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Maxillary Molars

Maxillary Molars.

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Maxillary Molars

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  1. Maxillary Molars

  2. Maxillary MolarsMaxillary molars are the largest teeth in the maxillary arch. The permanent molars are not succedaneous teeth because they don’t have any predecessors. The deciduous molars are still in place when the first permanent molars erupt at the age of 6.Maxillary First MolarIt has a large crown with four well developed cusps and occasionally a small fifth cusp. In addition to the cusps it has three well formed roots; two buccal and one lingual. Dr.SyedSadatullahIbnsina National Medical College

  3. Buccal aspect • The crown is roughly trapezoidal • Mesiobuccal and distobuccal cusps are the two buccal cusps • Part of mesiolingual and distolingual cusps are seen from this aspect as the distolingual line angle is obtuse • The buccal developmental groove divides the two buccal cusps.

  4. Buccal aspect

  5. Lingual aspect • General outline of lingual aspect is reverse of buccal aspect • The mesiolingual, distolingual and fifth cusp are the only cusps seen from this aspect • Mesiolingual cusp is largest of all the cusps. Distolingual cusp is small and spheroidal

  6. The lingual developmental groove separates the lingual cusps • Sometimes a fifth cusp called the cusp of carebelli may be present. When present it attached to the mesiolingual surface of the mesiolingual cusp. Lingual aspect

  7. Mesial aspect • Mesiobuccal, mesiolingual and fifth cusps are visible from this aspect also • Mesial marginal ridge is confluent with the mesiobuccal and mesiolingual cusp ridges and is curved cervically • The cervical line is irregular, curving occlusally • The contact area is at the junction of the middle and occlusal third, closer to the buccal aspect • A shallow concavity is found just below the contact are.

  8. Mesial aspect

  9. Distal aspect • Distobuccal and distolingual cusps are seen • The marginal ridge dips sharply cervically • The cervical line is almost straight Distal aspect

  10. Occlusal aspect • The occlusal aspect is roughly rhomboidal in shape • Maxillary first molar crown is wider mesially than distally and wider lingually than buccally • The elevations and depression on this surface are: 1. Cusps • Mesiolingual cusp is the largest followed by mesiobuccal, distolingual, distobuccal, and the smallest being the fifth cusp.

  11. 2. Ridges • Mesial marginal ridge and distal marginal ridge • Oblique ridge • 3. Fossae • Major fossae: central fossa and distal fossa • Minor fossae: mesial triangular and distal triangular fossae 4 Grooves • Central developmental groove • Buccal developmental groove • Lingual developmental groove • Transverse groove of the oblique ridge • Distal oblique groove • Fifth cusp groove • Supplemental grooves

  12. 5 Pit • Central developmental pit Occlusal aspect

  13. Root • Maxillary first molar has three roots; two buccal and one lingual • The lingual root is long and slender with bluntly round apex • Mesiobuccal root is broader and curves distally while the distobuccal root is narrower at the base and a lot straighter

  14. Average Dimensions in millimeters Crown Length Root Length Mesiodistal Diameter at Contact Area Mesiodistal Diameter at Cervical Line Labiolingual Diameter at Crest of Curvature Labiolingual Diameter at Cervical Line Curvature of Cervical Line M D 7.5 B L 12 13 10.0 8.0 11.0 10.0 1.0 0 • Both the buccal roots are of equal size but smaller than the lingual root • The level of bifurcation area is more closer to the cervical area on the mesial side than on the distal side.

  15. Maxillary Second Molar • The crown is shorter cervico-occlusally and about the same width buccolingually when compared with maxillary first molar • The distobuccal cusp is not as well developed and the distolingual cusp is also small. The fifth cusp is absent • The roots are as long as, if not somewhat longer than those of the first molar • The elevations and depression on the occlusal surface are similar to that of maxillary first molar.

  16. Occlusal aspect Buccal aspect Distal aspect Lingual aspect Mesial aspect Maxillary Second Molar

  17. Maxillary Third Molar • Maxillary third molar varies considerably in size, shape and position • It often presents itself as a developmental anomaly • Third molar supplements second molar and is also similar in its design • All third molars show more developmental variation than any other teeth in the dentition

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