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首页> 外文期刊>The Journal of Prosthetic Dentistry >Influence of design and mode of loading on the fracture strength of all-ceramic resin-bonded fixed partial dentures: an in vitro study in a dual-axis chewing simulator.
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Influence of design and mode of loading on the fracture strength of all-ceramic resin-bonded fixed partial dentures: an in vitro study in a dual-axis chewing simulator.

机译：设计和加载方式对全陶瓷树脂粘结固定假牙断裂强度的影响：在双轴咀嚼模拟器中的体外研究。

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STATEMENT OF PROBLEM: In a clinical study, all-ceramic resin-bonded fixed partial dentures showed a high rate of fractures within the first years of service but remained in function as cantilevered restorations. No data are available on the fracture strength of such cantilevered restorations. PURPOSE: This in vitro study evaluated the influence of design and mode of loading on the fracture strength of all-ceramic resin-bonded fixed partial dentures. MATERIAL AND METHODS: Forty-eight frameworks were copy milled using the aluminum-oxide ceramic In-Ceram, glass-infiltrated, and circularly veneered with feldspathic porcelain to replace a maxillary incisor on a test cast. The airborne particle-abraded restorations were bonded to acid-etched human abutments using composite. Twenty-four restorations used a conventional 2-retainer design and another 24 restorations used a cantilevered single-retainer design. Subgroups of 8 specimens were subjected to a quasi-static load in the direction of the long axis of the abutments (0 degrees) or in an angle of 45 degrees. Additional subgroups were subjected to dynamic loading under 45 degrees with either 50 or 25 N in a dual-axis chewing simulator until fracture. RESULTS: Mean fracture strengths, under 45-degree quasi-static loading, were between 134 and 174 N and under 0-degree loading about 233 N. Samples subjected to dynamic loading fractured after 25 to over 200,000 loading cycles. CONCLUSION: Direction of loading exhibited a significant influence on the fracture strength, regardless of the retainer design. The applied dynamic loading force, regardless of the retainer design, had a significant influence on the loading cycles until fracture.
机译：问题陈述：在一项临床研究中，全陶瓷树脂粘结的固定局部义齿在使用的头几年内显示出很高的骨折率，但仍作为悬臂式修复体起作用。没有关于这种悬臂式修复体的断裂强度的数据。目的：这项体外研究评估了设计和加载方式对全陶瓷树脂粘结固定局部义齿断裂强度的影响。材料和方法：使用氧化铝陶瓷In-Ceram，玻璃浸润，并用长石瓷圆形贴面，代替测试铸模上的上切牙，对48个框架进行仿磨。使用复合材料将空气中颗粒磨损的修复体粘结到酸蚀的人类基台上。 24个修复体使用常规的2个保持器设计，另外24个修复体使用悬臂式单个保持器设计。 8个标本的子组在基台长轴方向（0度）或45度角上承受准静态载荷。在双轴咀嚼模拟器中，其他亚组以50 N或25 N在45度以下承受动态载荷，直到断裂。结果：在45度准静态载荷下，平均断裂强度介于134和174 N之间，在0度载荷下约为233N。承受动态载荷的样品在25到200,000多次载荷循环后断裂。结论：无论保持架的设计如何，载荷的方向均对断裂强度产生重大影响。不管保持架设计如何，施加的动态加载力都会对加载周期产生重大影响，直到断裂。

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