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MORPHOLOGYMORPHOLOGY
OFOF
Mandibular MolarsMandibular Molars
Mandibular MolarsMandibular Molars
Mandibular molars are the biggest teeth in theMandibular molars are the biggest teeth i...
Mandibular First Molar
The crown is shorter cervico-occlusally than that of
anterior teeth but bigger in every other dimen...
Buccal aspect
 The crown is roughly trapezoidal from this aspect
 Mesiobuccal and distobuccal cusps are flat while the
d...
Buccal aspect
Lingual aspect
 Three cusps may be seen; two lingual and the lingual
portion of the distal cusp
 The mesiolingual and di...
Lingual
aspect
Mesial aspect
 Two cusps; mesiobuccal and distobuccal cusps, and one
root; mesial root, are visible from this aspect
 Th...
Mesial aspect
Distal aspect
 The gross outline is similar to the mesial aspect
 More of the tooth is seen from this aspect because
the...
Distal aspect
Occlusal aspect
 The occlusal aspect is roughly hexagonal in shape
 The crown is wider mesiodistally than buccolingually...
 The elevations and depressions on this surface are:
1. Cusps
 Mesiobuccal cusp is the largest followed by the two lingu...
Occlusal
aspect
Roots
Mandibular first molar has two roots; mesial and distal
roots
The apical third of the both the roots tend to curve...
1.0 09.010.59.011.014.07.5
Curvature of Cervical
Line
M D
Labiolingual
Diameter at
Cervical Line
Labiolingual
Diameter at
...
Mandibular Second Molar and Third Molar
Mandibular second molar is smaller than the first molar
and the third molar is sm...
Buccal aspect
Mandibular 2nd
Molar
-From this aspect the
crown is shorter cervico-
occlusally
-Two buccal cusps are
seen: ...
Buccal aspect
Mandibular 2nd
Molar Mandibular 3rd
Molar
Lingual aspect
Mandibular 2nd
Molar
-Two lingual cusps are
seen: mesiolingual cusp
and distolingual cusp
-lingual developm...
Lingual
aspect
Mandibular 2nd
Molar Mandibular 3rd
Molar
Mesial aspect
Mandibular 2nd
Molar
-The mesiodistal
measurement is a
fraction less than 1st
molar
-The cervical ridge on
t...
Mesial aspect
Mandibular 3rd
MolarMandibular 2nd
Molar
Distal aspect
Mandibular 2nd
Molar
-When compared with 1st
molar this aspect doesn’t
have distal cusp and
distobuccal groo...
Distal aspect
Mandibular 3rd
MolarMandibular 2nd
Molar
Occlusal aspect of Mandibular 2nd
molar
 The occlusal aspect of 2nd
molar differs
considerably from the 1st
molar
 The d...
The elevations and depressions on this surface are:
1. Cusps
 Mesiobuccal, distobuccal, mesiolingual and distolingual cus...
Occlusal aspect of Mandibular Second Molar
Occlusal aspect of Mandibular 3rd
molar
 When fully developed the occlusal aspect of 3rd
molar is quite similar to the 2n...
Roots
Mandibular 2nd
Molar
-The tooth has two well
developed roots; one
mesial and one distal
-They are broad
mesiodistall...
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morphology of mandibular 1st,2nd,3rd molars teeth

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anatomical position,importance point,eruption time,shedding

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morphology of mandibular 1st,2nd,3rd molars teeth

