PENGARUH DESAIN PREPARASI FINISHING LINE DAN SEMEN RESIN TERHADAP KEBOCORAN MIKRO COPING LOGAM GIGI TIRUAN CEKAT

Abstract

Finishing line chamfer and shoulder is one the marginal adaptation, takes the most important things from the restoration based of porcelain fused to metal.The purpose of this study was evaluate both chamfer, shoulder finishing line and cement resin
on microleakage of porcelain fused to metal material fixed bridge. Resin cement is often used as cementing material because it has a bond with the structure ot tooth. Adhesive and sel-adhesive resin cement being in this experiment.
This experiment uses twenty- four  samples,  extracted upper maxilary, which has beeb prapared full-coverage crown beeb diveded into 2 groups chamfer and shoulder. This sample has been prapared into chamfer (I) and shoulder (II), which first
chamfer with adhesif (Ia), chamfer self-adhesive (Ib), shoulder adhesive (IIa), shoulder self-adhesive (IIb).These samples have been  thermocycled for 25 times then soaked in 2% methylene blue. The data on penetration score using methylene blue in the axial wall of the tooth with 0-3 scale, analyzed by using Kruskal Wallis continued with Mann Whitney method.
The result of this study shows significant difference between chamfer and shouder finishing line (p<0.05). There is no significant difference between adhesive and self-adhesive resin cement (p>0.05). Chamfer finishing line with adhesive cementation
has the least microleakage. The conclusin : 1) chamfer has less microleakage than shoulder, 2) resin cement has no effect to microleakage.