PERBEDAAN KETAHANAN FRAKTUR MAHKOTA ZIRKONIA-PORSELEN DAN PORCELAIN FUSED TO METAL DENGAN FINISHING LINE CHAMFER DAN SHOULDER

Abstract

Dental crown should be able to restore morfology, contour, and protected the remaining dental structures from further damage. Proper core and finishing line design selection is important to maintain biomechanical performance and fracture resistance of dental crowns. This research aim to evaluates fracture resistance difference of zirconia porcelain and porcelain fused to metal crowns with chamfer and shoulder finishing line designs.Twenty four porcelain crowns with core subjects were devided into four groups; zirconia porcelain crowns with chamfer and shoulder finishing line designs, and porcelain fused to metal crowns with chamfer and
shoulder finishing line designs. All subjects were tested using Universal Testing Machine (UTM) with single cyclic load until they were fractured. The data were analyzed with two-way ANOVA and post-hoc LSD.The results showed the significant difference between zirconia porcelain chamfer and shoulder finishing line with  porcelain fused to metal crown chamfer and shoulder finishing line (p<0.05), also between porcelain fused to metal chamfer finishing line and porcelain fused to metal shoulder finishing line (p<0.05). There were no significant difference  (p>0.05) between zirconia porcelain chamfer finishing line with zirconia porcelain shoulder finishing line. The conclusions are fracture resistance on zirconia porcelain crown was better than porcelain fused to metal crown. Fracture resistance on chamfer finishing line was better than shoulder finishing line.