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首页> 外文期刊>Journal of prosthodontics: official journal of the American College of Prosthodontists >Fracture strength of yttria-stabilized zirconium-dioxide (Y-TZP) fixed dental prostheses (FDPs) with different abutment core thicknesses and connector dimensions
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Fracture strength of yttria-stabilized zirconium-dioxide (Y-TZP) fixed dental prostheses (FDPs) with different abutment core thicknesses and connector dimensions

机译：氧化钇稳定的二氧化锆（Y-TZP）固定义齿（FDP）的断裂强度，其基台厚度和连接器尺寸不同

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Purpose: The aim of this study was to investigate the fracture strength and fracture mode of yttria-stabilized tetragonal zirconia polycrystal (Y-TZP) posterior three-unit FDPs with varying connector dimension and abutment core thickness. Materials and Methods: Seventy 3-unit posterior FDP cores made of Y-TZP were divided into 7 groups with varying connector dimensions and abutment core thicknesses. All the FDPs underwent a simulated aging process including veneering, firing applications, thermocycling, and cyclic preloading. Finally the FDPs were subjected to load until fracture. Results: Significant difference was seen between the different subgroups (p < 0.05). Groups with the same connector dimension showed no significant difference in fracture strength. All fractures of the specimens involved the connector. Conclusions: Within the limitations of this in vitro study, it can be concluded that the strength of an all-ceramic Y-TZP FDP beam depends more on the connector dimension than on the thickness of the abutment core. Results indicate that the minimum abutment core thickness of an all-ceramic Y-TZP FDP might be reduced, compared to the recommended thickness, without reducing the strength of the reconstruction. This indication, however, needs to be verified by further studies before being considered generally applicable.
机译：目的：本研究的目的是研究氧化钇稳定的四方氧化锆多晶体（Y-TZP）后三单元FDP的断裂强度和断裂模式，这些FDP的连接器尺寸和基台芯厚均不同。材料和方法：将由Y-TZP制成的70个3单元后FDP芯分为7组，每个连接器尺寸和基台芯厚度都不同。所有FDP都经过了模拟的老化过程，包括饰面，燃烧应用，热循环和循环预紧。最终，FDP承受载荷直至断裂。结果：不同亚组之间存在显着差异（p <0.05）。具有相同连接器尺寸的组的断裂强度无明显差异。标本的所有断裂都与连接器有关。结论：在这项体外研究的局限性内，可以得出结论，全陶瓷Y-TZP FDP梁的强度更多地取决于连接器尺寸，而不是基台芯的厚度。结果表明，与建议的厚度相比，全陶瓷Y-TZP FDP的最小基台芯厚度可能会减小，而不会降低重建强度。但是，在被认为普遍适用之前，有待进一步研究验证该指示。

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