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Morphology of Human Deciduous Maxillary Molar Tooth
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Morphology of Human Deciduous Maxillary Molar Tooth

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Prof. Rooban Thavarajah's Lecture Series - Morphology of Human Deciduous Maxillary Molar Tooth for first BDS students

Prof. Rooban Thavarajah's Lecture Series - Morphology of Human Deciduous Maxillary Molar Tooth for first BDS students


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  • 1. Prof. Rooban Thavarajah Tooth Morphology Lecture Series Dr. Rooban Thavarajah
  • 2. Dr. Rooban Thavarajah Deciduous Dentition Maxillary Molars
  • 3. BACK GROUND  Does not resemble any other CROWN - nearest similarities to premolars  Root form is typical of maxillary molars.  Crown - greatest dimension BP  Two prominent cusps - MB & ML cusps. two distal cusps esp. DL are diminished. Dr. Rooban Thavarajah
  • 4. Dr. Rooban Thavarajah BUCCAL ASPECT  Does not resemble any other teeth  Buccal  Greatest width MD @ contact areas  Converges towards cervix  Narrower look @ cervix  Smaller than 2nd molar  3 roots- Palatal big, mesial, short distal  Bifurcation of buccal roots @ CEJ
  • 5. BUCCAL ASPECT  MD diameter is much greater than crown height.  Proximal outlines are convex, and constrict greatly toward cervix  Heights of contour – contact areas - near junction of occlusal and middle thirds. Dr. Rooban Thavarajah
  • 6. BUCCAL ASPECT  Occlusal outline – straight - contour of cervical line - depth of curvature - much greater toward mesial than distal - crown - being offset toward mesial.  Occlusally, buccal surface is mostly flat, but in gingival third cervical ridge is prominent, especially mesial portion.  Surface has crest of curvature in cervical third.  Smooth surface Dr. Rooban Thavarajah
  • 7. PALATAL ASPECT Dr. Rooban Thavarajah
  • 8. PALATAL ASPECT  ML cusp is short, bulky and prominent in occlusal outline.  DP cusp is small DB cusp is also visible  Cervical line is evenly, slightly, curved toward apex.  Palatal surface is convex and smooth without grooves or depressions.  Height of contour - more cervically located, at about middle & cervical third junction Dr. Rooban Thavarajah
  • 9. MESIAL ASPECT  Disparity between BP widths @ its cervical and occlusal margins is much more  Cervically, dimension is considerably wider, due to prominent cervical ridge on buccal, as well as greater taper of buccal and lingual outlines toward occlusal. Dr. Rooban Thavarajah
  • 10. MESIAL ASPECT  Buccal outline is dominated by cervical ridge and crest of curvature in cervical third - remainder of outline is usually straight  Lingual outline is generally convex, but with a more cervically located crest of curvature than is present on permanent molars. Dr. Rooban Thavarajah
  • 11. MESIAL ASPECT  2 mesial cusps and mesial marginal ridge make up occlusal outline.  MP cusp is more generous in height and size than is MB cusp – hence - at occlusal, marginal ridge is relatively short.  Cervical line is slightly curved toward occlusal surface Dr. Rooban Thavarajah
  • 12. MESIAL ASPECT Dr. Rooban Thavarajah
  • 13. DISTAL ASPECT  Smaller than mesial surface.  As buccal surface tapers toward distal, much of it is visible from this aspect.  DB cusp is more prominent than small DL cusp Dr. Rooban Thavarajah
  • 14. DISTAL ASPECT  Distal marginal ridge is less pronounced than is mesial.  Mesial cusps actually provide occlusal outline from this aspect. Dr. Rooban Thavarajah
  • 15. DISTAL ASPECT  Cervical ridge is not so prominent in buccal outline as it is from mesial aspect.  Cervical line is straight to slightly curved occlusally. Dr. Rooban Thavarajah
  • 16. OCCLUSAL ASPECT  Crown outline converges Lingually, distally  Rectangular in shape- short side- marginal ridges  Fossa: Central, mesial and distal triangular fossa  Ridges: Mesial, distal marginal ridge, Oblique  Pit: central, mesial, distal Dr. Rooban Thavarajah
  • 17. OCCLUSAL ASPECT Dr. Rooban Thavarajah
  • 18. OCCLUSAL ASPECT  Grooves: central, Buccal developmental, distal developmental, disto-occlusal, supplemental  Major cusps : Mesiolingual & Mesiobuccal  Minor cusp: Distobuccal cusp  If 4 cusp 2 buccal & 2 lingual Dr. Rooban Thavarajah
  • 19. ROOTS  Roots Trifurcated  2 buccal & 1 lingual  Long, slender very flared  Lingual root is largest  Mesiobuccal next largest  Distobuccal is shortest & straightest Dr. Rooban Thavarajah
  • 20. Dr. Rooban Thavarajah
  • 21. Dr. Rooban Thavarajah Maxillary Second Molar  Buccal aspect  ~ to permanent 1st molar, but smaller  2 buccal cusp with well defined DG  Larger than 1st molar  Palatal  3 cusps- MP – large, DP, Cusp of Carabelli  Separated by 2 DG  3 roots seen
  • 22. Dr. Rooban Thavarajah  Proximal : ~ to first molar  Occlusal  Resembles 1st permanent molar  Rhomboidal in shape  4 or 5 cups  Fossa: Central, MT, DT  Pit: central, mesial, distal  Ridge: MMR, DMR, Oblique ridge  Groove: central, BDG< DDG, PDG
  • 23. Dr. Rooban Thavarajah