Gross K B, Overman P R, Cobb C, Brockmann S
University of Missouri-Kansas City, School of Dentistry.
J Dent Hyg. 1992 Sep;66(7):314-8.
The purposes of this study were to compare the amount of aerosols generated from ultrasonic and sonic scalers and to measure the potential depth of respiratory tract penetration. Forty subjects were randomly assigned to receive instrumentation with the magnetostrictive, piezoelectric, or air turbine scaler. The Anderson Air Sampler collected total baseline airborne microbes for 20 minutes prior to treatment and for 20 minutes during instrumentation. This cascade impactor system measures the degree of microbial penetration in a simulated respiratory system. Blood agar plates from the sampler were incubated for 24 hours at 37 degrees C. Colony forming units per cubic foot of air (CFUs/cu. ft.) were enumerated by one blind examiner using a Lab Line Colony Counter. Data for total microbial CFUs/cu.ft. and CFUs/cu.ft. by sampler level were analyzed on the log-transformed data using ANCOVA. Baseline values of airborne bacteria served as the covariate. Results showed no significant difference in mean combined total CFUs/cu.ft. for the magnetostrictive, piezoelectric, or air turbine sonic scalers. The magnetostrictive scaler generated the lowest CFUs/cu.ft. at the deepest level of penetration; however, no significant difference in level of penetration was found among the three scalers.
本研究的目的是比较超声洁牙器和声波洁牙器产生的气溶胶量，并测量呼吸道潜在的穿透深度。40名受试者被随机分配接受磁致伸缩式、压电式或空气涡轮洁牙器的器械操作。在治疗前20分钟和器械操作期间20分钟，使用安德森空气采样器收集空气中微生物的总基线数据。这种多级冲击器系统可测量模拟呼吸系统中微生物的穿透程度。将采样器采集的血琼脂平板在37℃下培养24小时。由一名盲法检查者使用Lab Line菌落计数器对每立方英尺空气中的菌落形成单位（CFU/立方英尺）进行计数。使用协方差分析对每立方英尺空气中微生物CFU总数和按采样器水平划分的CFU/立方英尺的数据进行对数转换分析。空气中细菌的基线值用作协变量。结果显示，磁致伸缩式、压电式或空气涡轮声波洁牙器每立方英尺平均合并总CFU无显著差异。在最深穿透水平，磁致伸缩式洁牙器产生的CFU/立方英尺最低；然而，三种洁牙器在穿透水平上没有发现显著差异。
