Classification of the fillings
Plastic
Rigid
Plastic fillings
(they are soft when being placed into
the cavity)
• The material is soft, it is cured (set) in the
cavity: amalgam, composite, glassionomer,
temporaries.
Rigid fillings - inlays
• The material is rigid when being placed into
the cavity
Metal alloy, composite, ceramics.
Inlays made of the metal alloy
(usually precious alloys)
• Rigid filling
• 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)
6 lroubalikova@gmail.com
Root canal inlay – made of metal alloy (non precious)
This inlay has two parts: root post
core – coronal part.
The core restore the crown only to the shape
for later placement the prosthetic restoration e.g. ceramic crown.
These inlays will be discussed next semester
Post
Core
General indications for crown inlays:
General indications for crown inlays:
Big lost of hard dental tissues – when the restoration of
the form and function with amalgam or composite is
not possible.
General contraindications
o High risk of dental caries (inlay is a special treatment,
when higher tendency to dental caries prosthetic
treatment is bettter)
o Small and shalow cavities
o Frontal area
Crown inlay
Material
Metal Alloys
Composit
Ceramics
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
Classification of inlays
Inlay
Classification of inlays
Onlay
Classification of inlays
Overlay
Metal inlay: sequence of operations
Direct method
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
Direct method is used in very rare cases, in the first class acc.to Black
only
Metal inlay: sequence of operations
Indirect method
Taking of the impression
Model
Modellation of the casting wax,
(special polymers)
Sprue pin
Investment
Lost wax method
Taking impression using elastomeric
materials – dual viscosity technique
Antagonal impression and wax
registration of the intermaxillary
relationships are also taken
Cementation
• For inlays made of the metal alloy the zinkoxid
cement is used.
• It is mixed into the creamy consistency
Non metallic inlays
• Composite
• Ceramics
Preparation
• Box
• No undercuts
• Facilitating shape – divergence of the walls
appr. 6°
• No bevel
• Thickness of the material 1,5 – 2 mm
Cavity for inlay made of composite or
ceramics
Preparation
Tapered diamonds are used
Indirect method
Indirect method – with impression (see above)
CAD CAM - the cavity is scanned on the model
or in oral cavity.
Taking impression using elastomeric
materials – dual viscosity technique
Antagonal impression and wax
registration of the intermaxillary
relationships are also taken
lenka.roubalikova@tiscali.cz 33
Methods of fabrication
Fabrication of these restorations is varioue
because of many various materials and
technologies.
These technologies will not be discussed.
Fabrication of the composite inlays
Cementation
 Adhesive materials – composite cements
 Special materials requiring acid etching, priming
and bonding
 Chemically or dual curing low viscosity materials
Cementation
• Acid etching
• Washing
• Priming
• Bonding
• Application of the cement
• Curing (during curing the border is covered with
glycerin in order to avoid the inhibition layer – this is a
superficial part of composite cement that is not
completely cured due to oxygen in air)
• Access removimng
• Polishing
Cementation using composite cements
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Inlays on the model and in oral cavity