sharpness to effectively interact with oral tissues and structures. This direct contact allows the clinician to achieve diagnostic or therapeutic objectives safely and precisely.

Question 47: A dentist needs to place a temporary crown and requires a luting agent that has a sedative or palliative effect on the pulp. Which of the following cements would be the most suitable choice?

Zinc phosphate
Glass ionomer
Resin-modified glass ionomer (RMGI)
Zinc oxide-eugenol (ZOE) (Correct answer)

Correct answer: Zinc oxide-eugenol (ZOE)

Zinc oxide-eugenol (ZOE) cement is well-known for its sedative (obtundent) effect on the dental pulp, which is largely due to the eugenol component (oil of cloves). This property, combined with its low strength for easy removal, makes it an ideal choice for the temporary cementation of crowns and bridges. The other listed cements are designed for more permanent luting.

Question 48: Which of the following is the MOST common medical emergency encountered in the dental office?

Vasovagal syncope (Correct answer)
Anaphylaxis
Myocardial infarction
Hypoglycemia

Correct answer: Vasovagal syncope

Vasovagal syncope (fainting) is the most frequently encountered medical emergency in dental settings, often triggered by anxiety, pain, or the sight of blood.

Question 49: A patient presents with generalized 6-7 mm probing depths, radiographic bone loss, and a history of poor systemic control of Type 2 diabetes. How does poorly controlled diabetes most directly affect periodontal disease?

Impairs neutrophil chemotaxis and phagocytosis (Correct answer)
Decreases prostaglandin production
Accelerates cementum deposition
Increases salivary buffering capacity

Correct answer: Impairs neutrophil chemotaxis and phagocytosis

Poorly controlled diabetes impairs neutrophil function including chemotaxis and phagocytosis, reducing the host's ability to combat periodontal pathogens.

Question 50: What does BSA stand for in infection control protocols used in dental settings?

Biological Safety Audit
Blood-borne Safety Act
Body Substance Approach (Correct answer)
Bacterial Sterilization Assurance

Correct answer: Body Substance Approach

Body Substance Approach (BSA) is an infection control system treating all body fluids and substances as potentially infectious.

Question 51: In the context of instrument processing, what does the term 'ultrasonic cleaning' achieve?

Deactivation of prion proteins
High-level disinfection equivalent to chemical immersion
Removal of debris through cavitation before sterilization (Correct answer)
Sterilization of instruments

Correct answer: Removal of debris through cavitation before sterilization

Ultrasonic cleaners use cavitation to remove blood, debris, and bioburden from instrument surfaces, which is an essential pre-sterilization step, not sterilization itself.

Question 52: A conscious patient who ingested an overdose of local anesthetic begins experiencing perioral numbness and metallic taste. These are signs of toxicity affecting which system first?

Renal system
Hepatic system
Cardiovascular system
Central nervous system (Correct answer)

Correct answer: Central nervous system

CNS toxicity from local anesthetic overdose manifests first with perioral numbness, tinnitus, metallic taste, and agitation before progressing to cardiovascular collapse.

Question 53: How many different forms of exposure may ionized radiation cause in the body?

four
one
two (Correct answer)
three

Correct answer: two

Ionizing radiation exposure can cause two main types of biological effects: somatic and genetic. Somatic effects manifest in the exposed individual, such as cancer or cataracts, and can be either deterministic (severity increases with dose) or stochastic (probability increases with dose). Genetic effects, on the other hand, occur in the offspring of the exposed individual due to damage to reproductive cells, potentially leading to hereditary diseases.

Question 54: What mechanisms move oxygen?

Respiratory system and gland system
Circulatory system and respiratory system system (Correct answer)
Circulatory system and blood system
Blood system and gland system

Correct answer: Circulatory system and respiratory system system

Oxygen is moved throughout the body primarily by the coordinated efforts of the respiratory and circulatory systems. The respiratory system is responsible for gas exchange, bringing oxygen into the lungs and transferring it to the blood. The circulatory system then transports this oxygenated blood via the bloodstream to all cells and tissues, delivering the vital oxygen needed for cellular respiration.

Question 55: When implementing motivational interviewing (MI) during patient education, which behavior BEST reflects the 'rolling with resistance' principle?

