NBDE: Dental Anatomy UPDATED
ACTUAL Exam Questions and CORRECT
Answers
Cleft Lip and Palate - CORRECT ANSWER - This is the effect of the tetratogens aspirin,
valium, dilantin, and cigarette smoke in infants.
Cytomegalovirus and Toxoplasma - CORRECT ANSWER - These two tetratogens cause
microcephaly, hydrocephaly, and microphthalmia in infants.
Ethyl Alcohol - CORRECT ANSWER - This tetratogen causes central mid-face
discrepancy in infants.
Rubella - CORRECT ANSWER - This tetratogen causes microphthalmia, cataracts and
deafness in infants.
X-radiation - CORRECT ANSWER - This tetratogen causes microcephaly in infants.
Vitamin D - CORRECT ANSWER - Excess of this tetratogen causes premature suture
closure in infants.
Cell-Free Zone (Zone of Weil) - CORRECT ANSWER - This area of dental pulp lies
directly subadjacent to the odontogenic zone; contains numerous bundles of Korff's reticular
fibers which extend into the dentinal layer; also contains many capillaries and nerves.
Cell-Rich Zone - CORRECT ANSWER - This area of dental pulp contains numerous
fibroblasts, undifferentiated mesenchymal cells which can differentiate into odontoblasts,
lymphocytes, plasma cells and eosinophils.
Pulp - CORRECT ANSWER - This tooth layer contains the subodontoblastic plexus of
Raschkow at its innermost part.
, Tomes' Process - CORRECT ANSWER - This is the secretory surface of the ameloblast
that faces the DEJ.
Tomes' Fibers - CORRECT ANSWER - These are the cytoplastic cell processes of
odontoblasts; one is contained in each dentinal tubule.
Amelogenesis - CORRECT ANSWER - This process begins right after the initiation of
dentinogenesis and includes the stages presecretory, secretory, transitional, maturation and post-
maturational.
Unmyelinated - CORRECT ANSWER - Sympathetic autonomic nerve fibers which enter
the apex of a tooth extend from cell bodies in the superior cervical ganglion at the base of the
skull with blood vessels and are (myelinated/unmyelinated); they innervate smooth muscle cells
of the arterioles to regulate blood flow in the capillay network.
Myelinated - CORRECT ANSWER - Afferent sensory fibers which enter the apex of the
tooth arise in the maxillary and mandibular branches CN V and are predominantly
(myelinated/unmyelinated); they may terminate in the central pulp or send small individual fibers
that form the subodontoblastic plexus of Raschkow.
Enamel - CORRECT ANSWER - Lines of Retzius are the incremental lines on
(enamel/dentin/cementum/pulp)
Dentin - CORRECT ANSWER - Imbrication lines of von Ebner are the incremental lines
on (enamel/denin/cementul/pulp)
Arrest and Reversal - CORRECT ANSWER - These two lines represent the incremental
lines on both cementum and alveolar bone
Odontoclasts - CORRECT ANSWER - These cells are the resorptive cells of both enamel
and dentin.
ACTUAL Exam Questions and CORRECT
Answers
Cleft Lip and Palate - CORRECT ANSWER - This is the effect of the tetratogens aspirin,
valium, dilantin, and cigarette smoke in infants.
Cytomegalovirus and Toxoplasma - CORRECT ANSWER - These two tetratogens cause
microcephaly, hydrocephaly, and microphthalmia in infants.
Ethyl Alcohol - CORRECT ANSWER - This tetratogen causes central mid-face
discrepancy in infants.
Rubella - CORRECT ANSWER - This tetratogen causes microphthalmia, cataracts and
deafness in infants.
X-radiation - CORRECT ANSWER - This tetratogen causes microcephaly in infants.
Vitamin D - CORRECT ANSWER - Excess of this tetratogen causes premature suture
closure in infants.
Cell-Free Zone (Zone of Weil) - CORRECT ANSWER - This area of dental pulp lies
directly subadjacent to the odontogenic zone; contains numerous bundles of Korff's reticular
fibers which extend into the dentinal layer; also contains many capillaries and nerves.
Cell-Rich Zone - CORRECT ANSWER - This area of dental pulp contains numerous
fibroblasts, undifferentiated mesenchymal cells which can differentiate into odontoblasts,
lymphocytes, plasma cells and eosinophils.
Pulp - CORRECT ANSWER - This tooth layer contains the subodontoblastic plexus of
Raschkow at its innermost part.
, Tomes' Process - CORRECT ANSWER - This is the secretory surface of the ameloblast
that faces the DEJ.
Tomes' Fibers - CORRECT ANSWER - These are the cytoplastic cell processes of
odontoblasts; one is contained in each dentinal tubule.
Amelogenesis - CORRECT ANSWER - This process begins right after the initiation of
dentinogenesis and includes the stages presecretory, secretory, transitional, maturation and post-
maturational.
Unmyelinated - CORRECT ANSWER - Sympathetic autonomic nerve fibers which enter
the apex of a tooth extend from cell bodies in the superior cervical ganglion at the base of the
skull with blood vessels and are (myelinated/unmyelinated); they innervate smooth muscle cells
of the arterioles to regulate blood flow in the capillay network.
Myelinated - CORRECT ANSWER - Afferent sensory fibers which enter the apex of the
tooth arise in the maxillary and mandibular branches CN V and are predominantly
(myelinated/unmyelinated); they may terminate in the central pulp or send small individual fibers
that form the subodontoblastic plexus of Raschkow.
Enamel - CORRECT ANSWER - Lines of Retzius are the incremental lines on
(enamel/dentin/cementum/pulp)
Dentin - CORRECT ANSWER - Imbrication lines of von Ebner are the incremental lines
on (enamel/denin/cementul/pulp)
Arrest and Reversal - CORRECT ANSWER - These two lines represent the incremental
lines on both cementum and alveolar bone
Odontoclasts - CORRECT ANSWER - These cells are the resorptive cells of both enamel
and dentin.
