Effects of two grading techniques of zirconia material on the fatigue limit of full-contour 3-unit fixed dental prostheses.
Effects of two grading techniques of zirconia material on the fatigue limit of full-contour 3-unit fixed dental prostheses.
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氧化锆材料的两种分级技术对全轮廓三单元固定假牙疲劳极限的影响。
DOI：
10.1016/j.dental.2016.12.010
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发表时间：
2017
期刊：
影响因子：
--
通讯作者：
deMelo,RenataMarques
中科院分区：
文献类型：
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作者：
Villefort,ReginaFurbino;Amaral,Marina;Pereira,GabrielKalilRocha;Campos,TiagoMoreiraBastos;Zhang,Yu;Bottino,MarcoAntonio;Valandro,LuizFelipe;deMelo,RenataMarques
目的评价氧化锆材料的两种分级技术对全轮廓3单元固定假牙（FDP）疲劳极限的影响。方法对3Y-TZP预烧结块进行铣削，得到69个3单元FDP，分为3组（n = 23）。对照组（CTL）按照制造商的说明进行烧结和上釉。在两个实验组中，预烧结的 FDP 在烧结过程之前接受了表面二氧化硅/玻璃渗透处理。二氧化硅溶胶-凝胶组（SSG）通过溶胶-凝胶加工路线分级，而玻璃-氧化锆-玻璃组（GZG）通过搪瓷技术分级。分级组在烧结后没有得到釉层。然后将所有 FDP 用双固化树脂水泥粘合在复合基台上，嵌入聚氨酯中并在水中储存五天。疲劳试验的初始载荷是根据每组三个试件的单调试验结果计算的。为了确定疲劳极限，对每组 20 个样品进行楼梯测试（100,000 次循环/5 Hz）。结果疲劳极限（以牛顿为单位）为 CTL = 1607.27、SSG = 1824.31 和 GZG = 2006.57，Dixon 和 Mood 测试表明组间存在统计学显着差异（95% 置信区间）（GZG > SSG > CTL).意义通过两种不同的分级方法，二氧化硅和玻璃在块体氧化锆上的渗透提高了整体氧化锆FDP的疲劳极限。
ObjectiveThis study evaluated the effects of two grading techniques of zirconia material on the fatigue limit of full-contour 3-unit fixed dental prostheses (FDPs).MethodsPresintered blocks of 3Y-TZP were milled to obtain sixty-nine 3-unit FDPs, which were divided into three groups (n = 23). The control group (CTL) was sintered and glazed following manufacturer’s instructions. In the two experimental groups presintered FDPs received a surface silica/glass infiltration treatment before the sintering process. Silica sol–gel group (SSG) was graded by the sol–gel processing route, while the glass-zirconia-glass group (GZG) was graded by an enameling technique. Graded groups did not receive a glaze layer after sintering. All FDPs were then luted with a dual-curing resin cement on composite abutments, embedded in polyurethane and stored in water for five days. The initial load of the fatigue test was calculated based on the results of the monotonic testing applied on three specimens of each group. To determine the fatigue limit, 20 samples of each group were subjected to staircase testing (100,000 cycles/5 Hz).ResultsThe fatigue limits (in Newtons) were CTL = 1607.27, SSG = 1824.31, and GZG = 2006.57, and the Dixon and Mood test indicated statistically significant differences among groups (95% confidence interval) (GZG > SSG > CTL).SignificanceThe infiltration of silica and glass on bulk zirconia, by two different grading methods, increased the fatigue limits of monolithic zirconia FDPs.