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max 1st molar

#3 and 14 largest molar
first permanent tooth to errupt on max arch
5 cusps

how many lobes does max 1st molar have?

5 lobes according to five cusps

what are the five cusps?

ML, MF, DF, DL, carabelli

Between MF and DF cusp there is a

facial groove an dpit

what shape is max 1st molar?

trapezoidal, square or rhomboid shape
have a development buccal groove dividing into 2 symmetrical portions

buccal groove oringates at central pit and emerges from between

the two facial cusps

terminal of buccal groove is marked by

buccal pit

DL cusp is

sharp and less developed

From lingual view

ML longest than DL is shortest of all 4 cusps

DL groove & pit-divides tooth how many portions?

2 portions

Carabelli is

supplemental/accessory cusp, varies in size
cusp of carabelli groove
not preseint in all dentition
appear as a groove or cusp or may be absent
not major cusp

Maxillary 1st has

mesial crest is deeper
mesial concavity
DL are lower than table

Maxillary 1st molar-occlusion

grooves are M+D, marginal, triangular, DL, ML, Facial


central grooves runs MD direction between

the mesial pit and distal pit

DL groove extends onto, L surface & separates MI cupz from the DL cusp

ML groove separates teh cusp of carabelli on the occlusal surface

obblique ridge

separates the D fossa from central fossa

Each cusp has a triangular ridge
transverse ridge formed by

buccal triangular ridge of mesiolingual cusp and lingual triangular ridge of mesiobuccal cusp
carabelli-min or non functional cusp

oblique ridge=

only maxiiary molars

union of 2 ridges running obliquely across teh

occlusal surface

on the max 1st molar, oblique ridge is made up of

D ridge of ML cusp and the triangular ridge of DF cup

3 molar cusps form a triangule if lines are drown to connect their cusp tips

df mf dl

oblique ridge sepearates

D fossa and central fossa


2 or F side
1 root on L side

by size of root

lingual/palatal-curves in F largest, longests, strongest. has longitiudinal grooves,
MF curves to D and wider longer of the F roots


straight to D smallest

horns of max molar

3-4, lingual palatal, largest, oval to round, mf 1-3 canals rough. Df small round


facial cervical
middle thirdy

max 2

#2 and #15

max 2nd

less distinct F groove no facial pit
no cups of carabelli
4 lobe=4 roomates

no fifth cusp

4 cus tp centered over lingual area
no fith cusp rinse
dl cusp centered overl light areas
ml cups i slonger and larger
dl cusp is short

3 cusps

ml MF DL

distal margincal ridge same as

oblqiue ridge


central marginal triangular supplemental

4 cusps

ml, fm, df, dh. 2 traingular anatomy
pits cmd grooves cnetral marginal and DB subplemenat

roots of max 3

3 roots,m l, mf, dm, on pulp hard per cusps 3-4 mm
1-2 of root


mm, LM.5 3 o4 for lobes

1 16 max molars

wisdom, may be errupted by 17 most lkely to be missing, impactation mneasn beflore surface, gernally DL cusp abesnt

which sups is gernally abesnt

Distal lingual

smallerst molar

root birfurcated, deep developmental grooves


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