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首页> 美国卫生研究院文献>The Open Dentistry Journal >Analysis of the Performance of a Standardized Method for the Polishing of Methacrylic Resins
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Analysis of the Performance of a Standardized Method for the Polishing of Methacrylic Resins

机译：甲基丙烯酸树脂抛光标准方法性能的分析

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摘要

Adhesion of micro-organisms to resin surface may be caused by inadequate polishing. Most of the studies published in literature are relative to manually prepared samples and do not take into account that test repeatability is not guaranteed a priori since skills may change from one operator to another and the quality of the work done by the same expert operator may depend on “human” factors such as the level of attention, wrist trembling, etc.This paper aims to investigate on the efficiency and reliability of a standardized protocol for polishing methacrylic resins. For that purpose, five different methacrylic resins are considered. For each resin, 20 specimens are realized: 10 are polished by the same expert operator and 10 are polished by means of a mechanical system comprised of a milling tool, a mobile support for samples and a micrometric advance isoparallelometer. Roughness measurements are carried out with a ±0.01 µm resolution profilometer. An extensive statistical analysis is conducted on a population of 100 specimens. Two-way Analysis of Variance (ANOVA) is carried out taking the type of resin (i) and the polishing technique (ii) as predictors in order to evaluate how those variables will finally affect the roughness of the polished surface. The significance of the variable interaction term is assessed. The null hypothesis Ho where response is independent from individual factors as well as from their interaction is assumed to hold true for p-values>0.05 (interval of confidence of the 95%). Experimental data confirm that mechanical polishing leads to obtaining surfaces of much more uniform quality. In fact, statistical dispersion of roughness parameters can decrease significantly. This behavior is observed for all of the tested resins. Therefore, the new approach can eliminate the influence of “human” factors thus making it possible to assess the inherent features of each resin and compare different dental materials submitted to polishing.
机译：抛光不充分可能会导致微生物粘附到树脂表面。文献中发表的大多数研究都与手工制备的样品有关，并且没有考虑到测试的可重复性不能事先保证，因为技能可能会从一个操作员转变为另一个操作员，并且同一位专家操作员完成的工作质量可能取决于本文旨在研究甲基丙烯酸树脂抛光标准协议的效率和可靠性。为此，考虑了五种不同的甲基丙烯酸树脂。对于每种树脂，可实现20个样品：由同一位专家操作员对10个样品进行抛光，并通过机械系统对10个样品进行抛光，该机械系统包括铣削工具，样品的移动支架和测微超前等平行度仪。粗糙度测量使用分辨率为±0.01 µm的轮廓仪进行。对100个样本进行了广泛的统计分析。使用树脂类型（i）和抛光技术（ii）作为预测因子进行方差分析（ANOVA），以评估这些变量最终将如何影响抛光表面的粗糙度。评估了变量相互作用项的重要性。假设假设独立于各个因素及其相互作用的零假设Ho在p值> 0.05（95％的置信区间）时成立。实验数据证实，机械抛光可以使表面质量更加均匀。实际上，粗糙度参数的统计离散度可以显着降低。对于所有测试的树脂，都观察到此行为。因此，新方法可以消除“人为”因素的影响，从而可以评估每种树脂的固有特性，并比较提交抛光的不同牙科材料。

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