Chan C, Chao S Y
Department of Dentistry, Taichung Veterans General Hospital, Taiwan.
Zhonghua Ya Yi Xue Hui Za Zhi. 1990 Jun;9(2):61-6.
Successful endodontic therapy is based upon the classic triad of diagnosis, adequate canal preparation, and obturation. Preparation for a root canal has two major components--debridement and shaping. Debridement, or cleaning, consists of removal of necrotic intracanal dentin and organic debris, and reduction of the bacteria inside the root canal. According to the research, the endontic ultrasonic system plays a valuable and significant and synergistic role in aiding the bacteriocidal mechanisms based on the cavitation and acoustic streaming effect. The purpose of this study was to compare the antimicrobial effectiveness of two newly developed endodontic ultrasonic devices and the conventional hand-filing techniques. Eighty single root canal teeth with deep caries or apical lesions were selected and evenly divided into 4 groups. The root canals were prepared using conventional hand filing or one of two newly developed ultrasonic filing systems, ENAC and CAVI-ENDO. The contents of the root canals before and after debridement were cultured in a thioglycolate culture tube. The results showed that in the ultrasonically prepared specimens irrigated with a normal saline solution, the microbial culture numbers were significantly reduced and obviously different from those prepared by the hand instrumentation technique. The above mentioned differences were statistically significant at the level of p less than 0.05 by the McNemar test and Chi-square test.
成功的牙髓治疗基于诊断、充分的根管预备和充填这一经典三联疗法。根管预备有两个主要部分——清创和塑形。清创，即清洁，包括清除根管内坏死的牙本质和有机碎屑，并减少根管内的细菌。根据研究，牙髓超声系统基于空化和微流效应，在辅助杀菌机制方面发挥着有价值、显著且协同的作用。本研究的目的是比较两种新开发的牙髓超声设备与传统手动锉技术的抗菌效果。选择80颗患有深龋或根尖病变的单根管牙齿，并将其平均分为4组。使用传统手动锉或两种新开发的超声锉系统之一，即ENAC和CAVI - ENDO，对根管进行预备。在硫乙醇酸盐培养管中培养清创前后根管内的内容物。结果显示，在用生理盐水冲洗的超声预备标本中，微生物培养数量显著减少，且与手动器械预备技术的标本明显不同。通过McNemar检验和卡方检验，上述差异在p小于0.05的水平上具有统计学意义。
