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
Onlay
Overlay
Partial crown
Crown
Korunka
Root canal inlay
Root post
Stump, snag
Crown
Root canal filling
Root
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 allo
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
Fixed bridge
Replacement one or more teeth
Bridges
Abutments
Pontic
Various size:
3 members bridges, 4 members bridges, 5
members… tce
The member: abutment or pontic.
Bridges
Abutments
Full metal crown
Facet crown
Metalceramic crown
The axis must be parallel
Bridges
Pontic
Full metal
Facet
Metalceramic
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 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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