NBDE Part 1 Dental Anatomy UPDATED
ACTUAL Exam Questions and CORRECT
Answers
Primary teeth - CORRECT 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 - CORRECT ANSWER - -differ from permanent in that their roots are more
divergent.
-Primary molar lacks an identifiable root trunk
Primary central incisors - CORRECT 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 - CORRECT 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 - CORRECT 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 - CORRECT 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 - CORRECT 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.
-the primary teeth that differ most from permanent teeth are the MD 1st molars
-the highest and sharpest cusp on a primary mand first molar is the mesiolingual cusp
, Primary mand 2nd molar - CORRECT ANSWER - -larger than the primary mand 1st molar
-resembles the form of the mand 1st molar
-3 buccal cusps nearly equal in size
-overall oval occlusal shape
Primate space - CORRECT ANSWER - -maxillary: between the lateral and the canine
-mandibular: canine and the first molar
-primary spacing for the anterior teeth is most frequently caused by the growth of the dental
arches
Permanent Max Central Incisors - CORRECT ANSWER - -Function primarily for biting
-Max central has the greatest FL axial inclination.
-has the greatest cervical curvature (on mesial) of any other tooth (The CEJ dips lower than any
other tooth)
-Max central are the only anterior teeth that are wider mesio-distally than facio-lingually
-Max central incisor has greater MD crown dimension of any ANTERIOR tooth
-Max central has measurement that is NEARLY identical for Inciso-cervical versus mesio-distal.
-The contact between a max central and lateral incisor makes the lingual embrasure larger than
the facial
-the incisal embrasure between the maxillary centrals is smaller than between the central and the
lateral
-the non molar tooth that most fequently has a mesial and distal pulp horn
-the non molar tooth that is least likely to have a bifurcated root
Permanent Max Laterals - CORRECT ANSWER - -Max lateral has MOST crown shape
variations
-Except for 3rds the maxillary lateral incisor exhibits the most deviation in crown morphology
-The max lateral incisor most often is in abnormal relation and contact with adjacent teeth
-Other than 3rds the tooth that is most often congenitally missing is the max laterals.
ACTUAL Exam Questions and CORRECT
Answers
Primary teeth - CORRECT 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 - CORRECT ANSWER - -differ from permanent in that their roots are more
divergent.
-Primary molar lacks an identifiable root trunk
Primary central incisors - CORRECT 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 - CORRECT 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 - CORRECT 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 - CORRECT 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 - CORRECT 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.
-the primary teeth that differ most from permanent teeth are the MD 1st molars
-the highest and sharpest cusp on a primary mand first molar is the mesiolingual cusp
, Primary mand 2nd molar - CORRECT ANSWER - -larger than the primary mand 1st molar
-resembles the form of the mand 1st molar
-3 buccal cusps nearly equal in size
-overall oval occlusal shape
Primate space - CORRECT ANSWER - -maxillary: between the lateral and the canine
-mandibular: canine and the first molar
-primary spacing for the anterior teeth is most frequently caused by the growth of the dental
arches
Permanent Max Central Incisors - CORRECT ANSWER - -Function primarily for biting
-Max central has the greatest FL axial inclination.
-has the greatest cervical curvature (on mesial) of any other tooth (The CEJ dips lower than any
other tooth)
-Max central are the only anterior teeth that are wider mesio-distally than facio-lingually
-Max central incisor has greater MD crown dimension of any ANTERIOR tooth
-Max central has measurement that is NEARLY identical for Inciso-cervical versus mesio-distal.
-The contact between a max central and lateral incisor makes the lingual embrasure larger than
the facial
-the incisal embrasure between the maxillary centrals is smaller than between the central and the
lateral
-the non molar tooth that most fequently has a mesial and distal pulp horn
-the non molar tooth that is least likely to have a bifurcated root
Permanent Max Laterals - CORRECT ANSWER - -Max lateral has MOST crown shape
variations
-Except for 3rds the maxillary lateral incisor exhibits the most deviation in crown morphology
-The max lateral incisor most often is in abnormal relation and contact with adjacent teeth
-Other than 3rds the tooth that is most often congenitally missing is the max laterals.
