Determinants of occlusion

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Determinants of occlusion

  1. 1. Introduction toOcclusionIdeal AnatomicalContactsB. Cleghorn DMD MScAssociate ProfessorDalhousie University
  2. 2. Which cusp of which tooth is represented by the black dot (red arrow)?Theblack dots 22 black dotsrepresent MI represent 36contacts contact areas of in aClass I occlusion of mandibular teeth with teeth in the maxillary arch
  3. 3. Guidelines for Learning Ideal Contacts Maxillary third molar Maxillary second molarMandibular Maxillary first molar The DB (distobuccal)third molar cusps of the Mandibular mandibular molars second molar contact the central pit Mandibular or fossa of their first molar maxillary counterparts
  4. 4. Guidelines for Learning Ideal Contacts Maxillary third molar Maxillary second molar Maxillary first molar The MB (mesiobuccal)Mandibular cusps of thethird molar mandibular molars Mandibular contact the MMR of second molar their maxillary Mandibular counterparts and the first molar DMR of the tooth mesial to that
  5. 5. Guidelines for Learning Ideal Contacts Maxillary The B (buccal) cusps second of the mandibular premolar premolars contact the Maxillary MMR of their maxillary first counterparts and theMandibular premolar DMR of the toothsecond premolar mesial to that Mandibular first premolar
  6. 6. Guidelines for Learning Ideal Contacts The cusp tip of the mandibular canines Maxillary contacts the MMR of canine their maxillary counterparts and the DMR of the tooth mesial to that (maxillary lateral Mandibular incisor) canine
  7. 7. Guidelines for Learning Ideal Contacts The incisal ridges of the mandibular lateral incisors contact the MMR of Maxillary lateral their maxillary incisor counterparts and the Maxillary DMR of the tooth central incisor mesial to that (maxillary central incisor) The incisal ridges of Mandibular the mandibular lateral central incisors incisor contact the MMR of their maxillary Mandibular central counterparts incisor
  8. 8. Guidelines• Identify tooth shown• Dot represents cusp of opposing tooth• Mandibular teeth are 1/2 cusp mesial to the maxillary counterparts• Contacts same for all mandibular molars • DB cusp (Md) ->Central Fossa (Mx) • MB cusp (Md)-> MMR & DMR (Mx)• B cusps and canines (Md) contact MMR & DMR of teeth 1/2 cusp mesial to maxillary counterparts• Each tooth contacts two teeth • Except maxillary third molars • Except mandibular central incisors
  9. 9. Which cusp of which tooth is represented by the black dot (red arrow)? DB cusp of the mandibular left first molarB cusp of themandibularright firstpremolar
  10. 10. Determinants ofOcclusionHorizontalDeterminantsRidge and GrooveDirectionB. Cleghorn DMD MScAssociate ProfessorDalhousie University
  11. 11. Working
  12. 12. BalancingWorking Working
  13. 13. Protrusion
  14. 14. QuickTime™ and a Animation decompressor are needed to see this picture. BalancingWorking
  15. 15. QuickTime™ and a Animation decompressor are needed to see this picture. BalancingWorking
  16. 16. Protrusion QuickTime™ and a Animation decompressor are needed to see this picture.
  17. 17. Determinants ofOcclusionHorizontalDeterminantsRidge and GrooveDirectionBalancing SideInterferencesB. Cleghorn DMD MScAssociate ProfessorDalhousie University
  18. 18. QuickTime™ and a Animation decompressor are needed to see this picture. BalancingWorking
  19. 19. Frontal View Balancing side Interference •Inner inclines of maxillary MLi cusp (CHC) •Inner inclines of mandibular DB cusp (CHC) BalancingWorking
  20. 20. Determinants ofOcclusionHorizontalDeterminantsRidge and GrooveDirectionWorking SideInterferencesB. Cleghorn DMD MScAssociate ProfessorDalhousie University
  21. 21. QuickTime™ and a Animation decompressor are needed to see this picture. BalancingWorking
  22. 22. Frontal View Working side Interference •Inner inclines of maxillary and mandibular cusps ( Non- CHC cusps) •Outer inclines of maxillary and mandibular cusps (CHC cusps) BalancingWorking
  23. 23. Determinants ofOcclusionHorizontalDeterminantsRidge and GrooveDirectionDistance from theCondylesB. Cleghorn DMD MScAssociate ProfessorDalhousie University
  24. 24. QuickTime™ and a Animation decompressor are needed to see this picture. BalancingWorking
  25. 25. QuickTime™ and a Animation decompressor are needed to see this picture. BalancingWorking
  26. 26. Protrusion QuickTime™ and a Animation decompressor are needed to see this picture.
  27. 27. The anglebetween theworking andidling groovesbecomesgreater thefurther thetooth is fromthe condyles

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