Wood M, Litkowski L J, Thompson V P, Church T
Baltimore College of Dental Surgery.
J Esthet Dent. 1992 Jul-Aug;4(4):110-3. doi: 10.1111/j.1708-8240.1992.tb00675.x.
Porcelain occasionally fractures from ceramometal fixed partial dentures following final cementation. Repair of these porcelain fractures can be a challenging task. When the problem occurs on anterior teeth, it is especially difficult because the repair must not only be durable, but esthetically pleasing as well. Although composite resins can be used for some repairs, it is often difficult to match the color and texture to the surrounding intact porcelain. In addition, the bonding between the resin and porcelain is susceptible to margin leakage, which may ultimately cause an esthetic failure. Techniques involving a cemented porcelain-fused-to-metal overcasting have often been successful in restoring the fixed partial denture to form and function. Although the esthetic result of a porcelain/metal overcasting can be quite successful, retention of the overcasting is sometimes poor. The compromised retention and resistance form is due to lack of interproximal walls on the underlying fractured unit. To improve the retention of the overcasting, the following technique of tin plating the overcasting and fractured unit prior to cementing with a composite resin cement is presented.
烤瓷熔附金属固定局部义齿在最终黏固后，瓷偶尔会发生折断。修复这些瓷折裂是一项具有挑战性的任务。当问题出现在前牙时，尤其困难，因为修复不仅必须耐用，而且还要美观。虽然复合树脂可用于某些修复，但通常很难使颜色和质地与周围完整的瓷相匹配。此外，树脂与瓷之间的粘结容易出现边缘渗漏，这最终可能导致美观失败。涉及粘结烤瓷熔附金属外罩的技术通常成功地恢复了固定局部义齿的外形和功能。虽然烤瓷/金属外罩的美观效果可能相当成功，但外罩的固位有时较差。固位和抗力形受损是由于下方折裂单元缺乏邻面壁。为了提高外罩的固位，本文介绍了一种在使用复合树脂粘结剂粘结之前对外罩和折裂单元进行镀锡的技术。
