Prosthetic III.
Fixed dentures
Fixed dentures
Inlays /onlays Crowns Bridges
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
Full crown
Facet crown
Tooth
Facet crown
Anterior teeth
Metalceramic
Metalceramic
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 vestubular and oral - 0,5 mm (max 1 mm)
• Round shoulder
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
Bridges
• Abutments
• Pontic Various size:
3 members bridges, 4 members bridges, 5 members... tee
The member: abutment or pontic.
Bridges
• Abutments
Full metal crown Facet crown Metalceramic crown
The axis must be parallel
Bridges
• Pontic
Self cleaning bridge (sanitary bridge)
Contact pontic
Reduction - the area that is in contact with gingiva 1/3 of the occlusal si Occlusal reduction depends og the magnitude from 10 - 30% reduction.
Preparation
• Preparation grooves
• Occlusal reduction
• Vestibular reduction
• Oral reduction
• Proximal reduction
• Finishing and polishing
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 patern 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 out (ceramics).
Manufacturing procedure 3.rd phase in dental ofice
• The denture is tried out
• Cemented
• (zinkoxidphosphate cement, glasionomer or composite)
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