THE EFFECT OF THE STERILIZATION OF THE AIR-TURBINE HANDPIECES

1.高压灭菌对涡轮手机轴承的影响牙科器械中，涡轮手机（THP）的消毒有特殊的困难。困难在于它们的复杂、精细的机械结构、购买额外装置以在消毒周期期间填补空缺的成本以及通过高压灭菌程序缩短它们的使用寿命。本研究的目的是阐明8种THP的精细力学结构，并评价THP在反复高压灭菌（121 ℃，15 min）后的特性变化。2）显微镜下观察，所有THP的轴承部分表面均存在一些物质或多个小孔，并有磨损或粘附变色 ...更多信息 d某些THP中的润滑油。三种不同的THP在承载部件的损伤方面存在较大的差异（Freedman's test）3）为了研究高压灭菌对THP力学特性的影响，采用麦克风采集THP声信号，并记录在磁带上，利用快速傅立叶变换（FFT）分析其功率谱。存储程序计算机上的程序。在100次高压灭菌后得到的光谱中，所有THP的最大峰值频率（MPF）的频率和相对功率强度与初始条件不同。在某些THP中，MPF的变化不依赖于转子转速，这些变化表明THP的内部结构存在一定的变形，特别是在保持器中，转子声音是一个有用的线索，以评估其力学状况.氧等离子体处理的效果碳钢器械的腐蚀和器械表面残留的分解细菌物质一直是高压灭菌器的问题。本研究的目的是研究氧等离子体反应器（PR-31 Yamato Sci. 1）将300 W的功率施加于被全唾液（约10^4至10^6 CFU）污染的样本，25个培养物均为阴性。2）检查覆盖有明胶和水的金属板上的灰化效应。3）对布尔斯表面进行等离子体处理、蒸汽热处理和电弧热处理。SEM观察表明，100 W的等离子体处理10 min产生最清洁的表面。总之，氧等离子体处理被认为是有用的牙科灭菌器。少

1. The Effect of Autoclaving on the Bearing of the Air-turbine HandpiecesOf the dental instruments there are special difficulties in the disinfection of dental air-turbine handpieces (THP). The difficulty exists in their complex, delicate mechanical structure, the cost of purchasing extra sets to fill the vacancy during disinfection cycles and shortening of their useful life by autoclaving procedure. The purpose of this study is to clarify the delicate mechanical structure of eight THPs, and to evaluate the change of characteristics of THPs after repeated autoclaving (121ﾟC,15min).The results were as follows.1) Each dearing was composed of a outer ring, a inner ring, seven or eight balls and a supporter for the bearing ball (retainer). There was large difference in shape and materials of the retainer between THPs.2) The microscopic views indicated existence of some substances or many small holes in the surface of bearing part in all THPs, and some abrasion, or adhesion of the discolore … More d lubricating oil in soeme THPs. There was large difference in the damage of the bearing parts between THPs (Freedman's test)3) The THP sound was collected relationship between the rotor speed and repetitive autoclaving procedure to clarify the effect of autoclaving on the mechanical characteristics of the THP.THP sound was collected by a microphone and recorded on the magnetic tape and its power spectrum was analyzed by Fast Fourier Transformation (FFT) program on a stored program computer. The spectra obtained after 100 cycles autoclaving were different in frequency and relative power strength of the maximum peak frequency (MPF) from those of initial condition in all the THPs. In some of the THPs, change of the MPF not depending on the rotor speed was observed, those changes indicated the existence of some deformation in the internal structure of the THPs, especially in the retainer.The rotor sound is an useful clue to evaluate its mechanical condition.2. The Effect of an Oxygen Plasma TreatmentCorrosion of carbon steel instruments and the decomposed bacterial substances remaining on the surface of the instruments have been the problem with autoclave. The purpose of this study was to investigate the effect of an oxygen plasma reactor (PR-31 YAMATO Sci. Co. Ltd).1) When the power of 300 W was applied to the specimen contaminated by whole saliva (circa 10^4 to 10^6 CFU), all of the 25 cultures were negative.2) The ashed effect on the metal plate covered with gelatin and water was examined. This specimen lost weight by plasma treatment.3) The surface of the dental burs treated by 3 different methods (plasma treatment, steam heat and ary heat). The SEM views indicated that the plasma treatment of 100W for 10 min produced the cleanest surface. In conclusion, the oxygen plasma treatment was considered useful as a dental sterilizer. Less