Morphology Molars

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emm64
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110600
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Morphology Molars
Updated:
2011-10-20 14:45:07
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Morphology Molars
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Morphology Molars
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  1. ´╗┐General Functions of Molars
    • Mastication: Chewing and grinding
    • Esthetics: Maintain vertical dimension of the face
    • Provide cheek support
  2. General Features of Permanent Molars
    • Largest and strongest teeth
    • 3 to 5 cusps
    • 2 cusps are on the buccal
    • 2 or 3 roots
  3. Non-Succedaneous Teeth
    • Permanent molars erupt distal to the primary dentition.
    • 1st molars are first permanent teeth to erupt “6 year molars”
  4. Maxillary Molars
    • Crowns wider B-L than M-D
    • Usually 4 cusps
    • 2 lingual cusps of different size
    • Oblique ridge!!
    • 3 roots
    • Supporting cusps: lingual
  5. Oblique Ridge
    • Defining feature of all maxillary molars
    • Extends diagonally across the occlusal surface:
    • triangular ridge of DB cusp to distal cusp ridge of the ML cusp
  6. Other Occlusal Features of Maxillary Molars
    • Is there a transverse ridge?
    • How many marginal ridges are present? Where?
    • Identify the major supporting cusp.
  7. Maxillary 1st Molar (3, 14)
    • 4 major cusps: ML>MB>DB>DL
    • Cusp of Carabelli on ML cusp
    • DL cusp is largest of the max molars
    • 3 tripoded roots: Pal>MB>DB
  8. Maxillary 2nd Molar (2, 15)
    • Smaller than 1st
    • DL cusp is smaller than on 1st
    • No Cusp of Carabelli
    • Roots are closer together
  9. Maxillary 3rd Molar Cusps
    • Maxillary 3rd molars have 3 or 4 cusps.
    • 3 cusp form has heart-shaped occlusal table
    • Cusp size: ML>MB>DB>DL (if present)
  10. Maxillary 3rd Molar (1, 16)
    • 3 or 4 cusps
    • Heart shaped occlusal table
    • DL cusp very small or absent
    • Roots fused or very close together
    • Maxillary 3rd molars have 3 or 4 cusps.
    • 3 cusp form has heart-shaped occlusal table
    • Cusp size: ML>MB>DB>DL (if present)
  11. Mandibular Molars
    • Crowns wider M-D than B-L
    • 4 or 5 cusps
    • 2 roots
    • No oblique ridge
    • Lingual inclination of buccal surface
    • Supporting cusps = buccal
  12. Mandibular 1st Molar (19, 30)
    • 5 cusps
    • Distal cusp is smallest and on the buccal aspect
    • 2 roots
    • Mesial and distal
    • Occlusal Features of Mandibular 1st Molars
    • Identify supporting cusps
    • 3 buccal cusps
    • 2 lingual cusps
    • Locate the marginal ridges
    • Transverse ridges?
  13. Mandibular 2nd Molar Root Features
    • Mesial root is wider than distal root.
    • Mesial MR higher than distal MR
  14. Occlusal Features of Mandibular 2nd Molars
    • Supporting cusps are MB and DB
    • Marginal ridges
    • Distinct transverse ridges
  15. Mandibular 2nd Molar (18, 31)
    • 4 cusps
    • No D cusp
    • Symmetrical
  16. Pericoronitis
    • Clinical Applications: 3rd Molars
    • Most common congenitally missing tooth
    • Frequently impacted due to lack of space
    • Pericoronitis when partially erupted
  17. Mandibular 3rd Molar (17, 32)
    • 4 or 5 cusps (so crown can look like 1st or 2nd molar)
    • Extra grooves
    • Roots fused or very close together

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