Providing a written home care instruction sheet
Listing all the consequences of poor oral hygiene
Acknowledging the patient's ambivalence and reflecting it back without arguing (Correct answer)
Directly challenging the patient's reluctance to floss

Correct answer: Acknowledging the patient's ambivalence and reflecting it back without arguing

Rolling with resistance in MI means avoiding confrontation and instead acknowledging and reflecting the patient's ambivalence to reduce defensiveness.

Question 56: A patient taking phenytoin (Dilantin) is most likely to exhibit which periodontal condition?

Gingival enlargement (overgrowth) (Correct answer)
Aggressive bone loss
Gingival recession
Necrotizing ulcerative gingivitis

Correct answer: Gingival enlargement (overgrowth)

Phenytoin causes drug-induced gingival enlargement due to increased fibroblast proliferation and altered collagen metabolism.

Question 57: After an accidental needlestick exposure, the first action the dental hygienist should take is:

Apply a tourniquet above the wound
Squeeze the wound to expel blood
Wash the wound thoroughly with soap and water (Correct answer)
Report to the supervisor immediately

Correct answer: Wash the wound thoroughly with soap and water

Immediate thorough washing of the wound with soap and water is the first recommended step after a needlestick or sharps injury.

Question 58: Which chemical indicator class is considered an integrating indicator and monitors all critical sterilization parameters?

Class 1 (process indicator)
Class 6 (emulating indicator)
Class 5 (integrating indicator) (Correct answer)
Class 3 (single-variable indicator)

Correct answer: Class 5 (integrating indicator)

Class 5 integrating indicators respond to all critical variables (time, temperature, steam quality) and provide the highest level of chemical monitoring.

Question 59: A patient with a dental implant supporting a crown on tooth #8 presents for routine maintenance. To prevent damage to the implant surface, which type of instrument is contraindicated for calculus removal on the titanium abutment?

Titanium-coated curette
Resin or plastic scaler
Stainless steel curette (Correct answer)
Graphite scaler

Correct answer: Stainless steel curette

Stainless steel instruments are harder than the commercially pure titanium or titanium alloy used for dental implants. Using stainless steel scalers can scratch or gouge the implant surface, creating a niche for plaque and bacteria to accumulate, which can increase the risk of peri-implantitis. Instruments made of materials softer than or compatible with titanium, such as graphite, titanium, resin, or plastic, are recommended for implant maintenance.

Question 60: Which of the following findings during an oral cancer screening warrants biopsy referral rather than a 2-week monitoring period?

Fordyce granules scattered on the buccal mucosa
A 4mm aphthous ulcer on the buccal mucosa
A white lesion on the lateral tongue that cannot be wiped off (Correct answer)
A red area on the soft palate following recent denture trauma

Correct answer: A white lesion on the lateral tongue that cannot be wiped off

A white lesion (leukoplakia) on the lateral tongue that cannot be wiped off may represent dysplasia or carcinoma and warrants biopsy referral.

Question 61: Which antibiotic is the first-line prophylaxis recommendation for patients with cardiac conditions requiring infective endocarditis (IE) prevention before dental procedures?

Clindamycin 600 mg
Azithromycin 500 mg
Metronidazole 500 mg
Amoxicillin 2 g orally 30–60 minutes before the procedure (Correct answer)

Correct answer: Amoxicillin 2 g orally 30–60 minutes before the procedure

The AHA recommends amoxicillin 2 g orally 30–60 minutes before high-risk dental procedures as the first-line IE prophylaxis in adults.

Question 62: Which of the following patients is at HIGHEST risk for an adrenal crisis during dental treatment?

A patient taking antihypertensive calcium channel blockers
A patient with well-controlled Type 2 diabetes on metformin
A patient taking 400 mg ibuprofen daily for arthritis
A patient on long-term prednisone 20 mg/day for rheumatoid arthritis (Correct answer)

Correct answer: A patient on long-term prednisone 20 mg/day for rheumatoid arthritis

Long-term systemic corticosteroid use suppresses the HPA axis, impairing the adrenal glands' ability to increase cortisol output in response to surgical stress.

Question 63: Which instrument adaptation technique places the terminal 1–2 mm of a curette against the tooth surface?

Toe-third adaptation (Correct answer)
Grasp adaptation
Fulcrum adaptation
Lateral pressure

Correct answer: Toe-third adaptation

Toe-third (or terminal third) adaptation ensures only the working end tip contacts the tooth to prevent soft tissue trauma.

Question 64: A patient presents with 6 mm pockets on the mesial surfaces of molars with bleeding on probing. The tissue appears fibrotic. Which statement is TRUE regarding instrumentation?

