PRIMARY MAXILLARY 2nd MOLAR

Javier BarahmiTanQuinteroMarzan

Buccal aspect • 2 well-defined cusps= MB, DB• Crown narrow at cervix in

comparison w/ its MD measurement at contact areas

• Crown much bigger than first primary molar

• Roots appear slender, but are much longer and heavier than those of max 1st molar

• Point of bifurcation bet. Buccal roots is close to cervical line.

• 2 buccal cusps more nearly equal in size

Deciduous max 2nd molar

Permanent max 1st molar

Lingual aspect • 3 cusps: MLC, DLC, and 3rd

supplemental cusp• Tubercle of carabelli/ 5th cusp-

poorly developed; acts as a buttress or supplement for the bulk of MLC

• Developmental grooves separates MLC from DLC and connects with DG which outlines the 5th cusp

• Lingual Root is large and thick, almost same length as MBR

Proximal aspectMESIAL

• Crown resembles that of the permanent molars

• Crown appears short because of its with buccolingually

• MLC cusp larger than MBC• MBC short and sharp • Very little curvature to the

cervical line• MBR is broad and flat• MBR presents itself being quite

wide from the mesial aspect

Still proximal!!!DISTAL

• Outline of the crown lingually creates a smooth rounded line, describing the buccal surface is almost straight from the crest of curvature to the tip of the buccal cusp.

• DBC and DLC are about the same length

• Cervical line approximately straight• Only a part of the outline of MBR is

seen, since DBR is superimposed over it

…• DBR is shorter and

narrower than the other roots

• Point of bifurcation bet. DBR and LR is more apical

• Point of bifurcation bet. The 2 roots is nearly centered above the crown.

Occlusal aspect• Resembles permanent first molar• Rhomboidal and has 4 well-

developed cusp and 1 supplemental cusp: MB, DB, ML, DL, and fifth cusp

• Developmental grooves bet. Cusps less marked than that found on the first permanent molar.

• DG, pits, obliuqe ridge are almost identical

• Central fossa w/ central pit, mesial triangular fossa…

Know at heart <3

I’m permanent.MUHAHAHA!

Deciduous!!!

Imagine primary maxillary 2nd molar and permanent maxillary 1st molar…

They team up.

Primary 2nd molar

Permanent 1st molar

CUSP OF CARABELLI

MAXILLARY MOLARS…

…like the Jonas Brothers

ALL ABOUT ROOTS •Max molars are trifurcated- anchor

against forces that would displace them•3 roots- MB, DB, and L 1 root trunk•All 3 roots are usually visible from buccal

view•Deciduous molars have a shorter root

trunk than permanent molars do.

GOOD TO KNOW…•The flaring of roots in primary molars serve

to allow more room between the roots for the development of the permanent tooth crowns

•Cervical ridges buccally on the primary molars are much more pronounced

•Buccal and lingual surfaces are flatter above the cervical curvatures than those of permanent molars narrowing occlusal surfaces.

buccal

mesial

occlusal

Keep in mind… (for permanent)•Roots become shorter as the max molar is

more posterior.•Roots become less divided as max molar

is more posterior.•Roots become more varied in shape, size,

and direction of curvature as max molar is more posterior.

ANY QUESTIONS???

PRIMARY VS. PERMANENT• Enamel cap of primary

molars is thinner and has a more consistent depth

• Primary molars has greater thickness of dentin over the pulpal wall at the occlusal fossa

• Pulp horns are higher in primary molars

• Cervical ridges are more pronounced in primary

• Enamel rods at the cervix slope occlusally as in permanent teeth

Linguobuccal cross section

•Primary molars have a markedly constricted neck compared to permanent

•Roots of primary teeth are longer and more slender in comparison with crown size than those of permanent

Roots of primary flare out nearer the cervix

LETS GET READY

TO RUMBLE!!!

DON’T YOU EVER FORGET!• Crown widths in all

directions are large in comparison with root trunks and cervices

• Enamel is relatively thin and has a consistent depth

• Pulp horns are high and pulp chambers are large

• Primary roots are narrow and long when compared with crown width and length

• Molar roots of primary teeth flare markedly and thin out rapidly as the apices are approached

BYE BYE!!!