Butignon Luis Eduardo, de Almeida Basílio Mariana, Santo Julia Sgavioli, Arioli Filho João Neudenir
Int J Oral Maxillofac Implants. 2016 Sep-Oct;31(5):1017-22. doi: 10.11607/jomi.4477.
Little information is available in the literature regarding the accuracy of marginal fit of abutments made from different materials. The aim of this study was to compare the level of vertical misfit in abutments made from different materials before and after cyclic loading.
Thirty external hexagon implants, 3.75-mm diameter and 13-mm length, were embedded in epoxy resin and divided into three groups according to abutment type (n = 10): (1) machined titanium (Ti) abutments; (2) premachined gold-alloy (Au) abutments; and (3) machined zirconia (Zr) abutments. The abutments were attached to their respective implants by titanium alloy screws at the manufacturer's recommended torque. A cyclic loading (0.5 × 10(6) cycles; 15 Hz) between 11 and 211 N was applied at an angle of 30 degrees to the long axis of the implants. Implant-abutment vertical misfits (μm) were measured at four predetermined points before and after loading with a stereomicroscope at 60× magnification. The group means were compared using a three-way repeated-measure analysis of variance (ANOVA) and Tukey test (α = .05).
The results from the ANOVA identified significant effects of the abutment type (P < .001). However, there were no significant effects of cyclic loading (P = .978) or measured surfaces (P = .955). When the abutment groups were compared regardless of cyclic loading and measured surfaces, the Au group showed the highest value of vertical misfit (14.93 ± 0.78), followed by the Ti group (8.53 ± 0.44) and the Zr group (5.64 ± 0.73), with statistically significant differences among them (P < .05).
The abutment groups showed statistically significant differences in vertical misfit. Zr abutments showed the highest accuracy in terms of marginal fit, and Au abutments showed the lowest. Cyclic loading did not significantly change the level of vertical misfit. All experimental groups presented acceptable values of marginal misfit.
关于不同材料制成的基台边缘适合度的准确性，文献中提供的信息较少。本研究的目的是比较不同材料制成的基台在循环加载前后的垂直不匹配水平。
将30颗直径3.75mm、长度13mm的外六角种植体植入环氧树脂中，并根据基台类型分为三组（n = 10）：（1）机械加工钛（Ti）基台；（2）预加工金合金（Au）基台；（3）机械加工氧化锆（Zr）基台。按照制造商推荐的扭矩，用钛合金螺钉将基台连接到各自的种植体上。以30度角对种植体长轴施加11至211N的循环加载（0.5×10⁶次循环；15Hz）。在加载前后，用60倍放大率的体视显微镜在四个预定点测量种植体 - 基台垂直不匹配度（μm）。使用三因素重复测量方差分析（ANOVA）和Tukey检验（α = 0.05）比较组均值。
方差分析结果显示基台类型有显著影响（P < 0.001）。然而，循环加载（P = 0.978）或测量表面（P = 0.955）没有显著影响。当不考虑循环加载和测量表面比较基台组时，Au组的垂直不匹配度值最高（14.93±0.78），其次是Ti组（8.53±0.44）和Zr组（5.64±0.73），它们之间存在统计学显著差异（P < 0.05）。
基台组在垂直不匹配度上显示出统计学显著差异。Zr基台在边缘适合度方面显示出最高的准确性，而Au基台显示出最低的准确性。循环加载并未显著改变垂直不匹配水平。所有实验组的边缘不匹配值均可接受。
