Briggs P F, Gulabivala K, Setchell D J
Institute of Dental Surgery, London, UK.
Int Endod J. 1992 Jan;25(1):6-14. doi: 10.1111/j.1365-2591.1992.tb00942.x.
This in-vitro study evaluated the pattern of dentine removal when a size 25 K-file energized by the Piezon-Endo was applied to flat surfaces of dentine under standardized conditions. The effects of power setting, interfacial force between file and dentine, direction of file oscillation and operator-assisted movement were examined. Vinyl polysiloxane impressions of the instrumented surfaces revealed characteristic patterns consisting of a series of oblique crests, similar to those observed in a previous study using the Cavi-Endo. Each crest was parallel to the next and separated by a relatively constant distance. These crests were disposed along the line of contact with the file. The Reflex microscope was used to determine the height, width and separation of these crests. There were differences in the amount and pattern of dentine removal compared with the study on the Cavi-Endo. When the file was held against the dentine surface using the minimum power setting and an interfacial force of 30 g, the pattern of dentine removal was very similar to that produced by the Cavi-Endo. Increasing the power setting to the maximum recommended for endodontics produced a slight but statistically non-significant increase in dentine removal. Further increase of the power setting to the absolute maximum produced significantly deeper and wider areas of dentine removal by the apical part of the file.(ABSTRACT TRUNCATED AT 250 WORDS)
这项体外研究评估了在标准化条件下，将由超声根管治疗仪激发的25号K锉应用于牙本质平面时牙本质的去除模式。研究了功率设置、锉与牙本质之间的界面力、锉的振荡方向以及术者辅助移动的影响。对处理后的表面制作的乙烯基聚硅氧烷印模显示出由一系列斜嵴组成的特征模式，类似于先前使用根管超声治疗仪（Cavi-Endo）的研究中观察到的模式。每个嵴与下一个嵴平行，并以相对恒定的距离隔开。这些嵴沿着与锉的接触线排列。使用反射显微镜确定这些嵴的高度、宽度和间距。与根管超声治疗仪的研究相比，牙本质去除的量和模式存在差异。当使用最小功率设置和30克的界面力将锉抵住牙本质表面时，牙本质去除模式与根管超声治疗仪产生的模式非常相似。将功率设置增加到牙髓病学推荐的最大值会使牙本质去除量略有增加，但在统计学上无显著差异。将功率设置进一步增加到绝对最大值会使锉尖部的牙本质去除区域显著更深、更宽。（摘要截断于250字）
