Metal porcelain crown is still commonly used because of the strength of the metal and the esthetic of the porcelain. Base metal alloys that commonly used as copings of metal porcelain crowns are nickel-chromium and cobalt-chromium. Cobalt-chromium is preferable because it has better biocompatibility for patients that have allergies to nickel. The marginal gap is one of the important factors that determine the success of a restoration. This study aims to measure the marginal gap between the cervical margin of the prepared tooth and the cervical margin of a metal porcelain crown with Co-Cr coping before and after porcelain firing. Sixteen teeth that needed to be treated with metal porcelain crowns were examined at the Dental Teaching Hospital Faculty of Dentistry, Universitas Indonesia, by using a consecutive sampling method. The marginal gaps of metal porcelain crowns with Co-Cr coping before and after porcelain firing were measured with the impression replica technique at four surfaces (buccal, mesial, distal, and palatal) using an optic microscope (Olympus BX41. Statistical analyses revealed a significant difference between the marginal gaps of metal porcelain crowns before and after porcelain firing on all surfaces (p<0.05), which was clinically acceptable.
|Number of pages||4|
|Journal||Journal of International Dental and Medical Research|
|Publication status||Published - 1 Jan 2017|
- Marginal gap
- Metal porcelain crown