Fibrotic tissue will bleed more profusely than inflamed tissue during scaling
Fibrosis indicates the tissue has healed and no scaling is needed
Fibrotic pockets always require surgical intervention before scaling
Fibrotic tissue may mask true pocket depth and resist retraction, complicating instrument access (Correct answer)

Correct answer: Fibrotic tissue may mask true pocket depth and resist retraction, complicating instrument access

Fibrotic tissue is dense and firm, which can limit visibility and instrument access while still harboring pathogenic biofilm.

Question 65: At what depth should chest compressions be performed on an adult patient during CPR according to current AHA guidelines?

At least 2 inches (5 cm), not exceeding 2.4 inches (6 cm) (Correct answer)
1–1.5 inches (2.5–3.8 cm)
3 inches (7.6 cm)
As deep as needed to feel a pulse

Correct answer: At least 2 inches (5 cm), not exceeding 2.4 inches (6 cm)

AHA guidelines specify chest compressions of at least 2 inches (5 cm) but no more than 2.4 inches (6 cm) to optimize cardiac output without causing injury.

Question 66: The lingual nerve provides general sensory innervation to which area?

The entire tongue and floor of the mouth
Anterior two-thirds of the tongue and floor of the mouth (Correct answer)
Posterior tongue and pharynx only
Posterior one-third of the tongue only

Correct answer: Anterior two-thirds of the tongue and floor of the mouth

The lingual nerve (a branch of V3) provides general sensation to the anterior two-thirds of the tongue and the floor of the mouth; the chorda tympani joins it to carry taste from the same region.

Question 67: Environmental surface disinfectants used in dentistry must be EPA-registered as:

Food-safe sanitizers
Antiseptics
Hospital disinfectants (Correct answer)
Sterile solutions

Correct answer: Hospital disinfectants

The CDC recommends EPA-registered hospital disinfectants for decontamination of clinical contact surfaces in dental settings.

Question 68: A patient with a history of angina asks if their nitroglycerin spray is still effective for use in an emergency. What is the shelf life of nitroglycerin tablets once opened?

2 years
1 year
3 months
6 months (Correct answer)

Correct answer: 6 months

Nitroglycerin tablets lose potency rapidly once the bottle is opened, with an effective shelf life of approximately 6 months due to volatility of the active compound.

Question 69: Which furcation classification indicates that a furcation can be completely negotiated by a probe through to the opposite side?

Class III (Correct answer)
Class II
Class IV
Class I

Correct answer: Class III

Class III furcation involvement means the probe passes completely through the furcation from one side to the other.

Question 70: Latex hypersensitivity in dental patients is best managed by:

Using latex-free gloves and latex-free equipment throughout treatment (Correct answer)
Pre-medicating the patient with antihistamines only
Scheduling the patient as the last appointment of the day
Using low-allergen powdered latex gloves

Correct answer: Using latex-free gloves and latex-free equipment throughout treatment

Latex-allergic patients require a completely latex-free environment, including gloves, dams, and any other latex-containing materials.

Question 71: Bulimia nervosa patients frequently present with which characteristic dental finding caused by repeated gastric acid exposure?

Generalized tetracycline staining
Perimylolysis (erosion on palatal surfaces of maxillary anterior teeth) (Correct answer)
Cervical abrasion
Enamel fluorosis

Correct answer: Perimylolysis (erosion on palatal surfaces of maxillary anterior teeth)

Recurrent self-induced vomiting exposes the palatal surfaces of upper anterior teeth to gastric acid, causing a smooth, glossy erosion pattern called perimylolysis.

Question 72: A patient with a pacemaker is scheduled for periodontal debridement. Which instrument type requires SPECIAL CAUTION?

Hand curettes
Periodontal files
Piezoelectric ultrasonic scalers
Magnetostrictive ultrasonic scalers (Correct answer)

Correct answer: Magnetostrictive ultrasonic scalers

Magnetostrictive ultrasonic units generate an electromagnetic field that can potentially interfere with older pacemakers.

Question 73: Which of the following medications most commonly causes gingival enlargement that would be identified during a periodontal assessment?

Atorvastatin
Metformin
Amlodipine (calcium channel blocker) (Correct answer)
Lisinopril (ACE inhibitor)

Correct answer: Amlodipine (calcium channel blocker)

Calcium channel blockers such as amlodipine are among the drug classes most associated with drug-influenced gingival enlargement.

