• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>The Journal of Prosthetic Dentistry >Wear of matrix overdenture attachments after one to eight years of clinical use
【24h】

Wear of matrix overdenture attachments after one to eight years of clinical use

机译：临床使用一到八年后，佩戴基质覆盖义齿的附着物

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

Statement of problem: Matrices of unsplinted attachment systems are generally reported to be the weak component of implant overdentures, often requiring frequent maintenance. Clinical wear results in reduced retention of the prosthesis, requiring activation or renewal of the matrix to restore the initial level of retention. Purpose: The purpose of this retrospective study was to measure the wear of the matrix of a ball attachment after various periods of clinical wear. Material and methods: Seventy specimens of 3 groups of matrices of ball attachments that had been in use for mean periods of 12.3 months (1Y group, n=26), 39.0 months (3Y group, n=28) and 95.6 months (8Y group, n=16) were retrieved from 35 patients (2 specimens per patient) and measured on a coordinate measuring machine equipped with a touch trigger probe. Ten unused matrices were used as controls (CTRL group). The external and internal matrix diameters and deviations from circularity were measured. For the various time periods, the decreases in matrix thickness were calculated and compared with controls. Kruskal-Wallis 1-way ANOVA by ranks, followed by the Mann-Whitney post hoc tests, were conducted to test for differences in median values among groups (α =.05). Results: For the internal upper diameter of the matrices tested, the Kruskal-Wallis and Mann-Whitney tests revealed significant differences for the 3 groups compared to the controls. For group 1Y, a significant difference (P<.001) of the internal upper diameter was found compared to the CTRL group. Compared to the controls, the nonparametric analyses for groups 3Y and 8Y showed significant differences for the internal upper diameter (P<.001) and deviations from circularity (P<.001). For groups 1Y, 3Y and 8Y, matrix thickness losses were 07, 47 and 70 μm, respectively. Conclusions: Within the limitations of this study, it was observed that one year of clinical wear had limited effect on the ball attachment matrices. Three to 8 years of clinical use resulted in a significant decrease of matrix thickness, especially at the tip of the retentive lamellae.
机译：问题陈述：据报道，无夹板的附着系统矩阵是植入义齿的薄弱环节，通常需要经常维护。临床磨损导致假体的保留减少，需要激活或更新基质以恢复初始保留水平。目的：这项回顾性研究的目的是在临床各个时期的磨损后测量球附件基质的磨损。材料和方法：3组球附件矩阵的70个样本已使用，平均周期为12.3个月（1年组，n = 26），39.0个月（3年组，n = 28）和95.6个月（8年组） ，n = 16）从35位患者（每位患者2个标本）中检索出来，并在配有触摸触发探针的坐标测量机上进行测量。十个未使用的矩阵用作控件（CTRL组）。测量了外部和内部基质的直径以及圆度偏差。对于不同的时间段，计算基质厚度的减少量并与对照进行比较。进行Kruskal-Wallis 1次方差分析，然后进行Mann-Whitney事后检验，以检验各组之间的中位数差异（α= .05）。结果：对于所测试的矩阵的内部上直径，Kruskal-Wallis和Mann-Whitney测试显示与对照组相比，三组的显着差异。对于1Y组，与CTRL组相比，发现其内部上直径存在显着差异（P <.001）。与对照组相比，第3Y组和第8Y组的非参数分析显示出内部上直径（P <.001）和圆度偏差（P <.001）有显着差异。对于1Y，3Y和8Y组，基质厚度损失分别为07、47和70μm。结论：在这项研究的局限性内，观察到一年的临床磨损对球附着基质的作用有限。三到八年的临床使用导致基质厚度显着减少，尤其是在保留性薄片的尖端。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号