NBDE Part 1 Dental Anatomy Exam
2025 Questions and Answers
Primary teeth - ANSWER✔✔--less mineralized than permanent teeth, more worn
-difference in space between prim and perm is 2-4mm
-have larger pulp cavities
-mamelons still there past 10 prob. open bite
-calcification of the primary roots usually completed at 3-4 years
-Primary eruption: centrals, laterals, 1st molars, canines, 2nd molars. In general front to
back (except canines), lowers before uppers except laterals
-In the primary dentition the enamel rods in the cervical third is in an OCCLUSAL
direction (permanent dentition is the opposite)
-Anterior teeth/posterior teeth wider MD and shorter IG
Primary molars - ANSWER✔✔--differ from permanent in that their roots are more
divergent.
,-Primary molar lacks an identifiable root trunk
Primary central incisors - ANSWER✔✔--primary mand central inscisors has the
smallest FL crown dimension
-Primary (and permanent) mand central is the most bilaterally symmetrical tooth
-In delayed resoprtion of primary incisors the permaneet incisors usually erupt
lingually (Shark teeth)
-The primary central incisor exhibits a prominent cervical ridge both on the facial and
lingual surfaces
Primary Canine - ANSWER✔✔--From the facial view crown of a primary canine has a
mesio-incisal slope (MCR) longer than the distoincisal.
-the cusp tip of the primary canine is generally off set to the distal
Primary max 1st molars - ANSWER✔✔--max 1st primary molar has a crown that
somewhat resembles a permanent premolar
-The maxillary 1st primary molar has roots that resembles a typical permanent
maxillary molar.
-cervical ridge is most prominent for primary MAXILLARY teeth on the MF suface of
the 1st molar
-root trunk may be absent/small
, Primary max 2nd molar - ANSWER✔✔--the anatomy resembles that of a maxillary
permananet 1st molar
-primary maxillary 2nd molar is the primary tooth that generally has an oblique ridge
-Primary 2nd molar is the only primary posterior tooth that have oblique and transverse
ridges and DL groove.
-the primary 2nd molar generaly exhibits cusp of carabelli
-this is the last tooth to erupt in the primary dentition
-the primary 2nd molar exhibits more cusps than the primary 1st molar.
-The oblique ridge is from the DB cusp to ML
Primary Mandibular 1st molar - ANSWER✔✔--the most prominent facial cervical ridge
of ALL primary teeth. (MF)
-facial view of a primary mand 1st molar the cej is most appically positioned on the
mesial 1/3rd. Due to its prominent cervical ridge
-The primary mand 1st molar usually exhibits a distal triangular fossa. (central is
displaced to distal "main fossa")
-The primary mand 1st molar has the most distinct transverse ridge.
-DOES NOT look like any permanent tooth.
2025 Questions and Answers
Primary teeth - ANSWER✔✔--less mineralized than permanent teeth, more worn
-difference in space between prim and perm is 2-4mm
-have larger pulp cavities
-mamelons still there past 10 prob. open bite
-calcification of the primary roots usually completed at 3-4 years
-Primary eruption: centrals, laterals, 1st molars, canines, 2nd molars. In general front to
back (except canines), lowers before uppers except laterals
-In the primary dentition the enamel rods in the cervical third is in an OCCLUSAL
direction (permanent dentition is the opposite)
-Anterior teeth/posterior teeth wider MD and shorter IG
Primary molars - ANSWER✔✔--differ from permanent in that their roots are more
divergent.
,-Primary molar lacks an identifiable root trunk
Primary central incisors - ANSWER✔✔--primary mand central inscisors has the
smallest FL crown dimension
-Primary (and permanent) mand central is the most bilaterally symmetrical tooth
-In delayed resoprtion of primary incisors the permaneet incisors usually erupt
lingually (Shark teeth)
-The primary central incisor exhibits a prominent cervical ridge both on the facial and
lingual surfaces
Primary Canine - ANSWER✔✔--From the facial view crown of a primary canine has a
mesio-incisal slope (MCR) longer than the distoincisal.
-the cusp tip of the primary canine is generally off set to the distal
Primary max 1st molars - ANSWER✔✔--max 1st primary molar has a crown that
somewhat resembles a permanent premolar
-The maxillary 1st primary molar has roots that resembles a typical permanent
maxillary molar.
-cervical ridge is most prominent for primary MAXILLARY teeth on the MF suface of
the 1st molar
-root trunk may be absent/small
, Primary max 2nd molar - ANSWER✔✔--the anatomy resembles that of a maxillary
permananet 1st molar
-primary maxillary 2nd molar is the primary tooth that generally has an oblique ridge
-Primary 2nd molar is the only primary posterior tooth that have oblique and transverse
ridges and DL groove.
-the primary 2nd molar generaly exhibits cusp of carabelli
-this is the last tooth to erupt in the primary dentition
-the primary 2nd molar exhibits more cusps than the primary 1st molar.
-The oblique ridge is from the DB cusp to ML
Primary Mandibular 1st molar - ANSWER✔✔--the most prominent facial cervical ridge
of ALL primary teeth. (MF)
-facial view of a primary mand 1st molar the cej is most appically positioned on the
mesial 1/3rd. Due to its prominent cervical ridge
-The primary mand 1st molar usually exhibits a distal triangular fossa. (central is
displaced to distal "main fossa")
-The primary mand 1st molar has the most distinct transverse ridge.
-DOES NOT look like any permanent tooth.
