Posterior Anatomy

Front 1

triangular ridge

Back 1

occlusal surface from tip of cusp to central groove

Front 2

tranverse ridge

Back 2

union of two triangular ridges

Front 3

marginal ridge

Back 3

located on mesial and distal sides of occlusal surface

Front 4

secondary groove

Back 4

minor groove like a "wrinkle"

Front 5

eruption dates of #5 and 12

Back 5

10-11 yrs

Front 6

eruption dates of #4 and 13

Back 6

10-12 yrs

Front 7

cusps of maxillary first premolar

Back 7

buccal and lingual

Front 8

maxillary first premolar grooves

Back 8

DB groove, DL groove, MB groove, ML groove, central groove... mesial marginal groove

Front 9

maxillary first premolar root char.

Back 9

two roots: 2 roots (buccal and lingual), only premolar with bifurcation, buccal root is longer, mesial interradicular groove

Front 10

maxillary second premolar char.

Back 10

smaller crown than maxillary first premolar, buccal cusp=lingual cusp in length, features are closer together, all grooves are the same as first premolar

Front 11

maxillary second premolar root char.

Back 11

one root, longer root than #5

Front 12

mandibular premolar eruption dates

Back 12

#21 and 28- 10-12yrs

#20 and 29- 11-12yrs

Front 13

mandibular first premolar char.

Back 13

large buccal cusp (lingual cusp is afunctional), prominent transverse ridge, mesial cusp slope is shorter than distal cusp slope

Front 14

mandibular first premolar grooves

Back 14

MB groove, ML groove (comes over occlusal surface!), DB groove, DL groove, central groove(may be absent)

Front 15

mandibular first premolar root char.

Back 15

1 root, shorter root than #20 and 29, deeper mesial fluting

Front 16

mandibular second premolar char.

Back 16

large crown and root, THREE cusps (B, ML, and DL), Y groove pattern- MB, DB, L
H or U groove pattern possible, NO TRANSVERSE RIDGE.

Front 17

mandibular second premolar root char.

Back 17

apex points distally

Front 18

molar eruption dates

Back 18

first molar- 6yrs
second molar- 12 yrs
third molar- 17-21 yrs

Front 19

maxillary first molar cusps

Back 19

FIVE CUSPS, ML(largest), MB, DB, DL, Cusp of Carabelli

Front 20

maxillary first molar roots

Back 20

THREE ROOTS, lingual, MB, and DB

Front 21

maxillary first molar grooves

Back 21

buccal, lingual, central, cusp of carabelli, DB, MB, ML, distal oblique

Front 22

oblique ridge on max first molar

Back 22

connect ML and DB cusps

Front 23

transverse ridge on max first molar

Back 23

connects ML and MB cusps

Front 24

max first molar root char.

Back 24

MB root curves distally, 2 ROOT CANALS in MB root, DB root is straighter

Front 25

max second molar char.

Back 25

four cusps- ML, MB, DB and DL(smallest), three roots- L, MB, DB

Front 26

max third molar

Back 26

strangest tooth, agenesis, HEART SHAPED CROWN, DL cusp is usually absent, fused roots

Front 27

mandibular first molar

Back 27

FIVE CUSPS- MB(biggest), ML, DL, DB, and Distal, crown is lingually inclined, ML and DL cusps are tallest

Front 28

mandibular first molar occlusal

Back 28

Y groove pattern- MB, DB, and L grooves, central, mesial, and distal fossae and pits, THERE IS NO TRANSVERSE RIDGE!

Front 29

mandibular first molar root char.

Back 29

mesial and distal roots, mesial is curved and wider (can have 2 pulp canals), mesial root is longer

Front 30

mandibular second molar char./occlusal

Back 30

four cusps are equal in size- MB, ML, DB, DL, + groove pattern (B, L, C), 2 TRANSVERSE RIDGES connecting MB and ML AND DB and DL cusps

Front 31

mandibular second molar root char.

Back 31

2 roots- M (curved and larger) and D. bifurcation is 4-5 mm from cej

Front 32

mandibular third molar char.

Back 32

agenesis, resembles a small second molar, 2 short fused roots, DILACERATE.