AGD Endodontics and Pulpal Therapy Questions and Answers — Questions and Answers
Question 1: A 9-year-old patient presents with a deep carious lesion on tooth #8, a permanent incisor with an open apex. A small, vital pulp exposure occurred during caries excavation. The pulp is asymptomatic and shows normal responsiveness to cold testing. Which procedure is most appropriate to encourage continued physiological root development?
- Pulpotomy with formocresol
- Apexification
- Apexogenesis (Correct answer)
- Conventional root canal therapy
Correct answer: Apexogenesis
Apexogenesis is the treatment of choice for a vital, exposed pulp in an immature permanent tooth with an open apex. This vital pulp therapy aims to preserve the vitality of the radicular pulp, allowing for the continued natural formation of the root length and apical closure. Apexification is indicated for non-vital immature teeth. A formocresol pulpotomy is not the standard of care for permanent teeth, and conventional root canal therapy is not feasible until the apex is closed.
Question 2: A patient presents with sharp, fleeting pain on tooth #14 when drinking cold liquids. The pain subsides immediately upon removal of the stimulus. There is a deep amalgam restoration with a suspected open margin, but no spontaneous pain or pain on percussion. What is the most likely pulpal diagnosis?
- Irreversible pulpitis
- Normal pulp
- Pulpal necrosis
- Reversible pulpitis (Correct answer)
Correct answer: Reversible pulpitis
Reversible pulpitis is characterized by a sharp, non-lingering pain in response to a stimulus, such as cold or sweets, that resolves quickly after the stimulus is removed. Irreversible pulpitis typically involves lingering or spontaneous pain. Pulpal necrosis would not respond to cold stimuli. A normal pulp would not exhibit this level of sensitivity.
Question 3: According to the International Association of Dental Traumatology (IADT) guidelines for an avulsed permanent tooth with a closed apex that has been replanted after 65 minutes of dry time, which of the following is an essential step in the management plan?
- Initiate root canal therapy within 7-10 days. (Correct answer)
- Splint the tooth rigidly for 4-6 weeks.
- Scrub the root surface with a brush before replantation.
- Delay root canal treatment indefinitely to observe for pulpal revascularization.
Correct answer: Initiate root canal therapy within 7-10 days.
For an avulsed tooth with a closed apex and an extra-oral dry time exceeding 60 minutes, the periodontal ligament cells are considered non-viable, and pulp necrosis is inevitable. The IADT guidelines recommend initiating root canal treatment 7-10 days after replantation to prevent infection-related resorption. Splinting should be flexible and for a short duration (up to 2 weeks). The root surface should not be scrubbed, and pulpal revascularization is not expected in a tooth with a closed apex.
Question 4: When performing a direct pulp cap on a permanent molar, which material has demonstrated a higher long-term success rate in maintaining pulp vitality and promoting the formation of a more predictable, high-quality dentin bridge compared to calcium hydroxide?
- Zinc Oxide Eugenol (ZOE)
- Glass Ionomer Cement
- Mineral Trioxide Aggregate (MTA) (Correct answer)
- Resin-Modified Glass Ionomer (RMGI)
Correct answer: Mineral Trioxide Aggregate (MTA)
Multiple studies and clinical trials have shown that Mineral Trioxide Aggregate (MTA) has a significantly higher success rate than calcium hydroxide for direct pulp capping in permanent teeth. MTA is less toxic to the pulp, causes less inflammation, and leads to the formation of a more predictable and complete hard tissue barrier, thereby improving long-term pulp vitality.
Question 5: A patient presents with a history of spontaneous, throbbing pain in the lower right quadrant that worsens when they lie down. Clinical testing reveals no response to cold or electric pulp testing on tooth #30, and the tooth is tender to percussion and palpation. This clinical presentation is most consistent with which pulpal and periapical diagnosis?
- Reversible Pulpitis and Normal Apical Tissues
- Irreversible Pulpitis and Acute Apical Abscess
- Pulpal Necrosis and Symptomatic Apical Periodontitis (Correct answer)
- Irreversible Pulpitis and Asymptomatic Apical Periodontitis
Correct answer: Pulpal Necrosis and Symptomatic Apical Periodontitis
The lack of response to vitality testing (cold and EPT) indicates the pulp is necrotic. The tenderness to percussion and palpation, along with a history of spontaneous pain, points to inflammation in the periapical tissues, making 'Symptomatic Apical Periodontitis' the correct periapical diagnosis. An abscess would typically present with swelling.
Question 6: Which of the following endodontic sealers is known for its excellent biocompatibility, ability to set in the presence of moisture, and bioactive potential to stimulate hard tissue formation, but may have lower antibacterial properties compared to traditional zinc oxide-eugenol sealers?
- Epoxy resin-based sealer
- Bioceramic (calcium silicate-based) sealer (Correct answer)
- Zinc oxide-eugenol (ZOE) based sealer
- Calcium hydroxide-based sealer
Correct answer: Bioceramic (calcium silicate-based) sealer
Bioceramic (calcium silicate-based) sealers are hydrophilic, meaning they set in the presence of moisture. They are highly biocompatible and bioactive, releasing calcium hydroxide which can stimulate hard tissue repair. While they possess some antimicrobial properties due to their high pH, some studies suggest traditional ZOE-based sealers may exhibit stronger initial antibacterial activity. Epoxy resin sealers are known for their sealing ability but are not considered bioactive.
AGD Endodontics and Pulpal Therapy Questions and Answers
A 9-year-old patient presents with a deep carious lesion on tooth #8, a permanent incisor with an open apex.
A small, vital pulp exposure occurred during caries excavation.
The pulp is asymptomatic and shows normal responsiveness to cold testing.
Which procedure is most appropriate to encourage continued physiological root development?