Question 74: What does the term 'coefficient of thermal expansion' mean in the context of dental restorations?

Rate at which the material dissolves in oral fluids
Temperature at which the material begins to soften
Change in material volume per unit temperature change (Correct answer)
Ability of material to absorb thermal shocks without fracturing

Correct answer: Change in material volume per unit temperature change

The coefficient of thermal expansion measures how much a material expands or contracts per degree of temperature change, and mismatch with tooth structure can cause microleakage.

Question 75: According to the CDC Guidelines for Infection Control in Dental Health-Care Settings, how often should biological indicator testing of sterilizers be performed at minimum?

Every day of use
At least weekly (Correct answer)
Monthly
After every 50 cycles

Correct answer: At least weekly

CDC recommends using biological indicators at least weekly and with every load containing implantable devices to confirm sterilizer performance.

Question 76: What is the minimum contact time required for a hospital-grade intermediate-level surface disinfectant to be effective?

The manufacturer's stated wet-contact time (Correct answer)
10 seconds
30 seconds
5 minutes always

Correct answer: The manufacturer's stated wet-contact time

The EPA-registered disinfectant must remain visibly wet on the surface for the full manufacturer-specified contact time to achieve the labeled kill claim.

Question 77: Which type of waste disposal should be done in a biohazard bag?

Sharps
Liquid
Regulated Waste
Non-sharp solid (Correct answer)

Correct answer: Non-sharp solid

Non-sharp solid regulated medical waste, such as contaminated gloves, gauze, cotton rolls, and disposable gowns, should be placed in a biohazard bag. These items are considered potentially infectious and require special handling and disposal to prevent the spread of pathogens. Sharps, liquids, and other specific regulated wastes have their own designated disposal methods, like puncture-resistant containers for sharps.

Question 78: During a routine appointment, a patient suddenly becomes rigid, loses consciousness, and begins to exhibit convulsive movements in their arms and legs. Which of the following represents the MOST appropriate management?

Attempt to restrain the patient's limbs to prevent injury.
Place a padded tongue blade in the patient's mouth to prevent them from biting their tongue.
Immediately sit the patient upright to improve breathing.
Clear the area of hazards, protect the patient's head, and time the seizure. (Correct answer)

Correct answer: Clear the area of hazards, protect the patient's head, and time the seizure.

During a tonic-clonic seizure, the primary goal is to protect the patient from injury. This involves clearing the area of any sharp or hard objects and placing something soft under their head. Nothing should be placed in the patient's mouth, and they should not be restrained, as these actions can cause injury. The patient should be gently eased to the floor, not sat upright.

Question 79: A patient is in your chair for a routine prophylaxis. You review their health history and note they are a smoker and a social alcohol drinker, but have otherwise well-controlled prehypertension. All vital signs are within normal limits. Based on the ASA Physical Status Classification System, this patient represents a:

Yellow flag, but requires significant treatment modification (ASA III)
Red flag, requiring immediate medical consult (ASA IV)
Yellow flag, proceed with caution (ASA II) (Correct answer)
Green flag for treatment (ASA I)

Correct answer: Yellow flag, proceed with caution (ASA II)

An ASA II classification is for a patient with mild systemic disease or significant health risk factors like smoking, social alcohol use, or well-controlled prehypertension. This represents a 'yellow flag,' indicating that the hygienist should proceed with caution but that major modifications to the treatment plan are not typically necessary for a routine procedure.

Question 80: The nasopalatine nerve innervates the anterior hard palate and exits through which foramen?

Incisive foramen (Correct answer)
Pterygopalatine foramen
Greater palatine foramen
Lesser palatine foramen

Correct answer: Incisive foramen

The nasopalatine nerve exits through the incisive foramen, located in the midline of the anterior hard palate just posterior to the maxillary central incisors.

Question 81: There are how many different kinds of instrument handles or ends?

four
two (Correct answer)
three
one

Correct answer: two

Dental instruments are typically designed with two working ends or a single working end and a handle. This dual-ended design allows for greater versatility and efficiency, as a single instrument can perform multiple functions or access different areas of the mouth without needing to switch tools. The two ends often feature different shapes, sizes, or angles to adapt to various anatomical structures and procedural requirements.

Question 82: During instrumentation, a hygienist is using a modified pen grasp. The middle finger's primary role in this grasp is to:

Roll the instrument handle for adaptation.
Rest lightly on the shank to guide the working-end and feel vibrations. (Correct answer)
Stabilize the hand by resting on a nearby tooth surface.
Provide the main source of lateral pressure against the tooth.

