ESTABLISHMENT OF A EVALUATION SYSTEM OF THE EXTRA AND INTRA-ORAL VACUUM ASPIRATOR

牙科手术室的空气中含有许多在牙科手术过程中产生的悬浮微粒，如牙本质、唾液、血液、细菌和病毒等。通过口内或口外吸引器抽吸和清除这些微粒是为患者和牙科工作人员创造良好舒适环境的关键步骤。市场上出现了各种各样的牙科吸引器，但对吸气器的特性知之甚少。目前，各生产厂家都推出了自己的标准，结果如下.电、机械性能：口腔外负压吸引器（EOVA）的风速为3.2-3.70 m^3/min，相当于喷射式负压吸引器的10200倍，相当于口腔内负压吸引器的22倍。用噪声计测量了EOVA的抽吸噪声。在所检查的抽吸器中，常规型在A模式和C模式之间有很大的差异，也就是说， 关于我们 传统的吸气器分布在低频范围内。总体上，大多数新型吸引器在EOVA闭合时的峰值电流为7.1-19.7 A，稳定期峰值电流为常规吸引器的30-37 A的1.4-2.0倍.对吸引器在临床应用中的总体评价采用每一定体积空气中的颗粒数作为牙体预备过程中产生的颗粒的标志。结果，在“0.3 μ m颗粒”中分别增加了7.7倍，在“0.5 μ m颗粒”中增加了53倍，在“1 μ m颗粒”中增加了151倍，在“2 μ m颗粒”中增加了127倍，在“5 μ m颗粒”中增加了28倍，在使用EOVA和艾奥纳两者的情况下，大于0.5 μ m的颗粒已经减少到制备之前的颗粒数量的水平。EOVA对“5 μ m颗粒”的吸除效果优于IOVA。少

Air of the dental operating room is contaminated with airborne particles, produced during the dental operation, such as dentine tip, saliva, blood, bacteria and virus.Suction and removal of these particles through the extra-oral or intra-oral aspirator is a crusial procedure to prepare sound and comfortable environment of patients and dental staffs.Various kinds of dental aspirators have appeared on our market, but little is known about the characteristics of the aspirators. At the moment each producer introduced its own standard.The results were as follows.1. Electrical and mechanical propertiesWind velocity of the extra-oral vacuum aspirator (EOVA) was 3.2-3.70 m^3/min. This velocity corresponded to 10200 times that of the ejector, and was 22 times that of the intra-oral vacuum aspirator (IOVA).Suction noise of the EOVA was measured using a noise meter.Among the aspirators examined the conventional type showed large difference between A mode and C mode, Namely this means the noise of … More a conventional aspirator distributed in the low frequency range. On the whole, most of the new type aspirators showed no difference in these values.Peak current at the closure of the EOVA was 7.1-19.7 A in the new types, and was 1.4-2.0 times current at the stable phase, though peak current was 30-37 A in the conventional type.2. The total evaluation of the aspirator in the clinical practiceThe effect of the aspirator was examined. The number of particles per a definite volume of air was adopted as the marker of the particles produced during the tooth preparation. As the result, there were 7.7 times increase in the '0.3mum particle', 53 times increase in the '0.5mum particle', 151 times increase in the '1mum particle', 127 times increase in the '2mum particle', 28 times increase in the '5mum particle', respectively, as compared with the number of particles before the preparation.In the case of using both of EOVA and IONA,particles more than 0.5mum' has decreased to the level of the number of the particle before the preparation. The EOVA showed higher effectiveness on sucking '5mum particle' than the IOVA. Less