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首页> 外文期刊>The Journal of Prosthetic Dentistry >Effects of surface finish and fatigue testing on the fracture strength of CAD-CAM and pressed-ceramic crowns.
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Effects of surface finish and fatigue testing on the fracture strength of CAD-CAM and pressed-ceramic crowns.

机译：表面光洁度和疲劳测试对CAD-CAM和压制陶瓷牙冠断裂强度的影响。

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STATEMENT OF PROBLEM: All-ceramic molar crowns can be fabricated with CAD-CAM or laboratory methods with different materials, and a polished or oven-glazed surface. PURPOSE: This in vitro study determined the fracture strength of various all-ceramic crowns, with and without prior cyclic loading. MATERIAL AND METHODS: Standardized molar crowns were fabricated with a CAD-CAM machine (Cerec 2), software with machinable ceramic materials (Vita Mark II and ProCAD), and also conventional heat-pressed IPS Empress crowns fabricated at 2 dental laboratories. Groups of 40 crowns of each material were manufactured with either a polished or an oven-glazed surface finish. Cyclic loading that simulated oral conditions were performed on half of each group. Afterward, all crowns were loaded until catastrophic failure.Results. Fracture loads of the polished ProCAD crowns without prior cyclic loading was 2120 +/- 231 N, significantly higher than that of the polished Vita Mark II crowns (1905 +/- 235 N), but was not significantly different from the strength of 2 laboratory-fabricated Empress crowns. Oven-glazing of ProCAD crowns improved the fracture strength significantly, up to 2254 +/- 186 N. Prior cyclic loading decreased the strength of all tested crowns significantly, but the reduction was less for the Cerec crowns than the Empress crowns. CONCLUSION: Cerec ProCAD crowns demonstrated significantly greater strength than the Vita Mark II crowns, better resistance to cyclic loading and lower failure probability than the laboratory-fabricated IPS Empress crowns. Prior cyclic loading significantly reduced the strength of all-ceramic crowns, but had less effect on Cerec crowns than on the IPS Empress crowns. Oven-glazing of ProCAD crowns resulted in significantly higher strength and higher resistance to cyclic loading than surface polishing.
机译：问题陈述：全陶瓷磨牙冠可以通过CAD-CAM或实验室方法用不同的材料制成，并具有抛光或烤箱上光的表面。目的：这项体外研究确定了各种全瓷冠在有或没有事先循环载荷的情况下的断裂强度。材料和方法：使用CAD-CAM机器（Cerec 2），具有可加工陶瓷材料的软件（Vita Mark II和ProCAD）以及在2个牙科实验室制造的常规热压IPS Empress牙冠制造标准的磨牙冠。每种材料的40个冠状物的组都经过抛光或烤箱上光的表面处理。对每组的一半进行模拟口腔状况的循环负荷。之后，所有表冠都装满，直到发生灾难性故障。结果。没有预先循环加载的抛光ProCAD冠的断裂载荷为2120 +/- 231 N，明显高于抛光的Vita Mark II冠的断裂载荷（1905 +/- 235 N），但与2个实验室的强度没有显着差异精制的女皇冠。 ProCAD冠的烤箱玻璃显着改善了断裂强度，最高可达到2254 +/- 186N。先前的循环载荷显着降低了所有测试冠的强度，但Cerec冠的降低幅度小于Empress冠。结论：与实验室制造的IPS Empress牙冠相比，Cerec ProCAD牙冠的强度显着高于Vita Mark II牙冠，对循环载荷的抵抗力更强，失效概率更低。先前的循环载荷显着降低了全瓷冠的强度，但对Cerec冠的影响小于对IPS Empress冠的影响。与表面抛光相比，ProCAD冠的烤箱上光可显着提高强度，并提高对循环载荷的抵抗力。

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