  1. 1. MORPHOLOGYMORPHOLOGY OFOF Mandibular MolarsMandibular Molars
  2. 2. Mandibular MolarsMandibular Molars Mandibular molars are the biggest teeth in theMandibular molars are the biggest teeth in the mandibular arch.mandibular arch. They have two broad roots for superior anchorage.They have two broad roots for superior anchorage. The crown of lower molars are wider mesiodistally thanThe crown of lower molars are wider mesiodistally than buccolinguallym the opposite is true of upper molars.buccolinguallym the opposite is true of upper molars.
  3. 3. Mandibular First Molar The crown is shorter cervico-occlusally than that of anterior teeth but bigger in every other dimension It has five cusps ; two buccal, two lingual and one distal It has two roots; one mesial and one distal It erupts at the age of 6 years
  4. 4. Buccal aspect  The crown is roughly trapezoidal from this aspect  Mesiobuccal and distobuccal cusps are flat while the distal cusp is pointed  Two developmental grooves appear on this aspect; mesiobuccal and distobuccal developmental grooves.  A cervical ridge is found near the cervical line  Cervical line is normally a regular dipping apically towards the root bifurcation.
  5. 5. Buccal aspect
  6. 6. Lingual aspect  Three cusps may be seen; two lingual and the lingual portion of the distal cusp  The mesiolingual and distolingual cusps are pointed and have cusp ridges that are high enough to hide the buccal cusps  The lingual developmental groove separates the lingual cusps  The cervical line lingually is irregular.
  7. 7. Lingual aspect
  8. 8. Mesial aspect  Two cusps; mesiobuccal and distobuccal cusps, and one root; mesial root, are visible from this aspect  The mesial aspect of the tooth is broader and the mesial cusps are higher hence the distal portion cannot be seen  The mesial marginal ridge is confluent with the mesial ridges of the mesial cusps  The contact are is in near the junction of middle and occlusal third.
  9. 9. Mesial aspect
  10. 10. Distal aspect  The gross outline is similar to the mesial aspect  More of the tooth is seen from this aspect because the distal portion is smaller and the buccal and lingual surfaces converge distally  The distal cusp is in the foreground from this aspect  The cervical line is usually straight
  11. 11. Distal aspect
  12. 12. Occlusal aspect  The occlusal aspect is roughly hexagonal in shape  The crown is wider mesiodistally than buccolingually  The buccolingual measurement on the mesial portion is bigger than on the distal portion
  13. 13.  The elevations and depressions on this surface are: 1. Cusps  Mesiobuccal cusp is the largest followed by the two lingual cusps, then the distobuccal, and the smallest being the distal cusp. 2. Ridges  Mesial marginal ridge and distal marginal ridge 3. Fossae  Major fossae: central fossa  Minor fossae: mesial triangular and distal triangular fossae 4 Grooves  Central developmental groove  Mesiobuccal developmental groove  Distobuccal developmental groove  Lingual developmental groove  Supplemental grooves 5 Pit  Central developmental pit
  14. 14. Occlusal aspect
  15. 15. Roots Mandibular first molar has two roots; mesial and distal roots The apical third of the both the roots tend to curve distally Both roots are wider buccally than they are lingually Deep developmental depression is found on the root trunk
  16. 16. 1.0 09.010.59.011.014.07.5 Curvature of Cervical Line M D Labiolingual Diameter at Cervical Line Labiolingual Diameter at Crest of Curvature Mesiodistal Diameter at Cervical Line Mesiodistal Diameter at Contact Area Root Length Crown Length Average Dimensions in millimeters
  17. 17. Mandibular Second Molar and Third Molar Mandibular second molar is smaller than the first molar and the third molar is smaller than the second molar Mandibular second molar has four well developed cusps The third molar varies considerably in shape and position and presents many anomalies. . Mandibular 3rd molar occasionally has four cusps, but five cusps and more than five cusps are also not uncommon
  18. 18. Buccal aspect Mandibular 2nd Molar -From this aspect the crown is shorter cervico- occlusally -Two buccal cusps are seen: mesiobuccal cusp and distobuccal cusp -Both the cusps are equal in size -Buccal developmental groove separates the two buccal cusps Mandibular 3rd Molar -From this aspect the tooth varies considerably. -The four cusp type has two buccal cusps -The buccal cusps are shorter and rounded -Both the cusps are equal in size
  19. 19. Buccal aspect Mandibular 2nd Molar Mandibular 3rd Molar
  20. 20. Lingual aspect Mandibular 2nd Molar -Two lingual cusps are seen: mesiolingual cusp and distolingual cusp -lingual developmental groove separates the two lingual cusps -Crown and root converge lingually but to a lesser degree Mandibular 3rd Molar -A well developed 3rd molar closely resembles a 2nd molar except for the size and root development
  21. 21. Lingual aspect Mandibular 2nd Molar Mandibular 3rd Molar
  22. 22. Mesial aspect Mandibular 2nd Molar -The mesiodistal measurement is a fraction less than 1st molar -The cervical ridge on the buccal surface is less pronounce -The cervical line is less curved, being straight Mandibular 3rd Molar -From this aspect 3rd molar resembles 2nd molar except for its dimensions
  23. 23. Mesial aspect Mandibular 3rd MolarMandibular 2nd Molar
  24. 24. Distal aspect Mandibular 2nd Molar -When compared with 1st molar this aspect doesn’t have distal cusp and distobuccal groove Mandibular 3rd Molar -From this aspect too this tooth resembles 2nd molar except for its dimensions
  25. 25. Distal aspect Mandibular 3rd MolarMandibular 2nd Molar
  26. 26. Occlusal aspect of Mandibular 2nd molar  The occlusal aspect of 2nd molar differs considerably from the 1st molar  The distal cusp and distobuccal groove are absent  The buccal and lingual grooves meet in the centre at right angles. The occlusal surface is roughened by numerous supplemental grooves
  27. 27. The elevations and depressions on this surface are: 1. Cusps  Mesiobuccal, distobuccal, mesiolingual and distolingual cusps 2. Ridges  Mesial marginal ridge and distal marginal ridge 3. Fossae  Major fossae: central fossa  Minor fossae: mesial triangular and distal triangular fossae 4 Grooves  Central developmental groove  buccal developmental groove  Lingual developmental groove  Supplemental grooves 5 Pit  Central developmental pit
  28. 28. Occlusal aspect of Mandibular Second Molar
  29. 29. Occlusal aspect of Mandibular 3rd molar  When fully developed the occlusal aspect of 3rd molar is quite similar to the 2nd molar Occlusal aspect
  30. 30. Roots Mandibular 2nd Molar -The tooth has two well developed roots; one mesial and one distal -They are broad mesiodistally but not as broad as 1st molar -They are inclined distally Mandibular 3rd Molar --Roots are short and poorly formed --An average tooth shows two roots; one mesial and one distal --They may be separated or fused
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anatomical position,importance point,eruption time,shedding

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