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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
away from the bearing surface
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
Esthetics, speech, and mastication
Why is there not one type of superior denture?
may be the most important factor for successful use under function
Why should we know functional tooth anatomy?
: Static anatomic landmarks
: 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
(F and V sounds)
maxillary-mandibular relationship during
Functional determinants of denture tooth position
Tooth position relative to tongue
Why is occlusal plane height important?
Critical factor in bolus control
- 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
Problems if arch form is too narrow
Tongue retraction and 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
Dentures lecture 3