Folwaczny Matthias, Merkel Ute, Mehl Albert, Hickel Reinhard
Department of Operative Dentistry and Periodontology, Ludwig-Maximilians-University, Munich, Germany.
J Periodontol. 2004 Sep;75(9):1221-6. doi: 10.1902/jop.2004.75.9.1221.
This in vitro study aimed to evaluate the influence of different parameters, i.e., lateral force, instrument power setting, and the shape of the working tip, on the roughness of root surfaces following treatment with a magnetostrictive ultrasonic scaling device.
The study sample comprised a total of 102 extracted human molars, premolars, canines, and incisors. The samples were randomly divided into 10 equal units of 10 each for treatment with the ultrasonic device at a lateral force of 0.5 N and 2.0 N, a low and high instrument power setting, and with a straight and angulated shaped working tip. Twenty samples were treated manually using curets at a lateral force of 0.5 N and 2.0 N. Two samples were left untreated as controls. The mean (Ra) and maximum (Rmax) surface roughness of each sample was recorded. The statistical analysis was performed using analysis of variance (three-way ANOVA) at a level of significance of 5% (P < 0.05).
The mean surface roughness (+/-SD) using different parameters ranged from 0.6 +/- 0.1 microm to 1.8 +/- 0.3 microm. The maximum surface roughness (+/-SD) was between 4.8 +/- 1.3 microm and 17.2 +/- 4.3 microm. The mean surface roughness (+/-SD) for samples treated with curets at a lateral force of 0.5 N was 0.5 +/- 0.0 microm and 0.4 +/- 0.1 microm at 2.0 N. The maximum surface roughness (+/-SD) was 3.7 +/- 0.8 microm at 0.5 N and 3.9 +/- 1.4 microm at 2.0 N.
The findings of the present study indicate that the shape of the working tip and the lateral force significantly influence the mean and maximum surface roughness of root surfaces treated with a magnetostrictive ultrasonic scaling device. At any specific parameter, the surface roughness was significantly higher for the ultrasonic scaling device as compared to the hand curet.
本体外研究旨在评估不同参数，即侧向力、器械功率设置和工作头形状，对使用磁致伸缩超声洁治器治疗后牙根表面粗糙度的影响。
研究样本共包括102颗拔除的人类磨牙、前磨牙、尖牙和切牙。样本被随机分为10个相等的组，每组10颗，分别使用超声设备在0.5 N和2.0 N的侧向力、低和高器械功率设置以及直形和角形工作头下进行治疗。20个样本在0.5 N和2.0 N的侧向力下使用刮治器进行手动治疗。两个样本未治疗作为对照。记录每个样本的平均（Ra）和最大（Rmax）表面粗糙度。使用方差分析（三因素方差分析）进行统计分析，显著性水平为5%（P < 0.05）。
使用不同参数时的平均表面粗糙度（±标准差）范围为0.6±0.1微米至1.8±0.3微米。最大表面粗糙度（±标准差）在4.8±1.3微米至17.2±4.3微米之间。在0.5 N侧向力下使用刮治器治疗的样本平均表面粗糙度（±标准差）为0.5±0.0微米，在2.0 N时为0.4±0.1微米。最大表面粗糙度（±标准差）在0.5 N时为3.7±0.8微米，在2.0 N时为3.9±1.4微米。
本研究结果表明，工作头形状和侧向力显著影响使用磁致伸缩超声洁治器治疗的牙根表面的平均和最大表面粗糙度。在任何特定参数下，超声洁治器的表面粗糙度均显著高于手动刮治器。
