Free AGD Endodontic Diagnosis and Treatment Questions and Answers — Questions and Answers
Question 1: A 35-year-old patient presents with a chief complaint of a sharp, shooting pain on tooth #19 when biting down on hard foods, which disappears immediately upon release. Cold testing elicits a brief, sharp response, but there is no lingering pain or spontaneity. Percussion and palpation are within normal limits. A periapical radiograph shows no abnormalities. A focused bite test with a Tooth Slooth on the mesiolingual cusp reproduces the sharp pain upon release. What is the most likely diagnosis?
- Reversible Pulpitis with Symptomatic Apical Periodontitis
- Symptomatic Irreversible Pulpitis
- Cracked Tooth Syndrome (Correct answer)
- Dentin Hypersensitivity
Correct answer: Cracked Tooth Syndrome
The classic sign of a cracked tooth is a sharp pain on biting, specifically upon release of biting pressure. This occurs as the crack flexes, stimulating pulpal nerve fibers. The other findings, such as a brief response to cold and absence of radiographic changes or lingering pain, are also consistent with an early-stage cracked tooth where the pulp is still vital but irritated.
Question 2: A patient presents for an emergency visit complaining of intense, spontaneous, throbbing pain in the lower right quadrant that has been waking them up at night. The pain lingers for several minutes after drinking cold water. Tooth #30 has a large carious lesion. It is severely tender to percussion. A periapical radiograph reveals a distinct widening of the periodontal ligament space around the apices. According to the American Association of Endodontists (AAE) diagnostic terminology, what is the correct pulpal and periapical diagnosis?
- Pulp Necrosis and Asymptomatic Apical Periodontitis
- Reversible Pulpitis and Normal Apical Tissues
- Symptomatic Irreversible Pulpitis and Symptomatic Apical Periodontitis (Correct answer)
- Asymptomatic Irreversible Pulpitis and Chronic Apical Abscess
Correct answer: Symptomatic Irreversible Pulpitis and Symptomatic Apical Periodontitis
Symptomatic Irreversible Pulpitis is characterized by spontaneous, lingering pain to thermal stimuli. Symptomatic Apical Periodontitis is identified by a painful response to biting or percussion, indicating inflammation has reached the apical periodontium. The radiographic widening of the PDL space corroborates the apical diagnosis.
Question 3: Which of the following is the primary objective of pulp sensibility testing, such as cold tests or the electric pulp test (EPT)?
- To determine the vascular supply (vitality) of the pulp.
- To assess the presence or absence of nerve response (sensibility) in the pulp. (Correct answer)
- To definitively distinguish between a periapical cyst and a granuloma.
- To measure the extent of bacterial invasion into the dentinal tubules.
Correct answer: To assess the presence or absence of nerve response (sensibility) in the pulp.
Pulp sensibility tests, including thermal and electric tests, assess the response of pulpal nerves to a stimulus. A response indicates that the nerve fibers are functional. These tests do not directly measure blood flow, which is the true definition of vitality. Therefore, they test for 'sensibility,' not 'vitality.'
Question 4: A patient has a non-vital maxillary central incisor with a large, well-defined periapical radiolucency. There is a history of trauma from 10 years prior. The tooth is asymptomatic and not tender to percussion or palpation. A sinus tract is present on the facial gingiva, which traces back to the apex of the incisor. What are the most likely pulpal and periapical diagnoses?
- Previously Treated and Symptomatic Apical Periodontitis
- Pulp Necrosis and Chronic Apical Abscess (Correct answer)
- Symptomatic Irreversible Pulpitis and Acute Apical Abscess
- Normal Pulp and Asymptomatic Apical Periodontitis
Correct answer: Pulp Necrosis and Chronic Apical Abscess
The pulp is non-responsive, indicating Pulp Necrosis. A chronic apical abscess is characterized by a gradual onset, little to no discomfort, and the intermittent discharge of pus through an associated sinus tract, which is consistent with the clinical findings.
Question 5: When diagnosing a primary endodontic lesion with secondary periodontal involvement, what is the typical initial treatment sequence that offers the best prognosis?
- Perform periodontal surgery first, followed by root canal therapy after 3 months.
- Extract the tooth as combined lesions have a hopeless prognosis.
- Initiate root canal therapy first, then re-evaluate the periodontal condition after a healing period. (Correct answer)
- Prescribe systemic antibiotics for one week, followed by simultaneous endodontic and periodontal treatment.
Correct answer: Initiate root canal therapy first, then re-evaluate the periodontal condition after a healing period.
For a primary endodontic lesion that has caused secondary periodontal breakdown, the source of the infection is pulpal. Therefore, eliminating the endodontic infection through root canal therapy is the first and most critical step. Often, the periodontal component will show significant healing once the endodontic cause is resolved. Periodontal therapy is addressed later if needed.
Question 6: Radiographically, which feature is traditionally considered more suggestive of a periapical cyst rather than a periapical granuloma, although it is not a definitive diagnostic criterion?
- A small, diffuse radiolucency with ill-defined borders.
- A large (>1 cm), well-circumscribed radiolucency with a distinct corticated border. (Correct answer)
- A radiopacity surrounding the apex, consistent with condensing osteitis.
- Evidence of external root resorption on the associated tooth.
Correct answer: A large (>1 cm), well-circumscribed radiolucency with a distinct corticated border.
While definitive diagnosis requires histopathology, a large, well-defined, 'hydraulic-appearing' radiolucency with a sclerotic or corticated border is classically more indicative of a periapical (radicular) cyst. Granulomas are more often smaller and have less distinct borders. However, this is a general guideline and not a definitive rule.
Free AGD Endodontic Diagnosis and Treatment Questions and Answers
A 35-year-old patient presents with a chief complaint of a sharp, shooting pain on tooth #19 when biting down on hard foods, which disappears immediately upon release.
Cold testing elicits a brief, sharp response, but there is no lingering pain or spontaneity.
Percussion and palpation are within normal limits.
A periapical radiograph shows no abnormalities.
A focused bite test with a Tooth Slooth on the mesiolingual cusp reproduces the sharp pain upon release.
What is the most likely diagnosis?