Prosthetic III. Fixed dentures Fixed dentures * Restore the form (and function) * Cemented on (in the ) prepared teeth * Can not be removed • Fixed dentures Inlays /onlays Crowns Bridges Inlay • • • inlaysadra inlayschema Onlay • onlaysadra onlayschema Overlay overlaysadra overlayschema Partial crown • schudkkorsadra schudkkorunkaschema Crown • • •Korunka • • korunka korunkaschema Root canal inlay Root post Stump, snag Crown Root canal filling Root rootcanalinlay01 Fixed bridge * Replacement one or more teeth dotykmezičl1 Crowns •Restore the shape of a damaged tooth • •Most frequently -Replace the lost part of a tooth (caries, fracture) -Protect before damage -Anchoring of a bridge - Indications 1.Badly broken down tooth (previously restored, secondary caries, loss of vitality) 2.Fracture (large) 3.Tooth wear- erosion (chemical) • - attrition (mechanical) • - abrasion (patological) • - diseases of the hard dental • tissues •4. Changes in position of teeth • Types of crowns •Full crowns •One material (metal alloy, resin, ceramics) •resin and ceramics - jacket crowns •Facet crowns •Combination of materials •Metal alloy –resin •Metal alloy – ceramics • •Partially / full covered • Full crown * The crown The tooth Full crown * Posterior teeth Facet crown • Tooth Metal alloy Facet made of resin or composit Facet crown * Anterior teeth Facet made of ceramics Metalceramic * The crown The tooth The metal alloy Metalceramic * Posterior teeth Anterior teeth Jacket crown * Tooth Resin, ceramics Basic rules for the crown preparation * Reduction of the hard dental tissues – space for the arteficial material (restore the form as well as the function – strong enough) * * Conical form (5° - 7 ° optimal, max 15°), no undercuts!!!! No sharpe edges!!! Basic rules for the crown preparation * Cervical border – shoulder must be clear, it can. The location is: • -Supragingival -Subgingival -Gingival • Full metal crown * Occlusal reduction: 1,5 mm, following the anatomical form * Reduction vestibular and oral – 0,5 mm (max 1 mm) * Shoulderless Combined crown – facet crown * Metal construction + facet (made of acrylic or composit) * Incisal or occlusal reduction 1,5 mm * Vestibular reduction 1,5 mm * Oral reduction 0,5 mm * Round shoulder (vestib appr. 1 – 1,5 mm, oral 0,5 – 1 mm) Combined crown - metalceramic * Occlusal (incisal reduction) – 2 mm * * Vestibular and oral reduction and other 1,5 mm • * Round shoulder Jacket crown – ceramic, composit, acrylic * Occlusal (incisal reduction) – 2 mm * * Vestibular and oral reduction and other 1,5 mm • * Sharp rectangle shoulder Replacement of missing teeth •Bridges •Fixed •Removable • •Implants • • Bridges * Abutments (crowns on abutment teeth) • * Pontic • •Various size: •3 members bridges, 4 members bridges, 5 •members… etc •The member: abutment or pontic. Bridges * Abutments are * • •Full metal crown •Facet crown •Metalceramic crown • principlesof preparation The axis must be parallel Bridges * Pontic • •Full metal •Facet •Metalceramic • proplach dotykova Self cleaning bridge (sanitary bridge) Contact pontic * dotykmezičl1 mezičlenyredukce Reduction - the area that is in contact with gingiva 1/3 of the occlusal size. Occlusal reduction depends og the magnitude from 10 – 30% reduction. * mezičlen mezicleny Preparation * Preparation grooves * * Occlusal reduction * * Vestibular reduction * * Oral reduction * * Proximal reduction * * Finishing and polishing Preparation * The long axis of each abutment tooth must • be parallel. • •If not the cementation would not ne possible. • • Manufacturing procedure 1.st phase in dental ofice * Taking impression – elastomers * * Antagonal impression )alginate * * Occlusal impresion – bite registration (intermaxillary relationship) • * Provisional treatment Manufacturing procedure 1.st phase in dental lab * Plaster model– the dental arch is made of ultrahard gypsum, the base of a stone. * * The model is divided after application of guide pins * * The antagonal model of stone * * Mounting to the articulator (simulator) Manufacturing procedure 1.st phase in dental lab * The wax pattern of the metal framework is manifactured * * Casted (the method of lost wax) * * * Adapted on the model * Manufacturing procedure 2.nd phase in dental ofice * The framework is tried out * * The colour of veneering material is choosen Manufacturing procedure 2.nd phase in dental lab • •The veneering material is applied on the •framework and polymerized ot burnt •(ceramics). • • * Manufacturing procedure 3.rd phase in dental ofice * The denture is tried out * * Cemented * (zinkoxidphosphate cement, glasionomer or composite) * mustek01 mustek02 mustek03a mustek03c mustek03b * mustek04 mustek05 mustek07 mustek06 * mustek08a +mustek10 mustek14 mustek15 * mustek16 mustek19 mustek20 mustek23 Temporary prosthetic treatment * Protection of prepared teeth – dentin wound * Keeps the abutment teeth in their position * Other reasons -Correction of the intermaxillary relations • - Aesthetics • - Disorders of TMJ * * * * • Material * Acrylic resin – dental lab * * Special resins for direct fabrication in oral cavity Sequence of operations I.st phase in dental office * Taking the imppression using the alginate impression material ( both dental arches) * * Intermaxillary relations - wax • I.st phase in dental lab •- Pouring the impressions -Plaster /mix of plaster and stone •- Modellation of the temporary of the wax (pink modellation wax) -Putting of the wax pattern into the flask -Replacement the wax with resin dought -Polymerization - • II.nd phase in dental office * Cementation using the temporary cement Direct fabrication of the temporary crown or bridge * Impression before the preparation * Preparation * Mixing of the special resin * Filling of the impression * Application os prepared teetrh – the temporary is being formed * Finishing and polishing * Cementation using the temporary cement * *