Dental Anatomy Exam 2025 With 100%
Correct Answers
Mandibular 1st Premolar - Occlusal - CORRECT ANSWER✔✔- Diamond shaped outline
- Triangular shaped occlusal table
- Facial & lingual triangular ridges form transverse ridge
- Mesial developmental groove continues onto the lingual surface at the ML line angle as the
mesiolingual developmental groove
Mandibular 1st Premolar - Facial - CORRECT ANSWER✔✔- characteristic mesial buldge (the
mirror image of the canine)
- Large, pointed cusp slightly mesial to mesiodistal bisector
Mandibular 1st Premolar - Lingual - CORRECT ANSWER✔✔- Crown has characteristic lingual
conversion
- Occlusal table slants cervically in a a lingual direction
- Lingual cusp is small (almost cingulum-like)
- Mesiolingual groove at area of ML line angle
Mandibular 1st Premolar - Mesial - CORRECT ANSWER✔✔- Rhomboid crown outline
- Tip of facial cusp centered over the root
- Greatest curvature of facial outline at cervical one third of crown
- Greatest curvature of lingual outline in middle third of entire occlusocervical measurement of
the crown
- Contact centered with the facial cusp tip
- Horizontal depression seen just occlusal to CEJ
,- Developmental root depression seen
Mandibular 1st Premolar - Distal - CORRECT ANSWER✔✔- DMR higher and more horizontal
than MMR
- Contact area centered faciolingually & occlusogingivally
- Horizontal depression seen just occlusal to CEJ
- Developmental root depression seen
What are unique characteristics of the mandibular first premolar? - CORRECT ANSWER✔✔-
Viewed as a transitional tooth, much like a canine but with 2 cusps
- Occlusal table slopes cervically in a lingual direction
- Facially, it has a near symmetrical mesial and distal profiles but there is a prominent mesial
bulge
- Mesiolingual groove produces a slight concavity at about the ML line angle
- Occlusal crown outline is diamond shaped while the occlusal table is triangular
- Prominent transverse ridge present
- MMR is less distinct than DMR and slopes lingually at about 45 degree angle (approximates
the DMR of the abutting mandibular canine)
Mandibular 2nd Premolar - Occlusal - CORRECT ANSWER✔✔- May present with 2 or 3 cusps; 2
cusp variety is "H" shaped while 3 cusp variety is "Y" shaped
- No transverse ridges
- 3-cusp variety only mandibular tooth to exhibit lingual divergence (i.e., facial convergence,
maxillary 1st molar is the other)
- Occlusal crown outline is nearly square
Mandibular 2nd Premolar - Facial - CORRECT ANSWER✔✔- Occlusocervical crown dimension is
greater than the MD crown dimension
, - Crown outline form described as trapezoidal or pentagonal
- Tendency for distal curvature of root tip
Mandibular 2nd Premolar - Lingual - CORRECT ANSWER✔✔- Of two lingual cusps, ML is larger
and occupies 2/3 of the MD crown width
- Less lingual convergence than found on mandibular 1st premolar
- 3-cusp variety is likely to have lingual divergence
Mandibular 2nd Premolar - Mesial - CORRECT ANSWER✔✔- Crown outline is rhomboidal
- MMR horizontally positioned at right angle to faciolingual bisector
- Facial cusp tip slightly facial to FL bisector
- ML cusp in line with lingual outline of root
- Mesial contact is oval shaped and is facial to FL bisector
- Lingual height of contour located at occlusal 1/3
Mandibular 2nd Premolar - Distal - CORRECT ANSWER✔✔- 3-cusp variety has all 3 cusps visible
from distal
- DMR is cervical to MMR, shows more of the occlusal surface
- Distal contact area is ovoid (FL direction) and is facial to FL bisector
- Lingual height of contour at the occusal 1/3
What are the general traits of the mandibular premolars? - CORRECT ANSWER✔✔- Well
developed facial cusp, lingual cusps vary in size but are never as well developed as facial cusps
- From occlusal, the crowns are more nearly the same diameter FL and MD
- Facial profiles are significantly inclined lingually from the height of contour to tip of facial cusps
- Lingual height of contour is situated nearer the occlusal 1/3 of lingual cusps but still in the
