Romeo Umberto, Del Vecchio Alessandro, Palaia Gaspare, Tenore Gianluca, Visca Paolo, Maggiore Claudia
Department of Odontostomatological Science, Sapienza University of Rome, Rome, Italy.
Braz Dent J. 2009;20(2):162-8. doi: 10.1590/s0103-64402009000200013.
The aim of this study was to compare the peripheral bone damage induced by different cutting systems. Four devices were tested: Er:YAG laser (2.94 mm), Piezosurgery, high-speed drill and low-speed drill. Forty-five bone sections, divided into 9 groups according to different parameters, were taken from pig mandibles within 1 h post mortem. Specimens were fixed in 10% buffered formalin, decalcified and cut in thin sections. Four different parameters were analyzed: cut precision, depth of incision, peripheral carbonization and presence of bone fragments. For statistical analysis, the Kruskal-Wallis test was applied to assess equality of sample medians among groups. All sections obtained with the Er:YAG laser showed poor peripheral carbonization. The edges of the incisions were always well-shaped and regular, no melting was observed. Piezosurgery specimens revealed superficial incisions without thermal damage but with irregular edges. The sections obtained by traditional drilling showed poor peripheral carbonization, especially if obtained at lower speed. There was statistically significant differences (p<0.01) among the cutting systems for all analyzed parameters. Er:YAG laser, gave poor peripheral carbonization, and may be considered an effective method in oral bone biopsies and permits to obtain clear and readable tissue specimens.
本研究的目的是比较不同切割系统引起的外周骨损伤。测试了四种设备：铒激光（2.94毫米）、压电手术、高速钻和低速钻。在猪死后1小时内从猪下颌骨获取45个骨切片，根据不同参数分为9组。标本用10%缓冲福尔马林固定，脱钙并切成薄片。分析了四个不同参数：切割精度、切口深度、外周碳化和骨碎片的存在。为进行统计分析，应用Kruskal-Wallis检验来评估各组样本中位数的相等性。用铒激光获得的所有切片外周碳化情况较差。切口边缘总是形状良好且规则，未观察到熔化现象。压电手术标本显示切口表浅，无热损伤，但边缘不规则。传统钻孔获得的切片外周碳化情况较差，尤其是低速钻孔时。所有分析参数在切割系统之间均存在统计学显著差异（p<0.01）。铒激光外周碳化情况较差，可被认为是口腔骨活检的一种有效方法，并且能够获得清晰可读的组织标本。
