1 / 17

OCCLUSION

OCCLUSION. Dental Anatomy & Occlusion Dent 202. Occlusion. Definition The act of closure or being closed A static morphological tooth contact relationship Includes all factors concerned with the development and stability of the masticatory system and the use of teeth in oral motor behavior

ehennings
Télécharger la présentation

OCCLUSION

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. OCCLUSION Dental Anatomy & Occlusion Dent 202

  2. Occlusion • Definition • The act of closure or being closed • A static morphological tooth contact relationship • Includes all factors concerned with the development and stability of the masticatory system and the use of teeth in oral motor behavior • Includes the integrated system of functional units involving teeth, joints and muscles of the head and neck

  3. Concepts of occlusion • Balanced occlusion • Bilateral contacts in all functional excursions • Prevent tipping of the denture bases • Not necessarily existing in natural dentition because each tooth is a separate unit • Intercuspal position • Centric occlusion Concepts developed in relation to orthodontics, complete dentures and full mouth rehabilitation • None are completely applicable to natural dentition

  4. Overview of primary occlusion • Each tooth occludes with 2 teeth of the opposing jaw • Exceptions • Mandibular central incisor • Maxillary second molar • Occlusion is supported and made more efficient after eruption of first permanent molars • Interdental spacing is important for future sufficiency of space in permanent teeth • Probability of crowding in permanent teeth is related to the amount of interdental spacing in primary dentition

  5. Primary molar relationship • Terminal plane relationship • Flush • 56% - Class I Angle’s molar relationship • 44% - Class II Angle’s molar relationship • Distal step • Class II Angle’s molar relationship • Mesial step • A greater probability for Class I Angle’s molar relationship • A lesser probability for Class III Angle’s molar relationship

  6. Primary molar relationship • Factors influencing the effect of terminal plane relationship on Angle’s molar relationship • Differential growth of the jaw • Forward growth of the mandible • Sufficient Leeway space to accommodate a mesial shift of the permanent molars • Leeway space is the amount of space gained by the difference in the mesiodistal diameter between deciduous molars and premolars

  7. Permanent occlusion • Anteroposterior relationship • Incisors: Class I, II, III • Canine: Class I, II, III • Molars: Angle’s Class I, II, III • Faciolingual relationship • Premolars • Molars

  8. Incisal relationship • Class I • Class II • Class III • Overjet • Reverse overjet • Overbite

  9. Canine relationship • Class I • Class II • Class III

  10. Molar Occlusal relationship • Angle’s Class I • Angle’s Class II • Angle’s Class III

  11. Arch Occlusal relationship

  12. Curves of occlusion • Curve of Spee • Curve of Wilson • Sphere of Monson

  13. Inclination & angulation of the roots of the teeth • Mandibular arch is wider than maxillary arch • Each tooth must be placed at the angle that best withstands the line of forces brought against it during function • If the tooth is placed at a disadvantage, its longevity may be at risk • Anterior teeth are placed at a disadvantage

  14. Antagonists • With the exception of mandibular incisors and maxillary third molars, each tooth contacts two antagonist teeth in the opposing arch • Loss of one tooth keeps the adjacent tooth in contact with opposing antagonist • Mesial or distal drifting into the space disturbs occlusal contact with antagonist teeth

  15. Centric stops • Lingual cusp tips of maxillary posterior make contact with opposing fossae and marginal ridges of mandibular posterior teeth • Buccal cusp tips of mandibular posterior make contact with opposing fossae and marginal ridges of maxillary posterior teeth • Lingual cusps of maxillary posterior teeth and buccal cusps of mandibular posterior teeth are called “supporting cusps” • Areas of occlusal contact that a supporting cusp make with opposing teeth in centric occlusion are “centric stops” • The tip of that cusp is also a centric stop • Knowledge of centric stops are important in restorative dentistry

  16. Movements away from centric occlusion • Lateral • Working side • Non-working side • In complete dentures • Balancing side • Non-balancing side • Movement in TMJ • Tooth guidance • Group function • Canine guidance • Protrusive • Incisal guidance • Retrusive • The most retrusive position is the centric occlusion in complete dentures

More Related