Practice Test GeeksNBDE - National Board Dental Examination Practice Test
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MCQ 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 MCQ flashcards as text

  1. Which nerve provides sensory innervation to the anterior two-thirds of the tongue?

    Answer: Lingual nerve (branch of CN V3)

    The lingual nerve, a branch of the mandibular division of the trigeminal nerve, carries general somatic afferent (touch, pain, temperature) information from the anterior two-thirds of the tongue.

  2. Nitrous oxide exerts its analgesic effect primarily through:

    Answer: NMDA receptor antagonism

    Nitrous oxide produces analgesia mainly by antagonizing NMDA (N-methyl-D-aspartate) glutamate receptors, reducing pain signal transmission in the CNS.

  3. Which radiographic technique minimizes distortion and projects teeth at their true length?

    Answer: Paralleling technique

    The paralleling technique places the film parallel to the tooth's long axis with the central ray perpendicular to both, producing minimal geometric distortion.

  4. In the formation of dentin, which organic component constitutes approximately 90% of dentin matrix?

    Answer: Type I collagen

    Type I collagen comprises approximately 90% of dentin's organic matrix, providing the scaffold upon which hydroxyapatite crystals are deposited.

  5. A patient on warfarin therapy requires a routine extraction. The INR result is 3.8. The appropriate course of action is:

    Answer: Postpone and consult physician to adjust anticoagulation

    An INR of 3.8 is above the safe threshold of 3.5 for dental extractions; elective procedures should be postponed and the physician consulted to adjust dosing.

  6. Which of the following is the FIRST sign of local anesthetic toxicity affecting the CNS?

    Answer: Circumoral numbness and lightheadedness

    Early CNS excitatory signs of local anesthetic toxicity include circumoral numbness, tingling, lightheadedness, and tinnitus before progression to seizures.

  7. The Angle Class II, Division 2 malocclusion is characterized by:

    Answer: Distally positioned mandibular first molar with retroclined maxillary central incisors

    Class II Division 2 features a distal molar relationship (Class II) with retroclined (lingually inclined) maxillary central incisors and often proclined lateral incisors.