Determinants of occlusion
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Transcript of Determinants of occlusion
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B. Cleghorn DMD MScAssociate ProfessorDalhousie University
Introduction to Occlusion
Ideal Anatomical Contacts
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Which cusp of which tooth is represented by the black dot (red arrow)?
The black dots represent MI contacts in a Class I occlusion
22 black dots represent 36 areas of contact of mandibular teeth with teeth in the maxillary arch
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Guidelines for Learning Ideal Contacts
The DB (distobuccal) cusps of the mandibular molars contact the central pit or fossa of their maxillary counterparts
Maxillary third molar
Mandibular third molar
Maxillary second molar
Mandibular second molar
Maxillary first molar
Mandibular first molar
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Guidelines for Learning Ideal Contacts
The MB (mesiobuccal) cusps of the mandibular molars contact the MMR of their maxillary counterparts and the DMR of the tooth mesial to that
Maxillary third molar
Mandibular third molar
Maxillary second molar
Mandibular second molar
Maxillary first molar
Mandibular first molar
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Guidelines for Learning Ideal Contacts
The B (buccal) cusps of the mandibular premolars contact the MMR of their maxillary counterparts and the DMR of the tooth mesial to that
Maxillary second premolar
Mandibular second premolar
Maxillary first premolar
Mandibular first premolar
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Guidelines for Learning Ideal Contacts
The cusp tip of the mandibular canines contacts the MMR of their maxillary counterparts and the DMR of the tooth mesial to that (maxillary lateral incisor)
Maxillary canine
Mandibular canine
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Guidelines for Learning Ideal Contacts
The incisal ridges of the mandibular lateral incisors contact the MMR of their maxillary counterparts and the DMR of the tooth mesial to that (maxillary central incisor)
The incisal ridges of the mandibular central incisors contact the MMR of their maxillary counterparts
Maxillary lateral incisor
Mandibular lateral incisor
Maxillary central incisor
Mandibular central incisor
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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
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Which cusp of which tooth is represented by the black dot (red arrow)?
DB cusp of the mandibular left first molar
B cusp of the mandibular right first premolar
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B. Cleghorn DMD MScAssociate ProfessorDalhousie University
Determinants of Occlusion
Horizontal DeterminantsRidge and Groove Direction
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Working
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Working
Balancing
Working
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Protrusion
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Balancing
Working
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Balancing
Working
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Protrusion
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B. Cleghorn DMD MScAssociate ProfessorDalhousie University
Determinants of Occlusion
Horizontal DeterminantsRidge and Groove DirectionBalancing Side Interferences
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Balancing
Working
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Balancing
Working
Balancing sideInterference•Inner inclines of maxillary MLi cusp (CHC) •Inner inclines of mandibular DB cusp (CHC)
Frontal View
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B. Cleghorn DMD MScAssociate ProfessorDalhousie University
Determinants of Occlusion
Horizontal DeterminantsRidge and Groove DirectionWorking Side Interferences
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Balancing
Working
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Balancing
Working
Working sideInterference•Inner inclines of maxillary and mandibular cusps ( Non- CHC cusps) •Outer inclines of maxillary and mandibular cusps (CHC cusps)
Frontal View
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B. Cleghorn DMD MScAssociate ProfessorDalhousie University
Determinants of Occlusion
Horizontal DeterminantsRidge and Groove DirectionDistance from the Condyles
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Balancing
Working
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Balancing
Working
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Protrusion
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The angle between the working and idling grooves becomes greater the further the tooth is from the condyles