TCDHA HISTOLOGY EXAM SCRIPT
UPDATED COMPLETE QUESTIONS AND
ANSWERS GRADED APLUS
●● amelogenesis
Answer: process of enamel matrix formation and mineralization
occurs during appositional stage
DENTIN MUST BE PRESENT
●● enamel is first formed in
Answer: cusp/tip area of tooth
●● ameloblasts
Answer: produce enamel matrix
develop on inner surface of enamel organ (IEE)
cause outer cells of dental papilla to become odontoblasts
,●● tomes process
Answer: secretes enamel matrix
●● enamel pearl
Answer: small spherical enamel projections on root surface
●● enamel dysplasia
Answer: faulty development of enamel
●● deepened pits and fissures
Answer: common
when ameloblasts back into one another during apposition
larger areas for dental caries
●● sealants
Answer: used in prevention of caries
●● Mineralization
Answer: complete and immediate
,ameloblasts actively pump calcium hydroxyapatite into forming enamel
matrix as it is secreted by tomes process
●● enamel rod
Answer: structural unit of enamel
key hole shaped
rods are aligned DEJ except in cervical regions of permanent teeth
●● lines of retzius
Answer: seen with transmitted light
represent incremental growth lines that extend from DEJ
●● neonatal lline
Answer: a pronounced line of Retzius marked by stress/trauma
experienced by ameloblasts during birth
●● nasmyths membrane
Answer: primary enamel cuticle
delicate membrane covers entire crown of newly erupted tooth
, green or yellow- easily worn away
●● hunter-schreger bands
Answer: seen with reflected light
change in direction from prism to next
originate from DEJ- run perpendicular to lines of retzius
strength against force
●● perikymata
Answer: external manifestation of line of retzius
raised grooves on enamel surface
●● enamel spindles
Answer: dentinal tubules that pass across DEJ into enamel and bcome
trapped
found beneath cusps and incisal tips of teeth
UPDATED COMPLETE QUESTIONS AND
ANSWERS GRADED APLUS
●● amelogenesis
Answer: process of enamel matrix formation and mineralization
occurs during appositional stage
DENTIN MUST BE PRESENT
●● enamel is first formed in
Answer: cusp/tip area of tooth
●● ameloblasts
Answer: produce enamel matrix
develop on inner surface of enamel organ (IEE)
cause outer cells of dental papilla to become odontoblasts
,●● tomes process
Answer: secretes enamel matrix
●● enamel pearl
Answer: small spherical enamel projections on root surface
●● enamel dysplasia
Answer: faulty development of enamel
●● deepened pits and fissures
Answer: common
when ameloblasts back into one another during apposition
larger areas for dental caries
●● sealants
Answer: used in prevention of caries
●● Mineralization
Answer: complete and immediate
,ameloblasts actively pump calcium hydroxyapatite into forming enamel
matrix as it is secreted by tomes process
●● enamel rod
Answer: structural unit of enamel
key hole shaped
rods are aligned DEJ except in cervical regions of permanent teeth
●● lines of retzius
Answer: seen with transmitted light
represent incremental growth lines that extend from DEJ
●● neonatal lline
Answer: a pronounced line of Retzius marked by stress/trauma
experienced by ameloblasts during birth
●● nasmyths membrane
Answer: primary enamel cuticle
delicate membrane covers entire crown of newly erupted tooth
, green or yellow- easily worn away
●● hunter-schreger bands
Answer: seen with reflected light
change in direction from prism to next
originate from DEJ- run perpendicular to lines of retzius
strength against force
●● perikymata
Answer: external manifestation of line of retzius
raised grooves on enamel surface
●● enamel spindles
Answer: dentinal tubules that pass across DEJ into enamel and bcome
trapped
found beneath cusps and incisal tips of teeth