Correct answer: Rest lightly on the shank to guide the working-end and feel vibrations.

In a correct modified pen grasp, the middle finger rests lightly on the instrument shank. This placement helps to guide the working-end and enhances tactile sensitivity, allowing the clinician to feel vibrations transmitted from the working-end to the shank. The thumb and index finger hold the instrument, and the ring finger serves as the fulcrum.

Question 83: Single-use disposable items such as saliva ejectors should be discarded after each patient because they are:

Too expensive to sterilize properly
Regulated as single-use devices that cannot be reliably re-sterilized (Correct answer)
Required by manufacturer warranties to be discarded
Unable to withstand heat sterilization cycles without damage

Correct answer: Regulated as single-use devices that cannot be reliably re-sterilized

FDA regulates single-use devices; reprocessing them may compromise function, cannot guarantee sterility, and is prohibited without 510(k) clearance for reprocessing.

Question 84: When during pregnancy is the ideal time to get dental work done?

Never
Third trimester
Second trimester (Correct answer)
First trimester

Correct answer: Second trimester

The second trimester is generally considered the safest and most ideal time for routine dental treatment during pregnancy. By this stage, the risk of miscarriage has decreased, and the developing fetus is less susceptible to teratogenic effects compared to the first trimester. Additionally, the mother is typically more comfortable and less prone to nausea than in the first or third trimesters, making dental procedures more manageable.

Question 85: When performing nitrous oxide/oxygen conscious sedation, what is the recommended minimum oxygen concentration to maintain throughout the procedure?

30% (Correct answer)
20%
10%
50%

Correct answer: 30%

A minimum of 30% oxygen is maintained during nitrous oxide sedation to prevent hypoxia; room air contains 21%, so this exceeds normal atmospheric oxygen levels.

Question 86: Which item requires sterilization rather than disinfection before reuse on another patient?

Digital X-ray sensor (non-wrapped)
Dental explorer (Correct answer)
Facebow
Lead apron

Correct answer: Dental explorer

A dental explorer is a critical instrument that penetrates soft tissue, requiring sterilization between every patient use.

Question 87: A patient presents with a chief complaint of sensitivity when drinking cold water. Which assessment tool is most useful in differentiating between pulpitis and dentinal hypersensitivity?

Thermal and electric pulp testing (Correct answer)
Periodontal probing
Radiographic bone level assessment
Oral hygiene index

Correct answer: Thermal and electric pulp testing

Thermal and electric pulp vitality testing help distinguish vital tooth sensitivity (hypersensitivity) from pulpal pathology (pulpitis).

Question 88: Which carbohydrate characteristic most significantly increases cariogenic potential?

Low fermentability
High molecular weight
High frequency of consumption (Correct answer)
Low solubility

Correct answer: High frequency of consumption

Frequent sugar consumption prolongs acid exposure time on enamel, dramatically increasing caries risk more than total sugar quantity alone.

Question 89: During a medical emergency requiring 100% oxygen delivery, which delivery device provides the highest oxygen concentration?

Simple face mask at 10 L/min
Nasal cannula at 6 L/min
Non-rebreather mask at 15 L/min (Correct answer)
Venturi mask at 8 L/min

Correct answer: Non-rebreather mask at 15 L/min

A non-rebreather mask with a reservoir bag at 15 L/min delivers approximately 90-100% FiO2, making it the highest concentration non-invasive delivery device.

Question 90: A dental hygienist notices a patient's diet recall is high in citrus fruits and soda consumed throughout the day. Which oral finding is most likely?

Demineralization at contact points only
Erosion on facial and occlusal surfaces (Correct answer)
Abfraction at cervical areas
Attrition on occlusal surfaces

Correct answer: Erosion on facial and occlusal surfaces

Dietary acids from citrus and carbonated beverages cause erosion, which most commonly affects facial and occlusal surfaces exposed during drinking and eating.

Question 91: Which hepatitis virus is most commonly transmitted via contaminated dental instruments?

Hepatitis C
Hepatitis A
Hepatitis E
Hepatitis B (Correct answer)

Correct answer: Hepatitis B

Hepatitis B virus (HBV) is a primary bloodborne pathogen of concern in dentistry due to its high survival rate on surfaces and low infectious dose.

