THE EFFECT OF THE STERILIZATION OF THE AIR-TURBINE HANDPIECES

空气涡轮机手机灭菌的效果

• 批准号: 07672067
• 负责人: TAMAZAWA Kaoru
• 金额: $ 1.34万
• 依托单位: TOHOKU UNIVERSITY
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (C)
• 财政年份: 1995
• 资助国家: 日本
• 起止时间: 1995 至 1996
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-07672067/
• 关键词: DENTAL HANDPIECE; GROSS CONTAMINATION; AUTOCLAVE; BEARING; POWER SPECTRUM; PLASMA; 歯科用タービン; 滅菌; 回転数

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

1. 高压灭菌对空气涡轮手机轴承的影响牙科器械中，牙科空气涡轮手机（THP）的消毒存在特殊困难。其困难在于其复杂、精密的机械结构、购买额外套件以填补消毒周期中的空缺的成本以及高压灭菌过程缩短其使用寿命。本研究的目的是阐明八种THP的精密机械结构，并评估THP在反复高压灭菌（121°C，15min）后特性的变化。结果如下：1）每个轴承由一个外圈、一个内圈、七个或八个滚珠和一个轴承滚珠的支撑件（保持器）组成。各THP的保持架形状和材质差异较大。2) 显微镜观察发现，所有THP的轴承零件表面均存在一些物质或许多小孔，部分THP存在磨损或附着变色润滑油。不同THP轴承部件的损坏情况存在较大差异（弗里德曼试验）3）通过收集转子转速与重复高压灭菌程序之间的关系来阐明高压灭菌对THP机械特性的影响，收集THP声音，通过麦克风收集THP声音并记录在磁带上，并在存储程序计算机上通过快速傅里叶变换（FFT）程序分析其功率谱。 100 次高压灭菌循环后获得的光谱在频率和最大峰值频率 (MPF) 的相对功率强度方面与所有 THP 的初始条件不同。在一些THP中，观察到MPF的变化不依赖于转子速度，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。转子声音是评估其机械状况的有用线索。2．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. Co. Ltd）的效果。1）当对全唾液污染的样本（约 10^4 至 10^6 CFU）施加 300 W 的功率时，所有 25 个培养物均为阴性。2）检查了覆盖有明胶和水的金属板上的灰化效果。该标本通过等离子处理减轻了重量。3）通过3种不同方法（等离子处理、蒸汽加热和芳族加热）处理的牙车针表面。 SEM 视图表明，100W 等离子处理 10 分钟产生了最干净的表面。总之，氧等离子体处理被认为是有用的牙科消毒器。较少的

项目成果

玉澤かほる、塚田甲、堀内博: "歯科用酸素プラズマ滅菌装置の開発" 日本歯科保存学雑誌. 39. 482-491 (1996)

Kahoru Tamazawa、Ko Tsukada、Hiroshi Horiuchi：“牙科氧等离子体灭菌装置的开发”日本保守牙科杂志 39. 482-491 (1996)。

KAORU TAMAZAWA,KOU TSUKADA AND HIROSHI HORIUCHI: "OXYGEN PLASMA TREATMENT FOR STERILIZATION IN DENTISTRY" JAPAN.J.CONSERV.DENT.39-2. 482-491 (1996)

Kaoru TAMAZAWA、KOU TSUKADA 和 HIROSHI HORIUCHI：“牙科灭菌中的氧等离子体治疗” JAPAN.J.CONSERV.DENT.39-2。

玉澤かほる,塚田甲,堀内博: "歯科用酸素プラズマ滅菌装置の開発" 日本歯科保存学雑誌. 39・2. 482-491 (1996)

Kahoru Tamazawa、Ko Tsukada、Hiroshi Horiuchi：“牙科氧等离子体消毒器的开发”日本保守牙科杂志 39・2（1996 年）。