Staggers J A, Margeson D
Department of Orthodontics Medical College of Georgia School of Dentistry, Augusta 30912.
Angle Orthod. 1993 Summer;63(2):141-4. doi: 10.1043/0003-3219(1993)063<0141:TEOSOT>2.0.CO;2.
The purpose of this study was to evaluate the effect of sterilization on the tensile strength of 0.016" beta-titanium, nickel titanium and stainless steel wires. Three common methods of sterilization--autoclaving, dry heat and ethylene oxide--were evaluated in three test trials involving zero, one and five sterilization cycles. For each of the test trials, five pieces each of 0.016" TMA, 0.016" Sentalloy and 0.016" Tru-chrome stainless steel wires were sterilized using a standard autoclave. Five other pieces of each of the same wires were sterilized in a dryclave, while an additional five pieces of each of the three wire types were sterilized using ethylene oxide. The ultimate tensile strengths of the wires were then determined using an Instron Universal Testing Machine. The data were compared for statistical differences using analysis of variance. The results showed that dry heat sterilization significantly increased the tensile strength of TMA wires after one cycle, but not after five cycles. Autoclaving and ethylene oxide sterilization did not significantly alter the tensile strength of TMA wires. Dry heat and autoclave sterilization also significantly increased the tensile strength of Sentalloy wires, but the mean strength after five sterilization cycles was not significantly different than after one cycle. Ethylene oxide sterilization of Sentalloy wires did not significantly alter the tensile strengths of that wire. There were no significant differences in the tensile strengths of the stainless steel wires following zero, one or five cycles for any of the sterilization methods.
本研究的目的是评估灭菌对0.016英寸的β钛丝、镍钛丝和不锈钢丝拉伸强度的影响。在涉及零次、一次和五次灭菌循环的三项测试试验中，对三种常用的灭菌方法——高压蒸汽灭菌、干热灭菌和环氧乙烷灭菌——进行了评估。对于每项测试试验，使用标准高压灭菌器对5根0.016英寸的TMA丝、5根0.016英寸的Sentalloy丝和5根0.016英寸的Tru-chrome不锈钢丝进行灭菌。每种相同的丝另外5根在干热灭菌器中灭菌，同时每种三种丝另外5根使用环氧乙烷灭菌。然后使用英斯特朗万能材料试验机测定丝的极限拉伸强度。使用方差分析比较数据的统计差异。结果表明，干热灭菌在一个循环后显著提高了TMA丝的拉伸强度，但在五个循环后没有提高。高压蒸汽灭菌和环氧乙烷灭菌没有显著改变TMA丝的拉伸强度。干热灭菌和高压蒸汽灭菌也显著提高了Sentalloy丝的拉伸强度，但五个灭菌循环后的平均强度与一个循环后的平均强度没有显著差异。Sentalloy丝的环氧乙烷灭菌没有显著改变该丝的拉伸强度。对于任何灭菌方法，不锈钢丝在零次、一次或五次循环后的拉伸强度没有显著差异。
