20. single complete denture.ppt
TRANSCRIPT
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Single Complete Dentures
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Maxillary Single DenturesMore commonTeeth usually lost before their mandibular antagonists
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Mandibular Single DenturesAvoid when possibleSevere ridge resorption due to forceStress reduction should be used Processed resilient denture linerOverdentureImplant retained denture
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Single DenturesMore difficultGreater force causes: Displacement Fracture due to flexure Severe residual ridge resorption
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Single DenturesMore difficultTooth malpositions decrease stability (extrusion, tipping, rotation) Difficulty balancing
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Single Complete DentureOcclusal adjustment of natural teethReduce severe curve of Spee level supraeruptionsRecontour rotated teeth to permit contacts on flat surfaces
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Single Complete DenturesReduce cusps in shaded area, to level plane of occlusionMock adjustment can be performed on a diagnostic cast Severe Curve of SpeeSupereruption
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Avoid Single Denture Against Anterior Teeth AloneResorptionLooseningFractureCombination Syndrome
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Avoid Single Denture Against Anterior Teeth AloneFabricate a RPD for Stress DistributionMake CD & RPD at the same timeEnsures optimal occlusion
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Occlusion RimsUse to establish OVD, NOT Incisal DisplayOverbite will be incorporated when anterior teeth are set, lengthening incisal edges
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Occlusion RimsFlat Surface for Opposing TeethNo inclinesIf steps in occlusal plane, provide flat areas for opposing natural teeth
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Maxillo-Mandibular RelationsOcclusion Rims on RPD framework Opposes CD RimsCentric and eccentric records with AlluwaxOptimizes occlusion
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Maxillo-Mandibular RelationsCrowns or bridges should be waxed up against the CD tooth setupOptimizes occlusionEnsures, changes can be made
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Maxillo - Mandibular RelationsCentric RegistrationCUD usually stableExtraoral hand position if opposing natural dentition (less obtrusive)
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Setting Anterior TeethMore difficultSetting for esthetics may produce excessive overbite with natural teeth Decreases stabilityCompromised position, used to balance need for esthetics & function
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Posterior Denture Teeth Requires more adjustment to obtain stable centric contactsDenture teeth will not normally articulate well with natural dentitionPinpoint contacts/inclines, etc.
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Tip:Increase incisal pin 1mmSet posterior teethLet wax hardenReturn pin to original position Adjust occlusion until pin touches table
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Cast Metal Denture BaseUse if denture fractures repeatedlyUsual causes: Heavy forces from natural teeth Occlusal contacts on inclines Impingement on a bony midline flexing of the denture
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Denture Teeth WearMore rapid against natural teethMore frequent recallsAdjust occlusion to prevent changes in stress distribution
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Denture Teeth Wear More RapidlyNever use porcelain denture teeth Severe attrition of natural teethPrefer denture teeth to wear