Porcelain Repair by Dr. Bob Margeas
Dental clinicians are often faced with solving the challenge of repairing a porcelain restoration due to fracture. Whether the case is a long span bridge or just a single porcelain veneer, having the knowledge to correct this problem can be an invaluable addition to your everyday practice. Since fractures can be due to occlusion, it is important to rule out occlusal disharmonies before beginning the procedure.
The following case describes a simple method for repairing porcelain. By following this easy step-by-step approach you can achieve results that are both esthetic and long-lasting.
A 75 year old patient presented to the office with fractured porcelain off of her 5 unit bridge. She was unable to afford a new bridge so porcelain repair was the treatment of choice.
The area was isolated with Cosmedent’s GingaGuard to prevent any possibility of tissue damage following microetching and the use of hydrofluoric acid to etch the porcelain. It is important to etch the porcelain according to the manufacturer’s recommendations. The strength of the acid will affect the length of time it takes to etch the ceramic.
After etching, a silane coupling agent is applied to the porcelain for approximately 30 seconds. The next step involves placing a bonding agent (Cosmedent Complete Red Cap) and light curing for 20 seconds. Due to metal exposure, Pink Opaque is applied to neutralize the grayness of the metal. This is light cured for 20 seconds.
The Creative Color Opaque in the shade of porcelain is placed in a thin layer. In this case, A2 opaquer was chosen. Renamel Microhybrid is then placed for strength and opacity. This is light cured for 40 seconds. To create the incisal translucency, gray tint (Creative Color, Cosmedent) is placed in a very thin layer and light cured.
The final layer is Renamel Microfill shade A2. The microfill is used for translucency and its ability to maintain high polish long-term. Final contouring is accomplished with carbide burs and FlexiDiscs. Enamelize, aluminum oxide polishing paste, applied with a FlexiBuff will give the final restoration a high luster. This should create a surface as highly polished as porcelain.
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