AGD Endodontics and Pulpal Therapy 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?

Accepted Answer

Apexogenesis

Answer

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?

Accepted Answer

Reversible pulpitis

Answer

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?

Accepted Answer

Initiate root canal therapy within 7-10 days.

Answer

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?

Accepted Answer

Mineral Trioxide Aggregate (MTA)

Answer

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?

Accepted Answer

Pulpal Necrosis and Symptomatic Apical Periodontitis

Answer

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.

(AGD) Academy of General Dentistry Certification Practice Test

(AGD) Academy of General Dentistry Certification Practice Test

AGD Endodontics and Pulpal Therapy Questions and Answers