What Is Metal Ceramic Restoration

Several factors can have an impact on a patient s choice between porcelain fused to metal crowns or all porcelain crowns for tooth restoration.

What is metal ceramic restoration.

Porcelain and metal vs. In order for the cast restoration to last in the oral environment and to protect the underlying tooth structure the margins between cast and tooth preparation need to be as closely adapted. The most common clinical failure in metal ceramic restoration is at the ceramo metal interface. These restorations are very strong durable and resistant to wear because the combination of porcelain and metal creates a stronger restoration than porcelain used alone.

The biggest advantage of the ceramic restoration is its permanent aesthetic quality. Generally full metal crowns require at least 0 5mm whist metal ceramic and full ceramic crowns require at least 1 2mm marginal integrity. Due to improvements in materials and the sustained demand for esthetic and metal free restorations the use of all ceramic restorations has become ubiquitous. Metal ceramic bond most important requirement for good long term performance.

Metal for coping of metal ceramic restoration the alloy must have a high melting temperature to withstand high firing temp of porcelain. 1 although there is a plethora of all ceramic systems many are becoming obsolete almost as quickly as they were introduced due to the distinct advantages of lithium disilicate and zirconia. The wide range of clinical applications for. Shoulder need more space for the porcelain chamfer or knife edge.

Another type is known as porcelain fused to metal which is used to provide strength to a crown or bridge. For the clinical longevity metal ceramic prostheses must have satisfactory bond strength between. However tooth preparation for a full coverage metal ceramic restoration is destructive of tooth substance figure 10 3 as clearance needs to be created not only for the metal but also for the opaceous ceramic and the dentine and enamel effect veneering. Posted january 14 2015 in porcelain crowns tooth restoration.

Metal ceramic and all ceramic restorations. The rationale for this restoration is to combine the strength of a metal substructure with the aesthetic qualities of dental porcelain. The bond is a result of chemisorption by diffusion between the surface oxide layer on the alloy and the porcelain. Since there is a solid connection between the masking ceramic and the metal almost no changes of color will occur in the ceramic construction.

The margin of a metal ceramic restoration is to be hidden in the gingival sulcus.