NBDE: Dental Anatomy Exam 2025
Questions and Answers
Cleft Lip and Palate - ANSWER✔✔-This is the effect of the tetratogens aspirin, valium,
dilantin, and cigarette smoke in infants.
Cytomegalovirus and Toxoplasma - ANSWER✔✔-These two tetratogens cause
microcephaly, hydrocephaly, and microphthalmia in infants.
Ethyl Alcohol - ANSWER✔✔-This tetratogen causes central mid-face discrepancy in
infants.
Rubella - ANSWER✔✔-This tetratogen causes microphthalmia, cataracts and deafness
in infants.
X-radiation - ANSWER✔✔-This tetratogen causes microcephaly in infants.
Vitamin D - ANSWER✔✔-Excess of this tetratogen causes premature suture closure in
infants.
, Cell-Free Zone (Zone of Weil) - 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 - ANSWER✔✔-This area of dental pulp contains numerous fibroblasts,
undifferentiated mesenchymal cells which can differentiate into odontoblasts,
lymphocytes, plasma cells and eosinophils.
Pulp - ANSWER✔✔-This tooth layer contains the subodontoblastic plexus of Raschkow
at its innermost part.
Tomes' Process - ANSWER✔✔-This is the secretory surface of the ameloblast that faces
the DEJ.
Tomes' Fibers - ANSWER✔✔-These are the cytoplastic cell processes of odontoblasts;
one is contained in each dentinal tubule.
Amelogenesis - ANSWER✔✔-This process begins right after the initiation of
dentinogenesis and includes the stages presecretory, secretory, transitional, maturation
and post-maturational.
Unmyelinated - 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.
Questions and Answers
Cleft Lip and Palate - ANSWER✔✔-This is the effect of the tetratogens aspirin, valium,
dilantin, and cigarette smoke in infants.
Cytomegalovirus and Toxoplasma - ANSWER✔✔-These two tetratogens cause
microcephaly, hydrocephaly, and microphthalmia in infants.
Ethyl Alcohol - ANSWER✔✔-This tetratogen causes central mid-face discrepancy in
infants.
Rubella - ANSWER✔✔-This tetratogen causes microphthalmia, cataracts and deafness
in infants.
X-radiation - ANSWER✔✔-This tetratogen causes microcephaly in infants.
Vitamin D - ANSWER✔✔-Excess of this tetratogen causes premature suture closure in
infants.
, Cell-Free Zone (Zone of Weil) - 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 - ANSWER✔✔-This area of dental pulp contains numerous fibroblasts,
undifferentiated mesenchymal cells which can differentiate into odontoblasts,
lymphocytes, plasma cells and eosinophils.
Pulp - ANSWER✔✔-This tooth layer contains the subodontoblastic plexus of Raschkow
at its innermost part.
Tomes' Process - ANSWER✔✔-This is the secretory surface of the ameloblast that faces
the DEJ.
Tomes' Fibers - ANSWER✔✔-These are the cytoplastic cell processes of odontoblasts;
one is contained in each dentinal tubule.
Amelogenesis - ANSWER✔✔-This process begins right after the initiation of
dentinogenesis and includes the stages presecretory, secretory, transitional, maturation
and post-maturational.
Unmyelinated - 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.
