Studies on Prevention of Contamination of Air-turbine Handpiece.

最近，已经开发了各种防污染装置。当松开空气涡轮脚踏开关时，防污染装置（PS）立即向进气管、排气管和碎屑进气管提供少量压缩空气。它在头部保持正压，并抑制污染物的渗透。抗污染空气涡轮手机（CH）有一个连接到钻头侧主轴的小圆盘和空气涡轮手机外壳周围的浅缝。本研究的目的是调查临床上的空气涡轮手机的细菌污染，以评估两种对策（PS，CH）的效果，并评估一种新设计的“空气涡轮手机净化器与吸引”的效果。新型消毒器的特点是：1.手机外表面可用80%乙醇消毒; 2.手机运行180秒，污染物可排到吸引器内，使用PS&CH后，手机内部细菌污染降至不使用时的0.2%以下。通过使用新设计的净化器，这些细菌可以在180秒内完全从手机中冲出。使用PS & CH时，进气管、排气管、芯片进气管、进水管均未检出细菌污染，提示使用新研制的PS & CH“带吸引的涡轮式手机消毒器”，可有效防止涡轮式手机污染。

Recently, various anti-contamination devices have been developed. The anti-contamination device (PS) supplies a small amount of compressed air into air feed tube, exhaust tube and chip air feed tube at once when the air-turbine foot switch is released. It keeps a positive pressure in the head and infiltration of contaminant is inhibited. The anti-contamination air-turbine handpiece (CH) had a small disc attached to the bur side spindle and shallow slits around the outer case of the air-turbine handpiece. Centrifugal force produced by this disc together with the labyrinth mechanism inhibits contaminant invasion into the inner chamber and the tube systems.The aim of this study is to investigate the bacterial contamination of air-turbine handpieces clinically, to estimate the effect of 2 countermeasures (PS,CH) and to evaluate the effect of a newly devised "air-turbine handpiece decontaminator with suction". The characteristics of the new decontaminator are follows : 1.The outer surface of the handpiece can be disinfected by 80% ethanol.2.The handpiece can be run for 180 seconds and contaminant be discharged into the suction.The use of PS&CH reduced the internal bacterial contamination to less than 0.2% of the case of non usage. These bacteria can be flashed out completely from the handpiece by 180 senconds, by using the newly devised decontaminator. No bacterial contamination in the air feed tube, exhaust tube, chip air feed tube and water feed tube was detected when PS&CH were used.It is suggested that effective prevention of air-turbine handpiece contamination is achieved by using this newly divised "air-turbine handpiece decontaminator with suction" with PS&CH.