Morphology of Human Deciduous Mandibular Molar teeth

Describes the morphology of Human Deciduous Mandibular Molar teeth

1. Dr. Rooban Thavarajah
Deciduous Dentition
Mandibular Molar

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

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

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

6. Dr. Rooban Thavarajah
Occlusal
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)

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

8. Dr. Rooban Thavarajah

9. Dr. Rooban Thavarajah
Mandibular Second Molar
Similar to 1
st
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

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

11. Dr. Rooban Thavarajah