Determinants of Occlusion

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Introduction to Occlusion :

B. Cleghorn DMD MSc Associate Professor Dalhousie 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

Guidelines :

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

Determinants of Occlusion :

B. Cleghorn DMD MSc Associate Professor Dalhousie University Determinants of Occlusion Horizontal Determinants Ridge 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

Determinants of Occlusion :

B. Cleghorn DMD MSc Associate Professor Dalhousie University Determinants of Occlusion Horizontal Determinants Ridge and Groove Direction Balancing Side Interferences

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Balancing Working

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Balancing Working Balancing side Interference Inner inclines of maxillary MLi cusp (CHC) Inner inclines of mandibular DB cusp (CHC) Frontal View

Determinants of Occlusion :

B. Cleghorn DMD MSc Associate Professor Dalhousie University Determinants of Occlusion Horizontal Determinants Ridge and Groove Direction Working Side Interferences

PowerPoint Presentation:

Balancing Working

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Balancing Working Working side Interference Inner inclines of maxillary and mandibular cusps ( Non- CHC cusps) Outer inclines of maxillary and mandibular cusps (CHC cusps) Frontal View

Determinants of Occlusion :

B. Cleghorn DMD MSc Associate Professor Dalhousie University Determinants of Occlusion Horizontal Determinants Ridge and Groove Direction Distance 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

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