Occlusion

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Simple occlusion basics.

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Occlusion

  1. 1. Milan Chande
  2. 2.  Definitions  Classifications  Guidance  Basic Mandibular movements
  3. 3.  Overjet – The horizontal distance between the labial surface of the lower incisor and the upper incisal edge  Overbite -The vertical distance between the lower incisal edge and the upper incisal edge - the amount that the upper incisor overlaps the lower incisor.  Openbite - The failure of some opposing teeth to occlude when others are in maximum intercuspation.
  4. 4.  Angle’s Incisal Classification  Angle’s Molar Classification
  5. 5.  The incisal edge of the lower incisor occludes with, or is directly below, the cingulum plateau of the upper incisors
  6. 6.  The incisal edge of the lower incisors lies behind the cingulum plateau of the upper incisors. The upper incisors are of average inclination or proclined, with an increase overjet.
  7. 7.  The incisal edge of the lower incisors lies behind the cingulum plateau of the upper incisors. The upper incisors are retroclined, with minimal overjet although overjet maybe increased.
  8. 8.  The incisal edge of the lower incisors lies in front of the cingulum plateau of the upper incisors; the overjet may be reduced or reversed.
  9. 9.  The mesio-buccal cusp of the upper first permanent molar occludes with the mesio-buccal groove of the lower first permanent molar.
  10. 10.  The mesio-buccal cusp of the upper first permanent molar occludes anterior to the mesio- buccal groove of the lower first permanent molar.
  11. 11.  The mesio-buccal cusp of the upper first permanent molar occludes posterior to the mesio- buccal groove of the lower first permanent molar.
  12. 12.  Static occlusion - Static occlusion is the study of contacts between the teeth when the jaw is not moving. The contacts are points (seen as dots when articulating paper is used). 
  13. 13.  Freedom In Centric -  occlusion occurs when the mandible is able to move anteriorly for a short distance in the same horizontal and sagittal plane while maintaining tooth contact.
  14. 14.  Dynamic occlusion - Dynamic occlusion is the study of the contacts that teeth make when the mandible is moving – contacts when the jaw moves sideways, forwards, backwards, or at an angle. The contacts are not points, they are lines. 
  15. 15.  If the mandible moves to the right, the right is the working side (and left is non-working).   If the mandible moves to the left, the left is the working side (and right is non-working). 
  16. 16. If you slide you teeth to your right, and only your right canines contact during this lateral excursion, then you have canine guidance.
  17. 17. When you slide laterally a number of teeth on your working side are in contact at the same time, all sharing the load, this is called group function. This might happen if your canines have worn down over time, or are crooked.
  18. 18. When you move your jaw laterally, if the first contact is just on a single tooth near the back (on the working side), this is called a working side interference. For example, perhaps there is an upper molar which has tilted into an adjacent extraction space.
  19. 19. A non-working side interference is when any tooth on the opposite side makes the first contact.
  20. 20.  Centric Relation - CR   Retruded Contact Position - RCP  Intercuspal Position - ICP
  21. 21.  Centric Relation can be described as the position of the mandible to the maxilla, with the intra- articular disc in place, when the head of the condyle is against the most superior part of the distal facing incline of the glenoid fossa.  The teeth may be touching in CR, or they may be apart in CR. It is important to understand the jaw has an arc of positions in which the condyles are in Centric Relation.  Centric Relation is a dynamic state.
  22. 22.  The static position of first tooth contact on CR.   RCP occurs at a specific occlusal vertical dimension (OVD).
  23. 23.  The static position of maximum intercuspation.
  24. 24.  http://www.nature.com/bdj/journal/v191/n5/full/4801151  Introduction to Orthodontics – Laura Mitchell  http://www.nature.com/bdj/journal/v196/n7/fig_tab/4811  Orthodontic Clinical Skills

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