Describes the morphology of Human Deciduous Mandibular Molar teeth

1. Deciduous Dentition
Mandibular Molar
Dr. Rooban Thavarajah

2. Mandibular First Molar
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No resemblance to any teeth; primitive
Dr. Rooban Thavarajah

3. Buccal
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Mesial outline straight -little
constriction @ cervix
Distal outline converges;
short distal side
No DG but a depression
seen
Large MB cusp
Mesial outline is flat
Distal is more convex to
buccal cusp
Bifurcation is close to
cervical line
Dr. Rooban Thavarajah

4. 
Lingual
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Crown, root converge lingually on mesial
surface, opposite on distal surface.
DL cusp rounded
ML – sharp and long
MMR well developed
Dr. Rooban Thavarajah

5. 
Proximal
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No resemblance to any teeth
Mesial is extremely bulbous in cervical 1/3
Distal is more uniform
Dr. Rooban Thavarajah

6. 
Occlusal
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Rhomboidal in shape
MB line angle prominent
ML cusp – largest, well formed, widest
Mesiobuccal ridge pronounced
May have short buccal groove, Lingual groove
Central groove
3 pits (in 2 fossa)
Dr. Rooban Thavarajah

7. 
Roots
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2 roots bifurcated
Flat and broad flared
Mesial root has a longitudinal groove
Distal root is shorter and thinner
Dr. Rooban Thavarajah

8. Dr. Rooban Thavarajah

9. Mandibular Second Molar
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Similar to 1st permanent molar but small
Typical constriction at cervix
5 cusps MB, DB, D ML, DL
Mesiobuccal and Distobuccal groove
separates the 3 buccal cusp
Lingual groove separates the 2 lingual
cusps
Buccal cusps equal in size ~ lingual cusps
Dr. Rooban Thavarajah

10. 
Proximal
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Roots are twice as long as the crown
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Similar to permanent molar
Long, slender and flared
Mesial root may have a longitudinal groove
Distal root –no groove
Occlusal
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Rectangular in shape
Dr. Rooban Thavarajah

11. Dr. Rooban Thavarajah