Practice Test GeeksNBDE - National Board Dental Examination Practice Test
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Part II Flashcards

7 cards from real NBDE practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.

Read the first 7 Part II flashcards as text

  1. During endodontic treatment of a maxillary first molar, which root canal is MOST likely to have a second canal?

    Answer: Mesiobuccal root

    The mesiobuccal root of the maxillary first molar has a second canal (MB2) in approximately 60–95% of cases and is clinically the most commonly missed canal.

  2. Which material is contraindicated as a base under composite resin restorations due to inhibition of polymerization?

    Answer: Zinc oxide eugenol (ZOE)

    Eugenol from ZOE inhibits the free-radical polymerization of composite resins, leading to a soft, unset surface layer at the interface.

  3. A patient presents with a chief complaint of pain in the upper left quadrant. On examination, tooth #14 is non-vital, has a sinus tract, and shows a periapical radiolucency. The sinus tract most likely originates from:

    Answer: Cannot be determined without a GP trace

    Placing a gutta-percha point into the sinus tract and tracing it radiographically is the definitive method to identify the exact origin of the sinus tract.

  4. The maximum recommended dose of lidocaine with epinephrine for a healthy 70 kg adult patient is approximately:

    Answer: 500 mg

    The maximum dose of lidocaine with epinephrine is 7 mg/kg with an absolute maximum of 500 mg in a healthy adult.

  5. Which of the following is the primary reason for placing a rubber dam during endodontic treatment?

    Answer: To prevent salivary contamination of the root canal system

    Rubber dam isolation is mandatory in endodontics primarily to prevent microbial contamination of the canal from saliva, which would compromise treatment outcomes.

  6. A 30-year-old presents with 6 mm attachment loss in the anterior region and no pocketing. This patient most likely has:

    Answer: Gingival recession with no periodontitis

    Attachment loss without pocketing indicates that the gingival margin has receded apically, exposing root surface without a pathologic pocket.

  7. Which occlusal scheme is most appropriate for a fully balanced complete denture?

    Answer: Lingualized occlusion

    Lingualized occlusion provides bilateral balance during excursive movements while reducing lateral forces on the denture base, making it the preferred scheme for complete dentures.