Lumley P J
School of Dentistry, University of Birmingham, England.
Endod Dent Traumatol. 1996 Aug;12(4):197-201. doi: 10.1111/j.1600-9657.1996.tb00514.x.
The aim of this study was to investigate factors affecting the wear and cutting ability of sonic files. A model system was used and the following variables evaluated, file type; Heliosonic, Rispisonic or Shaper, load; 25, 50 or 100 grams and length of time in use; new, 30 or 60 seconds. A 3(3) full factorial analysis with two replications into the effect of the above variables on the cutting ability of the Heliosonic, Rispisonic and Shaper files powered by the MM1500 sonic instrument was performed. A new file size 25 (Heliosonic and Shaper) or No 3 (Rispisonic) was used for each cut together with water irrigation and the substrate used was 1 mm thick sections of bovine bone. All variables had a significant effect on cutting (ANOVA. p < 0.001). However examination of the F values showed that the most significant variable was load, followed by file type, and time. The most significant interaction was between file type and load followed by time and file type. The interaction between time and load was not significant (p > 0.05). The Rispisonic file was most susceptible to wear during use especially at higher loads and the Heliosonic file cut least. It is suggested that the Shaper file is the better design of the three with respect to cutting ability and wear with use.
本研究的目的是调查影响声波锉磨损和切割能力的因素。使用了一个模型系统，并对以下变量进行了评估：锉的类型（Heliosonic、Rispisonic或Shaper）、负载（25克、50克或100克）以及使用时间（新的、30秒或60秒）。对上述变量对由MM1500声波仪器驱动的Heliosonic、Rispisonic和Shaper锉的切割能力的影响进行了3（3）全因子分析，有两个重复。每次切割使用新的25号锉（Heliosonic和Shaper）或3号锉（Rispisonic），同时进行水冲洗，使用的底物是1毫米厚的牛骨切片。所有变量对切割均有显著影响（方差分析，p<0.001）。然而，对F值的检查表明，最显著的变量是负载，其次是锉的类型和时间。最显著的相互作用是锉的类型和负载之间的相互作用，其次是时间和锉的类型之间的相互作用。时间和负载之间的相互作用不显著（p>0.05）。Rispisonic锉在使用过程中最容易磨损，尤其是在较高负载下，而Heliosonic锉的切割量最少。建议就切割能力和使用中的磨损而言，Shaper锉是这三种锉中更好的设计。