middle 1/3 of the crown
Correct Answers
Mandibular 1st Premolar - Occlusal - CORRECT ANSWER✔✔- Diamond shaped outline
- Triangular shaped occlusal table
- Facial & lingual triangular ridges form transverse ridge
- Mesial developmental groove continues onto the lingual surface at the ML line angle as the
mesiolingual developmental groove
Mandibular 1st Premolar - Facial - CORRECT ANSWER✔✔- characteristic mesial buldge (the
mirror image of the canine)
- Large, pointed cusp slightly mesial to mesiodistal bisector
Mandibular 1st Premolar - Lingual - CORRECT ANSWER✔✔- Crown has characteristic lingual
conversion
- Occlusal table slants cervically in a a lingual direction
- Lingual cusp is small (almost cingulum-like)
- Mesiolingual groove at area of ML line angle
Mandibular 1st Premolar - Mesial - CORRECT ANSWER✔✔- Rhomboid crown outline
- Tip of facial cusp centered over the root
- Greatest curvature of facial outline at cervical one third of crown
- Greatest curvature of lingual outline in middle third of entire occlusocervical measurement of
the crown
- Contact centered with the facial cusp tip
- Horizontal depression seen just occlusal to CEJ
,- Developmental root depression seen
Mandibular 1st Premolar - Distal - CORRECT ANSWER✔✔- DMR higher and more horizontal
than MMR
- Contact area centered faciolingually & occlusogingivally
- Horizontal depression seen just occlusal to CEJ
- Developmental root depression seen
What are unique characteristics of the mandibular first premolar? - CORRECT ANSWER✔✔-
Viewed as a transitional tooth, much like a canine but with 2 cusps
- Occlusal table slopes cervically in a lingual direction
- Facially, it has a near symmetrical mesial and distal profiles but there is a prominent mesial
bulge
- Mesiolingual groove produces a slight concavity at about the ML line angle
- Occlusal crown outline is diamond shaped while the occlusal table is triangular
- Prominent transverse ridge present
- MMR is less distinct than DMR and slopes lingually at about 45 degree angle (approximates
the DMR of the abutting mandibular canine)
Mandibular 2nd Premolar - Occlusal - CORRECT ANSWER✔✔- May present with 2 or 3 cusps; 2
cusp variety is "H" shaped while 3 cusp variety is "Y" shaped
- No transverse ridges
- 3-cusp variety only mandibular tooth to exhibit lingual divergence (i.e., facial convergence,
maxillary 1st molar is the other)
- Occlusal crown outline is nearly square
Mandibular 2nd Premolar - Facial - CORRECT ANSWER✔✔- Occlusocervical crown dimension is
greater than the MD crown dimension
, - Crown outline form described as trapezoidal or pentagonal
- Tendency for distal curvature of root tip
Mandibular 2nd Premolar - Lingual - CORRECT ANSWER✔✔- Of two lingual cusps, ML is larger
and occupies 2/3 of the MD crown width
- Less lingual convergence than found on mandibular 1st premolar
- 3-cusp variety is likely to have lingual divergence
Mandibular 2nd Premolar - Mesial - CORRECT ANSWER✔✔- Crown outline is rhomboidal
- MMR horizontally positioned at right angle to faciolingual bisector
- Facial cusp tip slightly facial to FL bisector
- ML cusp in line with lingual outline of root
- Mesial contact is oval shaped and is facial to FL bisector
- Lingual height of contour located at occlusal 1/3
Mandibular 2nd Premolar - Distal - CORRECT ANSWER✔✔- 3-cusp variety has all 3 cusps visible
from distal
- DMR is cervical to MMR, shows more of the occlusal surface
- Distal contact area is ovoid (FL direction) and is facial to FL bisector
- Lingual height of contour at the occusal 1/3
What are the general traits of the mandibular premolars? - CORRECT ANSWER✔✔- Well
developed facial cusp, lingual cusps vary in size but are never as well developed as facial cusps
- From occlusal, the crowns are more nearly the same diameter FL and MD
- Facial profiles are significantly inclined lingually from the height of contour to tip of facial cusps
- Lingual height of contour is situated nearer the occlusal 1/3 of lingual cusps but still in the
middle 1/3 of the crown
