Week 15 Ch 15 - Molars

grind or crush food

what is the primary function of molars?

max 1st molars - lingual

ML cusp largest followed by MB; DL cusp smallest and shortest; ML groove separates cusp if Carabelli; lingual root usually longest

max 1st molars - mesial

clear profile cusp of Carabellli; cervical line convex mesially

max 1st molars - distal

slight concavity on distal surface of root trunk; DB root is narrowest of all three; tendency to taper distally

max 1st molars - occlusal

rhomboidal outline; crown wider on mesial vs distal; only tooth that is wider lingually vs buccally

central developmental groove

terminates at the mesial triangular fossa, joins MB & ML triangular grooves

oblique ridge

transverse ridge unique to max molars - runs from tip of ML cusp to tip of DB cusp

distal fossa

runs parallel with and distal to oblique ridge - long and narrow

cusp of carabelli, occlusal outline rhomboidal, DL cusp well developed, prominent oblique ridge and DL grooves, crown nearly as wide MD as BL, roots widely separate

what are some identifying characteristics of max 1st molars?

11-13 years

what is eruption age for max 2nd molars?

max 2nd molars - occlusal

less rhomboidal; DB cusp slightly smaller, DL cusp noticeably smaller; more supplemental grooves and pits

5th cusp usually absent, roots less separated, crown shorter

what is the main difference between max 1st and 2nd molars?

17-22 years

what is eruption age for max 3rd molars?

roots fuse into one, occlusal outline - heart shaped, DL cusp poorly developed or missing

what are the general features of max 3rd molars?

max molars - roots

trifurcated - all visible from buccal view; shorter, varies more in shape, size and direction as you go more posterior

4 major cusps, 1 minor cusp

how many cusps do mand molars have?

6-7 years

what is eruption age for mand 1st molars?

DL cusp largest, then DB cusp, D cusp is smallest

what are the sizes on distal aspect for mand 1st molars?

pentagonal

what shape is occlusal outline of mand 1st molar?

buccal and lingual grooves form Y on surface

what grooves and shapes does mand 1st molars form?

5 cusps; wider mesiodistally than buccolingually; crown converges lingually and slightly distally; 3 buccal cusps separates by 2 buccal grooves - 2 lingual cusps separated by 1 lingual groove; 2 roots, 3 root canals

what are some identifying characteristics of mand 1st molars?

11-13 years

what is eruption age for mand 2nd molars?

rectangualar

what shape is occlusal outline for mand 2nd molar?

mand 2nd molars

4 cusps same size; has cross-groove pattern from B/L groove; 2 roots close together; one root canal in distal, mesial root can have 1 or 2 root canals

most variable mandibular teeth, 2 roots are often fused and inclined distally

what are some identifying characteristics of mand third molars?