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首页> 外文期刊>The Journal of Prosthetic Dentistry >Influence of dental rotary instruments on the roughness and wettability of human dentin surfaces.
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Influence of dental rotary instruments on the roughness and wettability of human dentin surfaces.

机译：牙科旋转器械对人牙本质表面粗糙度和润湿性的影响。

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STATEMENT OF PROBLEM: Although it is known that different dental rotary instrument types produce distinct surface roughness of the axial walls which may contribute to the clinical performance of a cast restoration, the ideal roughness that produces optimum wetting at the adhesive interface is unclear. PURPOSE: The purpose of this study was to characterize the surface roughness and its influence on wettability of teeth prepared for complete veneer crowns with different dental rotary instruments. MATERIAL AND METHODS: Sixty standardized tooth preparations for complete crowns were completed using a modified milling machine on extracted human teeth with diamond, tungsten carbide finishing, and cross-cut carbide rotary instruments of similar shape (n=20). Morphological changes obtained were investigated with a surface texture analyzer. Two additional specimens from each group were treated and prepared for scanning electron microscopy. The contact angle of a drop of distilled water on each of the prepared surfaces was used as the measure of wettability with a goniometer microscope. The data were analyzed with 1-way ANOVA and Tukey's Honestly Significant Difference (HSD) test (alpha=.05). RESULTS: Surface preparation resulted in significant differences for surface topography and wettability (P<.001). The carbide burs had significantly higher mean roughness readings (SD) for all parameters: Ra (8.6 (1.9) microm), Rq (10.9 (2.2) microm), and Ry (41.1 (2.1) microm), except for the mean Rz (12.1 (3.1) microm) value, which was recorded for diamonds. The other roughness parameters for the diamond rotary instruments were intermediate. Teeth completed with carbide finishing burs produced a smoother surface Ra (1.2 (0.5) microm), Rq (1.6 (0.6) microm), Ry (6.4 (2.6) microm), and Rz (1.9 (0.6) microm). The highest mean contact angle (SD), 81.5 (9.1) degrees, was associated with diamond rotary instruments, and the lowest (75.3 (5.9) degrees) was recorded for finishing burs. The contact angle for teeth prepared with tungsten carbide burs was intermediate: 76.1 (5.9) degrees. CONCLUSIONS: The selection of dental rotary instruments for tooth preparation significantly affects surface roughness and wettability of dentin, which may influence the retention of cast restorations.
机译：问题陈述：尽管已知不同类型的牙科旋转器械会产生明显的轴向壁表面粗糙度，这可能有助于铸件修复体的临床性能，但尚不清楚在粘合剂界面产生最佳润湿性的理想粗糙度。目的：本研究的目的是表征表面粗糙度及其对使用不同牙科旋转器械准备的完整贴面牙冠的牙齿润湿性的影响。材料和方法：使用改良的铣床，在金刚石，碳化钨精加工和类似形状（n = 20）的横切硬质合金旋转仪上，对拔出的人牙完成六十个完整冠的标准化牙齿准备。用表面纹理分析仪研究获得的形态变化。每组另外两个标本经过处理并准备用于扫描电子显微镜。在每个准备好的表面上滴一滴蒸馏水的接触角用作通过测角计显微镜的润湿性的量度。使用1向ANOVA和Tukey的诚实显着性差异（HSD）检验（alpha = .05）分析数据。结果：表面处理导致表面形貌和润湿性差异显着（P <.001）。硬质合金车刀的所有参数均具有较高的平均粗糙度读数（SD）：Ra（8.6（1.9）微米），Rq（10.9（2.2）微米）和Ry（41.1（2.1）微米），平均Rz（钻石记录的12.1（3.1微米）值。金刚石旋转仪的其他粗糙度参数是中等的。用硬质合金修整钻完成的牙齿产生更光滑的表面Ra（1.2（0.5）微米），Rq（1.6（0.6）微米），Ry（6.4（2.6）微米）和Rz（1.9（0.6）微米）。与金刚石旋转仪相关联的最高平均接触角（SD）为81.5（9.1）度，而对精加工车针的最低平均接触角（SD）为75.3（5.9）度。用碳化钨磨头制备的牙齿的接触角为中等：76.1（5.9）度。结论：选择用于牙准备的牙科旋转器械会显着影响牙本质的表面粗糙度和润湿性，这可能会影响铸件修复体的保留。

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