Frank R J, Antrim D D, Bakland L K
Department of Endodontics, Loma Linda University, School of Dentistry, Loma Linda, CA, USA.
Endod Dent Traumatol. 1996 Apr;12(2):100-3. doi: 10.1111/j.1600-9657.1996.tb00105.x.
Ultrasonic cavity preparations in endodontic surgery has become a popular procedure with several advantages noted: Smaller cavities, deeper and cleaner preparations, less removal of surrounding bone needed for instrumentation and less removal of root apex dentin. Concern has been raised that lines of infraction have appeared in some instances when the ultrasonic instruments have been used. We wished to examine the result of cavity preparations in root apexes using five different methods: high and slow speed handpieces, sonic instruments, and ultrasonic instruments at two power settings, medium and high levels, respectively. The results showed that all the methods produced some infractions; the high power ultrasonics produced the most infractions while the lowest numbers were associated with the slow speed handpiece and ultrasonic instruments at the medium power setting.
超声牙髓外科开髓术已成为一种常用手术，具有以下几个优点：开髓洞形较小、制备更深且更清洁、器械操作时所需去除的周围骨质较少以及根尖牙本质去除较少。有人担心，在某些情况下使用超声器械时会出现折裂线。我们希望通过以下五种不同方法来检查根尖开髓的结果：高速和低速手机、声波器械以及分别处于中、高两种功率设置的超声器械。结果显示，所有方法都会产生一些折裂；高功率超声产生的折裂最多，而低速手机和中功率设置的超声器械产生的折裂最少。
