Clinic for Preventive Dentistry, Periodontology and Cariology, Center for Dental and Oral Medicine and Cranio-Maxillofacial Surgery, University of Zurich, Zürich, Switzerland.
Clin Oral Investig. 2011 Apr;15(2):241-8. doi: 10.1007/s00784-009-0379-9. Epub 2010 Feb 3.
Some laboratory studies have evaluated the oscillation mode of ultrasonic scalers. None of them recorded its influence on calculus removal and quantified dental hard tissue loss. This study aimed to compare the performance of a magnetostrictive ultrasonic instrument at different power settings in vitro in relation to the tip oscillation activity. The oscillation activity of the straight Slimline® insert in the Cavitron® ultrasonic scaling device was analyzed at five different power settings with the help of two laser vibrometers. The performance of this instrument was tested on 60 roots of human single-rooted teeth. Twelve roots each were randomly assigned to be instrumented at a given power setting. Every root was instrumented for 120 s at a standardized instrumentation force of 0.1 ± 0.05 N. In addition, another 30 periodontally involved roots with subgingival calculus were instrumented accordingly to assess the calculus removal potential. The surface characteristics after instrumentation were analyzed under scanning electron microscope. The instrumentation at minimum power setting resulted in an mean increase of the root surface roughness of 0.18 ± 0.28 compared to 0.51 ± 0.48 at maximum power setting (P = 0.0327). The loss of dental hard tissue amounted to 11.37 ± 3.64 at minimum compared to 23.37 ± 15.76 at maximum power (P = 0.0010). The higher the power setting, the more calculus was removed. The values of the latter ranged between 4.04 ± 1.87 and 11.26 ± 4.66 mm² of cleaned dentin surface area (P = 0.0065). At lower power settings, a more favorable relation between cleaning ability, loss of dentine, and surface roughness was found.
一些实验室研究已经评估了超声洁牙机的振动模式。但它们都没有记录其对结石去除的影响，也没有量化牙体硬组织的损失。本研究旨在比较 Cavitron®超声洁牙机中直的 Slimline®插入物在不同功率设置下的性能，同时分析其尖端振动活动。借助两个激光测振仪，分析了 Cavitron®超声洁牙机中 Slimline®插入物在五种不同功率设置下的振动活动。该仪器的性能在 60 个人类单根牙的根上进行了测试。每个根随机分为 12 个，每个根在给定的功率设置下进行操作。每个根用 0.1 ± 0.05 N 的标准化操作力操作 120 s。此外，根据另外 30 个牙周袋内有龈下结石的根，评估其结石去除潜力。在扫描电子显微镜下分析操作后的表面特征。在最小功率设置下操作后，根表面粗糙度平均增加了 0.18 ± 0.28，而在最大功率设置下则增加了 0.51 ± 0.48（P = 0.0327）。与最小功率（11.37 ± 3.64）相比，最大功率（23.37 ± 15.76）时牙体硬组织的损失更大（P = 0.0010）。功率设置越高，去除的结石越多。后者的值在 4.04 ± 1.87 和 11.26 ± 4.66 mm²之间，对应的清洁牙本质表面积（P = 0.0065）。在较低的功率设置下，发现清洁能力、牙本质损失和表面粗糙度之间存在更有利的关系。
