slow-speed handpiece

However, the quality of cavity margin of the slow-speed handpiece group was significantly inferior to the ultrasonic Diamond tip Berutti and NiTi tip RE2 group(P=0.029)in Part 2.
第二部分中超声波金刚砂尖Berutti与镍钛尖RE2组的管腔边缘质量优于慢速手机组(P=0.029)。