Yilmaz Burak, L'Homme-Langlois Emilie, Beck Frank M, McGlumphy Edwin
Associate Professor, Division of Restorative and Prosthetic Dentistry, The Ohio State University College of Dentistry, Columbus, Ohio.
Resident, Division of Restorative and Prosthetic Dentistry, The Ohio State University College of Dentistry, Columbus, Ohio.
J Prosthet Dent. 2016 Jun;115(6):718-21. doi: 10.1016/j.prosdent.2015.11.001. Epub 2015 Dec 23.
Two types of mechanical torque-limiting devices (MTLD) are available: friction-style and spring-style. Limited information is available regarding the accuracy of different types of MTLDs after sterilization.
The purpose of this in vitro study was to determine the accuracy of MTLDs after sterilization.
Three new friction-style and 3 new spring-style MTLDs (Astra Tech/Dentsply, Zimmer Dental, Biohorizons, Biomet 3i, Straumann [ITI] and Nobel Biocare; n=5 per manufacturer; 30 total) were selected to evaluate their accuracy in delivering the target torque values preset by their manufacturers before and after sterilization. Target torque measurements were made with a digital torque gauge (model DFS2-R-ND; Chatillon) 10 times for each device. All MTLDs were sterilized following the manufacturers' recommendations. The sterilization procedure was repeated 100 times, and the accuracy of all MTLDs was retested. Absolute torque differences were analyzed using a repeated measures analysis of variance with instrument as the repeated factor. MTLD type (friction or spring) and MTLD status (new or autoclaved) were the independent variables. Post hoc testing was done using the Tukey method for balanced data.
No significant difference was found between the spring-style and friction-style MTLDs or within the spring-style and friction-style MTLDs before and after sterilization (P>.05).
After 100 cycles of steam autoclaving, the accuracy of spring-style and friction-style MTLDs was similar. All MTLDs fell within ±10% of the target torque value before and after sterilization.
有两种类型的机械扭矩限制装置（MTLD）：摩擦式和弹簧式。关于不同类型的MTLD在灭菌后的准确性，现有信息有限。
本体外研究的目的是确定MTLD在灭菌后的准确性。
选择3个新的摩擦式和3个新的弹簧式MTLD（Astra Tech/登士柏、Zimmer Dental、Biohorizons、Biomet 3i、士卓曼[ITI]和诺贝尔生物Care；每个制造商n = 5；共30个），以评估其在灭菌前后传递由制造商预设的目标扭矩值的准确性。使用数字扭矩计（DFS2 - R - ND型号；Chatillon）对每个装置进行10次目标扭矩测量。所有MTLD均按照制造商的建议进行灭菌。灭菌程序重复100次，并对所有MTLD的准确性进行重新测试。使用重复测量方差分析，以仪器作为重复因素，分析绝对扭矩差异。MTLD类型（摩擦式或弹簧式）和MTLD状态（新的或经高压灭菌的）为自变量。采用Tukey法对平衡数据进行事后检验。
弹簧式和摩擦式MTLD之间或弹簧式和摩擦式MTLD在灭菌前后均未发现显著差异（P>0.05）。
经过100次蒸汽高压灭菌循环后，弹簧式和摩擦式MTLD的准确性相似。所有MTLD在灭菌前后均落在目标扭矩值的±10%范围内。
