Peampring Chaimongkon, Aksornmuang Juthatip, Sanohkan Sasiwimol
Department of Prosthetic Dentistry, Faculty of Dentistry, Prince of Songkla University, Hat Yai, Songkhla, Thailand.
J Conserv Dent. 2017 Jul-Aug;20(4):225-229. doi: 10.4103/JCD.JCD_130_16.
The aim of this study is to investigate the fracture load to failure and damage mode of the composite resin-veneered zirconia crowns preparing with two different zirconia surface treatments compared conventional porcelain-veneered zirconia crowns.
Metallic molar-shape dies prepared with 10° convergence angle a 1.5 mm deep chamfer finish line were used. Two groups of composite-resin-veneered zirconia crowns were prepared using different surface treatment (Group A - sandblasting and Group B - glaze-on technique). Group C (conventional porcelain-veneered zirconia crowns) was served as control. Load to failure test was performed to evaluate the fracture resistance of the crowns using a universal testing machine. One-way ANOVA was used to evaluate the differences of mean values ( < 0.05) followed by Tukey's honest significance test multiple comparisons.
The mean fracture load to failure of Group A was 1078.45 ± 72.3, Group B was 1215.68 ± 100.76, and Group C (control) was 1203.67 ± 88.05. Modes of failure are 100% bulk fracture of the core through the veneering materials for Group B and C. However, Group A showed 40% delamination of composite veneering leaving zirconia coping exposed.
Group B and C showed significant higher load to failure than Group A. Four specimens of Group A revealed the delamination of composite resin veneering.
本研究旨在调查采用两种不同氧化锆表面处理方法制备的复合树脂贴面氧化锆全冠的断裂载荷至失效情况及损伤模式，并与传统瓷贴面氧化锆全冠进行比较。
使用制备有10°聚合角和1.5mm深倒角边缘线的金属磨牙形状代型。采用不同表面处理方法制备两组复合树脂贴面氧化锆全冠（A组 - 喷砂处理，B组 - 釉质涂布技术）。C组（传统瓷贴面氧化锆全冠）作为对照。使用万能试验机进行失效载荷测试以评估全冠的抗断裂性能。采用单因素方差分析评估平均值的差异（<0.05），随后进行Tukey诚实显著性检验进行多重比较。
A组的平均断裂载荷至失效为1078.45±72.3，B组为1215.68±100.76，C组（对照组）为1203.67±88.05。B组和C组的失效模式为100%核心材料通过贴面材料的整体断裂。然而，A组有40%的复合树脂贴面分层，氧化锆基底暴露。
B组和C组的失效载荷显著高于A组。A组有四个标本显示复合树脂贴面分层。
