Plastic fillings
 The material is soft, it is cured (set) in the cavity
amalgam, composite, glassionomer, temporaries.
Rigid fillings - inlays
• The material is rigid (already cured)
Metal alloy, composite, ceramics.
Inlays made of the metal alloy
(usually precious alloys)
 Rigid fillings
 Manufactured in a dental lab
 Direct or indirect method
- Direct method rarely (class I. only)
- Indirect method (most cases)
Inlay
 Crown inlay
- a part of a clinical crown is replaced
 Root canal inlay
- The inlay is cemented into the root canal and
replaces a crown (abutment tooth – stump,
snag)
Crown inlay
Material
 Metal Alloys
 Composit
 Ceramics
Crown inlays
Indications
 A big loss of dental tissues (cusps replacemen
 Next to the crowns and bridges made of metal alloy
Inlays made of the metal alloy
Indications
 Large defects (i.e. – cusps replacement)
 Large interdental spaces
 Next to crowns and bridges made of metal alloys (risk of oral
galvanism – electric current between two metals)
Inlays made of the metal alloy
Contraindications
o High risk of dental caries
o Small and shalow cavities
o No in frontal area
Inlay
Advantages
 Better anatomic form
 Better polished
Inlay
Disadvantages
 The technology is not easy
 More time consuming
 Expensive
 Two appointments
Basic rules of preparation
 Box
 No undercuts
 Light divergence of the walls (facilitating
shape). Angle of divergency 6 – 15°
Box
No undercuts
Simple box
Facilitating shape
Inlay of metal alloy
 Direct method (class I. or V.) - rarely
 Indirect method (in most cases)
Inlay of metal alloy
 Direct method
Direct modellation in the mouth
Special wax – casting wax,
(special polymers)
Sprue pin
Investment
Method of the lost wax
Class I.
All fissures are involved
No undercuts – facilitating form
Asymetric outlines
Depth 1,5 mm
Sequence of operations
Dental office
- Preparation
- Isolation of the cavity
- Modellation of heated casting wax
- Sprue pin – the thickest part,reservoir
Dental lab
- Investment
- Casting (method of lost wax)
-Finishing
Dental office
- Cementation
Inlay of metal alloy
Indirect method
Taking of the impression
Model
Modellation of the casting wax,
(special polymers)
Sprue pin
Investment
Lost wax method
Inlay
Onlay
Overlay
Retention of rigid fillings
Against axial forces, depends on
1. Geometry of the preparation
2. Qwuality of the luting material (cement)
Taper
Retentiong/mm2
Angle of convergency
Rau G. 1994
Non metallic inlays
 Composite
 Ceramics
Indirect method
CAD CAM
lenka.roubalikova@tiscali.cz 35
Preparation
 Box
 No undercuts
 Facilitating shape – divergence of the walls appr.
6°
 No bevel
 Thickness of the material 1,5 – 2 mm
Cementation
 Adhesive materials – composite cements
 Special materials requiring acid etxhing, priming and
bonding
 Chemically or dual curing low viscosity materials
lenka.roubalikova@tiscali.cz 47
lenka.roubalikova@tiscali.cz