ProstheticProsthetic IVaIVa.. FixedFixed denturesdentures FixedFixed denturesdentures RestoreRestore thethe formform (and(and functionfunction)) CementedCemented on (inon (in thethe )) preparedprepared teethteeth CanCan notnot bebe removedremoved BridgesBridges AbutmentsAbutments ((crownscrowns onon abutmentabutment teethteeth)) PonticPontic VariousVarious sizesize:: 33 membersmembers bridgesbridges, 4, 4 membersmembers bridgesbridges, 5, 5 membersmembers…… etcetc TheThe membermember:: abutmentabutment oror ponticpontic.. BridgesBridges AbutmentsAbutments areare FullFull metalmetal crowncrownFullFull metalmetal crowncrown FacetFacet crowncrown MetalceramicMetalceramic crowncrown The axis must be parallel BridgesBridges PonticPontic Full metalFull metal FacetFacetFacetFacet MetalceramicMetalceramic Self cleaning bridge (sanitary bridge) Contact pontic Reduction - the area that is in contact with gingiva 1/3 of the occlusal size. Occlusal reduction depends on number of members from 10 – 30% reduction. PreparationPreparation Preparation groovesPreparation grooves Occlusal reductionOcclusal reduction Vestibular reductionVestibular reduction Oral reductionOral reduction Proximal reductionProximal reduction Finishing and polishingFinishing and polishing PreparationPreparation TheThe longlong axisaxis ofof eacheach abutmentabutment toothtooth mustmust bebe parallelparallel.. IfIf notnot thethe cementationcementation wouldwould not nenot ne possiblepossible..IfIf notnot thethe cementationcementation wouldwould not nenot ne possiblepossible.. Manufacturing procedureManufacturing procedure 1.st phase in dental ofice1.st phase in dental ofice Taking impressionTaking impression –– elastomerselastomers Antagonal impression )alginateAntagonal impression )alginate Occlusal impresionOcclusal impresion –– bite registrationbite registration (intermaxillary relationship)(intermaxillary relationship) Provisional treatmentProvisional treatment Manufacturing procedureManufacturing procedure 1.st phase in dental lab1.st phase in dental lab Plaster modelPlaster model–– the dental arch is made ofthe dental arch is made of ultrahard gypsum, the base of a stone.ultrahard gypsum, the base of a stone. The model is divided after application of guideThe model is divided after application of guideThe model is divided after application of guideThe model is divided after application of guide pinspins The antagonal model of stoneThe antagonal model of stone Mounting to the articulator (simulator)Mounting to the articulator (simulator) Manufacturing procedureManufacturing procedure 1.st phase in dental lab1.st phase in dental lab The wax pattern of the metal framework isThe wax pattern of the metal framework is manifacturedmanifactured Casted (the method of lost wax)Casted (the method of lost wax)Casted (the method of lost wax)Casted (the method of lost wax) Adapted on the modelAdapted on the model Manufacturing procedureManufacturing procedure 2.nd phase in dental ofice2.nd phase in dental ofice The framework is tried outThe framework is tried out The colour of veneering material isThe colour of veneering material is choosenchoosenchoosenchoosen Manufacturing procedureManufacturing procedure 2.nd phase in dental lab2.nd phase in dental lab The veneering material is applied on theThe veneering material is applied on the framework and polymerized ot burntframework and polymerized ot burnt (ceramics).(ceramics).(ceramics).(ceramics). Manufacturing procedureManufacturing procedure 3.rd phase in dental ofice3.rd phase in dental ofice The denture is tried outThe denture is tried out CementedCemented (zinkoxidphosphate cement, glasionomer(zinkoxidphosphate cement, glasionomer(zinkoxidphosphate cement, glasionomer(zinkoxidphosphate cement, glasionomer or composite)or composite) TemporaryTemporary prostheticprosthetic treatmenttreatment Protection of prepared teethProtection of prepared teeth –– dentindentin woundwound Keeps the abutment teeth in their positionKeeps the abutment teeth in their position Other reasonsOther reasonsOther reasonsOther reasons -- Correction of the intermaxillary relationsCorrection of the intermaxillary relations -- AestheticsAesthetics -- Disorders of TMJDisorders of TMJ MaterialMaterial AcrylicAcrylic resinresin –– dentaldental lablab SpecialSpecial resinsresins forfor directdirect fabricationfabrication in oralin oral cavitycavitycavitycavity Sequence of operationsSequence of operations I.st phase in dental officeI.st phase in dental office TakingTaking thethe imppressionimppression usingusing thethe alginatealginate impressionimpression materialmaterial (( bothboth dentaldental archesarches)) IntermaxillaryIntermaxillary relationsrelations -- waxwaxIntermaxillaryIntermaxillary relationsrelations -- waxwax I.I.stst phasephase inin dentaldental lablab -- PouringPouring thethe impressionsimpressions -- PlasterPlaster /mix/mix ofof plasterplaster andand stonestone -- ModellationModellation ofof thethe temporarytemporary ofof thethe waxwax (pink(pink modellationmodellation waxwax))(pink(pink modellationmodellation waxwax)) -- PuttingPutting ofof thethe waxwax patternpattern intointo thethe flaskflask -- ReplacementReplacement thethe waxwax withwith resinresin doughtdought -- PolymerizationPolymerization II.ndII.nd phasephase inin dentaldental officeoffice CementationCementation usingusing thethe temporarytemporary cementcement DirectDirect fabricationfabrication ofof thethe temporarytemporary crowncrown oror bridgebridge Impression before the preparationImpression before the preparation PreparationPreparation Mixing of the special resinMixing of the special resin Filling of the impressionFilling of the impressionFilling of the impressionFilling of the impression Application os prepared teetrhApplication os prepared teetrh –– thethe temporary is being formedtemporary is being formed Finishing and polishingFinishing and polishing Cementation using the temporary cementCementation using the temporary cement