Question 92: Which bacterium is considered the primary etiologic agent of localized aggressive periodontitis (now classified as Stage III/IV Grade C in young patients)?

Aggregatibacter actinomycetemcomitans (Correct answer)
Tannerella forsythia
Fusobacterium nucleatum
Porphyromonas gingivalis

Correct answer: Aggregatibacter actinomycetemcomitans

Aggregatibacter actinomycetemcomitans (Aa) produces leukotoxin and is classically associated with localized aggressive periodontitis in young patients.

Question 93: The correct angulation of a curette blade to the tooth surface during the working stroke for scaling is:

0–30 degrees
30–45 degrees
90–120 degrees
45–90 degrees (Correct answer)

Correct answer: 45–90 degrees

A 45–90 degree angulation between the blade face and tooth surface is required for effective scaling.

Question 94: The primary reason for using a modified pen grasp during periodontal instrumentation is to:

Prevent carpal tunnel syndrome by reducing wrist movement
Allow use of both cutting edges of universal curettes simultaneously
Provide tactile sensitivity and controlled lateral pressure (Correct answer)
Increase grip strength for heavy calculus removal

Correct answer: Provide tactile sensitivity and controlled lateral pressure

The modified pen grasp distributes grip across three fingers, enhancing tactile feedback and precise control of lateral pressure.

Question 95: Which type of radiation has the HIGHEST energy in dental radiography?

Infrared rays
X-rays (Correct answer)
Visible light
Radio waves

Correct answer: X-rays

X-rays used in dental radiography have very short wavelengths and high energy, allowing them to penetrate soft and hard tissues.

Question 96: Which type of epithelium lines the oral mucosa of the hard palate?

Pseudostratified ciliated
Simple cuboidal
Simple columnar
Stratified squamous keratinized (Correct answer)

Correct answer: Stratified squamous keratinized

The hard palate is covered by stratified squamous keratinized epithelium, which withstands the mechanical stress of chewing.

Question 97: Which muscle forms the muscular floor of the oral cavity, creating a sling between the two sides of the mandible?

Digastric
Stylohyoid
Geniohyoid
Mylohyoid (Correct answer)

Correct answer: Mylohyoid

The mylohyoid muscle forms the primary muscular floor of the oral cavity, attaching along the mylohyoid line on the inner surface of the mandible and meeting at a median raphe.

Question 98: A dental hygienist is performing periodontal debridement on the facial aspect of tooth #30. To effectively remove a tenacious, sheet-like piece of subgingival calculus, which type of instrumentation stroke is most appropriate to initiate the removal process?

A single, long, continuous vertical stroke from the base of the pocket coronally.
A series of short, overlapping, horizontal strokes starting from the side edge of the deposit. (Correct answer)
A push stroke directed apically to dislodge the calculus from the root surface.
A light, sweeping oblique stroke across the entire deposit to smooth it.

Correct answer: A series of short, overlapping, horizontal strokes starting from the side edge of the deposit.

For tenacious or burnished calculus, using short, overlapping horizontal strokes starting from the edge of the deposit helps to break up the calculus into smaller, more manageable pieces for removal. A long vertical stroke may not engage the edge of the deposit effectively, and a light or push stroke would be ineffective and could even burnish the calculus further.

Question 99: What is the term for the distance from the cementoenamel junction (CEJ) to the base of the sulcus/pocket measured clinically?

Osseous crest depth
Biologic width
Attachment level (Correct answer)
Probing depth

Correct answer: Attachment level

Clinical attachment level (CAL) is measured from the CEJ to the base of the pocket and reflects true tissue destruction regardless of gingival position.

Question 100: Which instrument is used to measure probing depth during a periodontal assessment?

Periodontal probe (Correct answer)
Curette
Scaler
Explorer

Correct answer: Periodontal probe

The periodontal probe is calibrated in millimeters and is specifically designed to measure sulcus and pocket depth.

ADEX Dental Hygiene Exam

The ADEX Dental Hygiene Exam exam validates essential knowledge and skills required for certification or licensure in this field.

100

Questions

120 min

Time Limit

75%

To Pass

Checking for saved progress...

Exam Rules

You can skip questions and return to them later
Flag questions for review before submitting
No feedback shown until you submit the entire exam
Unanswered questions count as wrong — answer everything
10 pretest questions are mixed in and don't affect your score
Timer auto-submits when time runs out
Your progress is auto-saved every 30 seconds