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PRIMARY MAXILLARY 2 nd MOLAR 

PRIMARY MAXILLARY 2 nd MOLAR . Javier Barahmi Tan Quintero Marzan. 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

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PRIMARY MAXILLARY 2 nd MOLAR 

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  1. PRIMARY MAXILLARY 2nd MOLAR  Javier Barahmi Tan Quintero Marzan

  2. 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

  3. Deciduous max 2nd molar Permanent max 1st molar

  4. 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

  5. Proximal aspect MESIAL • 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

  6. 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

  7. … • 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.

  8. 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…

  9. Know at heart <3

  10. Imagine primary maxillary 2nd molar and permanent maxillary 1st molar… They team up. I’m permanent. MUHAHAHA! Deciduous!!!

  11. Primary 2nd molar Permanent 1st molar

  12. CUSP OF CARABELLI

  13. MAXILLARY MOLARS…

  14. …like the Jonas Brothers

  15. 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.

  16. 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.

  17. buccal mesial occlusal

  18. 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.

  19. ANY QUESTIONS???

  20. PRIMARY VS. PERMANENT Linguobuccal cross section • 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

  21. LETS GET READY TO RUMBLE!!! • 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

  22. 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

  23. BYE BYE!!!

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