Gutarts Rubin, Nusstein John, Reader Al, Beck Mike
Department of Endodontics and Oral Biology, The Ohio State University, Columbus, OH 43218, USA.
J Endod. 2005 Mar;31(3):166-70. doi: 10.1097/01.don.0000137651.01496.48.
This study histologically compared the in vivo debridement efficacy of hand/rotary canal preparation versus a hand/rotary/ultrasound technique in mesial root canals of vital mandibular molars. Group 1 consisted of 16 teeth prepared with a hand/rotary technique whereas group 2 consisted of 15 teeth prepared in similar fashion but followed by 1 min of ultrasonic irrigation, per canal, utilizing an ultrasonic needle in a MiniEndo unit. Five uninstrumented mandibular molars served as histologic controls. After extraction and histologic preparation, 0.5 microm cross-sections, taken every 0.2 mm from the 1- to 3-mm apical levels, were evaluated for percentage of tissue removal. Nonparametric analysis revealed mean percent canal and isthmus cleanliness values to be significantly higher for group 2 at all levels evaluated, except one. In conclusion, the 1 min use of the ultrasonic needle after hand/rotary instrumentation resulted in significantly cleaner canals and isthmuses in the mesial roots of mandibular molars.
本研究通过组织学方法比较了手用/旋转根管预备与手用/旋转/超声技术对活髓下颌磨牙近中根管的体内清创效果。第1组由16颗采用手用/旋转技术预备的牙齿组成，而第2组由15颗以类似方式预备但随后每根管使用MiniEndo超声仪中的超声针进行1分钟超声冲洗的牙齿组成。5颗未进行器械预备的下颌磨牙作为组织学对照。在拔牙和组织学处理后，从根尖1至3毫米水平每隔0.2毫米切取0.5微米的横截面，评估组织去除的百分比。非参数分析显示，在所有评估水平上，除一个水平外，第2组的根管和峡部清洁度平均百分比值均显著更高。总之，在手用/旋转器械预备后使用1分钟超声针可使下颌磨牙近中根管和峡部显著更清洁。
