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What are the three parts of organic occlusion
- 1) bilateral posterior centric contact
- 2) Anterior guidance
- 3) Mutually protective occlusion scheme
What are differences between natural and complete denture occlusion?
- 1) Sensory feedback mechanism
- 2) Reaction of supporting structures to masticatory forces
- retention, stability, support
- Denture teeth move as a unit
- Non-vertical forces affect teeth dramatically
- Decreased denture tactile sensitivity
Resistance to dislodgement forces in a vertical direction away from the bearing surface
Resistance to laterally oriented dislodgement forces
Resist forces in a vertical direction towards the bearing surface
Residual ridge resorption maxillary and mandibular
- Non physiologic compression causes resorption
- Resorption in a palatal superior direction (0.1 mm/year)
- Resorption in a buccal inferior direction
- mandibular resorption is 4x maxillary loss
Consequences of tooth loss
- Residual ridge resorption (RRR)
- Various Changes in intraoral structures
- Loss of facial support and muscle tonus
- Decreased masticatory function
- Potential Psycho-social effects
Consequences of Intraoral structure changes
- Affect support and stability quality
- Affect denture manipulation during function
Amount of force decrease with masticatory function
- Natural dentition up to 175 lbs
- complete dentures 22-4 lbs
Goals of complete denture occlusion
- Decrease trauma to supporting structures
- Preservation of remaining structures
- enhance stability
- Esthetics, speech, and mastication
Why is there not one type of superior denture?
Neuromuscular control may be the most important factor for successful use under function
Why should we know functional tooth anatomy?
- Anatomic determinants: Static anatomic landmarks
- Functional determinants: Dynamic relationship during function
What line is parallel to our occlusal plane?
Why is the retromolar pad important?
- Related to natural dentition
What dictates the position of anterior teeth?
Esthetics and phonetics
How are phonetic determinants made?
- Assessment of dynamic tooth position during speech
- use wax occlusion rims and trial denture setup
- Incisal edge to wet line (F and V sounds)
- maxillary-mandibular relationship during sibilant sounds (S)
Functional determinants of denture tooth position
- Tongue function
- Neuromuscular control
- Tooth position relative to tongue
Why is occlusal plane height important?
- Critical factor in bolus control
- Meets the modiolus- the chiasma of facial muscles
- Anterior limit of occlusal table- mandibular 1st premolar
What are the problems if an occlusal plane is too high?
- Poor bolus control
- Inability to clear vestibule
- Tipping of denture base
Problems if occlusal plane is too low
- Inadequate tongue and cheek support
- Tongue biting
Problems if arch form is too narrow
- Tongue retraction and impediment
- Speech impediment
Where should we place teeth on their ridge crests? What does this improve?
- maxillary posteriors slightly buccal
- Mandibular posterior slightly lingual or directly over the ridge crest
- This centralizes forces over the denture base and stabilization
Whatwll happen if mandibular teeth are set with their central grooves too buccal?
- Destabilized denture base
- Lateral resorptive forces on the mandibular ridge