Practice Test GeeksNBDE - National Board Dental Examination Practice Test
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Ultimate 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.

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  1. Which nerve provides general somatic afferent (taste-independent sensory) innervation to the anterior two-thirds of the tongue?

    Answer: Lingual nerve (branch of CN V3)

    The lingual nerve (a branch of the inferior alveolar nerve from V3) carries general sensation from the anterior two-thirds of the tongue; taste is carried by the chorda tympani.

  2. Which major salivary gland produces an almost entirely serous secretion?

    Answer: Parotid gland

    The parotid gland is composed almost exclusively of serous acini, producing watery, enzyme-rich saliva, including amylase.

  3. The correct chemical formula for hydroxyapatite, the principal mineral of enamel and bone, is:

    Answer: Ca10(PO4)6(OH)2

    Hydroxyapatite has the formula Ca10(PO4)6(OH)2 and constitutes approximately 96% of mature enamel by weight.

  4. Hertwig's epithelial root sheath (HERS), which dictates root morphology and initiates cementogenesis, is derived from:

    Answer: Inner and outer enamel epithelium at the cervical loop

    HERS forms from the proliferation and fusion of the inner and outer enamel epithelium at the cervical loop, growing apically to shape the root.

  5. The inferior alveolar nerve, after supplying the mandibular teeth, exits the mandible as the mental nerve through the:

    Answer: Mental foramen

    The terminal branch of the inferior alveolar nerve exits the mental foramen (typically between the premolar apices) as the mental nerve, supplying the chin and lower lip.

  6. Which type of collagen is the predominant collagen in the periodontal ligament (PDL)?

    Answer: Type I collagen

    Type I collagen constitutes approximately 74% of total PDL collagen and forms the principal Sharpey's fibers that anchor the tooth to alveolar bone.

  7. During glycolysis, glucose is first phosphorylated to glucose-6-phosphate by which enzyme?

    Answer: Hexokinase

    Hexokinase (or glucokinase in hepatocytes) catalyzes the first committed step of glycolysis, phosphorylating glucose to glucose-6-phosphate using one ATP.