[The acrylic porcelain transition. A difficult step].

The most important change in restaurative Dentistry, since the foundation of the Atneo Odontológico Mexicano, has been the popularity of the use of porcelain fused to metal restorations. The technique that is carried on with success is still the best choice, it is may times by technicians and Dentists altered in such a way that the final result is poorer than the things we use to do long time ago. The main problems in the technique are reviewed in this article.