Preclinical dentistry II. 3
INLAYS AND ONLAYS
Indirect
reconstructions
inlays and onlays
Inlay
Rigid filling made out of oral cavity. Insertion
using luting materiál
Inlays made of metal alloys
Indications
Large defects that is not possible to restore using amalgam
or composite materials
Out of aesthetic zone
Golden alloys
Inlays made of metal alloys
contraindications
High caries risk
Small and shallow cavities
Aesthetic zone
Metal inlay
Fabrication
➢ Direct method – seldom, for large central cavities only
➢ Indirect method
Contempoprary trends
Demands on aesthetic solution are
increasing also in posterior area
Non metallic restorations
Composite
Ceramics
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Indications
Large defects that are not possible to be restored using
amalgam or composite materials
Inlay
Onlay
Overlay
Retention
Ability to face up to occlusal forces
Geometry of preparation
Angle of divergency
Optimum 6° – 20 °
Area of retention
Area of the contact of both surfaces (tooth
and restoration)
- Surface friction
- Luting material
Importance of the luting material
Metallic inlays
Zinc oxide phosphate cement
Preparation
 Standard diamond – blue:
Cavosurface margin
 Fine diamond – red or special hard metal bur
Finishing of the preparation
Overlay Schůdková korunka
Enamel must be beveled – only in outer half
Cavity for inlay II. class
 Divergent walls in occlusal cavity as well as in proximal box
 Extention for prevention
 Enamel is beveled also in occlusal part of the cavity
Impression technique
elastomers
 Dual viscosity technique
One phase
Registration of intermaxillary
relationships
Wax registration
Antagonal impression alginate
Fabrication
Preparation
Restoration
Composite and ceramic inlays
and onlays
Preparation
Cavity without any undercuts with smooth borderss. Divergency appr. 6°
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Preparation
Thickness of the material 1,5mm - 2 mm
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Preparation
 Cavosurface angle, smooth borders, slight bevel in proximal box only, not
on occlusal surface
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lenka.roubali
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Before impression
Closure of dentine tubules – adhesive treatment and flowable on the walls
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Impression
Elastomers
One phase
Registration of intermaxillary
relationships
Wax registration
Antagonal impression alginate
Registration of intermaxilary
relations
Wax
Fabrication – various procedures
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Cementation of ceramic and
composite inlays
 Adhesive cementation
- Special composite materials with lower viscosity dual curing
- Micromechanical retention
Adhesive cementation
Hard tissues – adhesive procedures: acid etching,bonding, priming)
Restoration – sandblasting or special
etching, bonding.
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kova@tiscali
.cz
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lenka.roubali
kova@tiscali
.cz
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