What Is Metal Ceramic Restoration

The bond is a result of chemisorption by diffusion between the surface oxide layer on the alloy and the porcelain.

What is metal ceramic restoration.

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. Shoulder need more space for the porcelain chamfer or knife edge. Metal for coping of metal ceramic restoration the alloy must have a high melting temperature to withstand high firing temp of porcelain. Generally full metal crowns require at least 0 5mm whist metal ceramic and full ceramic crowns require at least 1 2mm marginal integrity.

The rationale for this restoration is to combine the strength of a metal substructure with the aesthetic qualities of dental porcelain. Another type is known as porcelain fused to metal which is used to provide strength to a crown or bridge. The most common clinical failure in metal ceramic restoration is at the ceramo metal interface. 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.

Metal ceramic bond most important requirement for good long term performance. The wide range of clinical applications for. What are the indications of doing a sub gingival tooth prep. The biggest advantage of the ceramic restoration is its permanent aesthetic quality.

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. For the clinical longevity metal ceramic prostheses must have satisfactory bond strength between. What is your finish line design for a metal ceramic crown in the. Posted january 14 2015 in porcelain crowns tooth restoration.

Porcelain and metal vs. Due to improvements in materials and the sustained demand for esthetic and metal free restorations the use of all ceramic restorations has become ubiquitous. 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. Several factors can have an impact on a patient s choice between porcelain fused to metal crowns or all porcelain crowns for tooth restoration.

Since there is a solid connection between the masking ceramic and the metal almost no changes of color will occur in the ceramic construction.