One of the techniques we master when doing indirect restorations is matching the tooth reduction to the thickness of the layers of ceramic the technician needs to give us our final requested esthetics. The concept is identical when completing a direct composite veneer. We will utilize multiple layers of composite, each has a different set of light properties that create opacity, hue, chroma and value. It is the combination of these layers of differing light properties that result in the final esthetics. This thickness of material must be added to the existing tooth structure and create a tooth that is correct in position, contour and proportion. Therefore, unless we are always working on undersized teeth we will need to prepare the natural tooth to create space for the correct amount of composite.
Recently I attended a program with Newton Fahl, a master at direct composite layering. He addressed the concepts of using differing types of composite ( usage and brand) due to their color and light properties, and his layering technique.
- .35mm in thickness as a default
- Provides opacity and value for the final veneer.
- Existing opaque composites range from 45-100% opacity. Using something too opaque now requires thickness to cover the density of this layer.
- Use the correct hue and chroma, and vary the value based on thickness of this layer.
- .35mm in thickness as a starting point
- Choose composite based on opacity, hue and chroma.
- Increased thickness increases chroma and opacity and decreases value.
- .5mm as a minimum
- This layer brings hue, value and translucency to the restoration
- Effects are added within this layer, such as decalcification and craze lines using composite stains.