FREE DMD Periodontics and Endodontics Questions and Answers

Question 1

A 22-year-old systemically healthy female presents with severe, angular bone loss localized to the maxillary first molars and mandibular incisors, discovered on routine radiographs.
Clinical examination reveals 7-8 mm probing depths in these areas, but surprisingly minimal plaque and calculus accumulation.
What is the most likely diagnosis?

Accepted Answer

Localized Aggressive Periodontitis

Answer

Chronic Periodontitis

Answer

Necrotizing Ulcerative Periodontitis (NUP)

Answer

Periodontitis as a manifestation of systemic disease

Question 2

A patient presents with a deep, isolated 9mm periodontal pocket on the facial aspect of tooth #22. Pulp vitality testing reveals no response to cold or electric stimuli. A radiograph shows a J-shaped radiolucency extending from the apex to the mid-root. Based on Simon's classification, what is the most likely diagnosis?

Accepted Answer

Primary endodontic lesion with secondary periodontal involvement

Answer

Primary periodontal lesion with secondary endodontic involvement

Answer

True combined endo-perio lesion

Answer

Vertical root fracture

Question 3

The primary principle of Guided Tissue Regeneration (GTR) using a barrier membrane in treating an intrabony periodontal defect is to:

Accepted Answer

Exclude gingival epithelium and connective tissue from the root surface to allow for repopulation by PDL and bone cells.

Answer

Provide a scaffold for bone graft material to enhance stability.

Answer

Deliver concentrated growth factors to the surgical site.

Answer

Prevent the apical migration of the junctional epithelium.

Question 4

A patient complains of a sharp pain on tooth #14, specifically upon releasing pressure after biting down on something hard. The pain is momentary and difficult to pinpoint. Probing depths are within normal limits, and the tooth responds normally to thermal pulp testing. Which diagnosis is most probable?

Accepted Answer

Cracked Tooth Syndrome

Answer

Reversible Pulpitis

Answer

Vertical Root Fracture

Answer

Acute Apical Periodontitis

Question 5

Mineral Trioxide Aggregate (MTA) is a biocompatible material frequently used for perforation repairs and apexification. What is its primary chemical component, which is also found in Portland cement?

Accepted Answer

Tricalcium silicate

Answer

Calcium hydroxide

Answer

Bismuth oxide

Answer

Zinc oxide

Question 6

Which of the following represents the primary therapeutic goal of non-surgical periodontal therapy, also known as Phase I therapy?

Accepted Answer

To remove microbial biofilm and calculus to reduce inflammation.

Answer

To regenerate lost alveolar bone and cementum.

Answer

To perform definitive occlusal adjustments.

Answer

To prepare teeth for final prosthetic restorations.