Priya Vishnu, Shao Jiao-Jiao, Feng Fei, Zhang Qi
Department of Dentistry and Endodontics, School of Stomatology, Tongji University, Shanghai Engineering Research Center for Dental Tissue Regeneration and Restoration. Shanghai 200072, China. E-mail:
Shanghai Kou Qiang Yi Xue. 2022 Feb;31(1):6-11.
To evaluate the safety and effectiveness of passive ultrasonic irrigation(PUI) in curved root canals, and debris cleaning ability and the amount of root canal transportation of passive ultrasonic irrigation(PUI) in curved root canals.
A total of 36 mesially curved root canals of mandibular molars with a curvature above 25° were selected. The root canals were prepared with XP-endo Shaper root canal file. The samples were divided into A1 group (curved length＞3 mm, syringe irrigation), B1 group(curved length＞3 mm, PUI+K file), C1 group(curved length＞3 mm, PUI+irrisafe), A2 group (curved length＜3 mm, syringe irrigation), B2 group (curved length＜3 mm, PUI+K file), and C2 group (curved length＜3 mm, PUI+ irrisafe) (n=6). Micro-CT scans were performed on all samples before and after irrigation, and the volume increase in the root canal after irrigation and the transportation of the root canal were calculated. SPSS 22.0 software package was used to analyze the data.
In the apical area of the root canal with a curved length greater than 3 mm, the root canal volume increase in the PUI+irrisafe group was significantly greater than that of the PUI+K file and syringe irrigation (P＜0.05), and at 5 mm section, the transportation of the root canal formed by PUI+irrisafe was significantly lower than that of the PUI+K file (P＜0.05), but there was no significant difference from syringe irrigation (P＞0.05); in root canals with a curved length less than 3 mm, root canal volume increment of the file group was significantly greater than that of syringe irrigation (P＜0.05), but there was no significant difference between the root canal transportation and syringe irrigation(P＜0.05).
In root canals with larger curved length, passive ultrasonic irrigation combined with a pre-curved file can obtain a better cleaning effect, while in root canals with smaller curved length, both K file and pre-curved file with passive ultrasonic irrigation are safe and effective.
评估被动超声冲洗（PUI）在弯曲根管中的安全性和有效性，以及被动超声冲洗在弯曲根管中的碎屑清理能力和根管偏移量。
选取36个弯曲度大于25°的下颌磨牙近中弯曲根管。采用XP-endo Shaper根管锉预备根管。将样本分为A1组（弯曲长度＞3 mm，注射器冲洗）、B1组（弯曲长度＞3 mm，PUI+K锉）、C1组（弯曲长度＞3 mm，PUI+irrisafe）、A2组（弯曲长度＜3 mm，注射器冲洗）、B2组（弯曲长度＜3 mm，PUI+K锉）和C2组（弯曲长度＜3 mm，PUI+irrisafe）（n=6）。对所有样本在冲洗前后进行显微CT扫描，计算冲洗后根管内的体积增加量和根管偏移量。使用SPSS 22.0软件包进行数据分析。
在弯曲长度大于3 mm的根管根尖区，PUI+irrisafe组的根管体积增加量显著大于PUI+K锉组和注射器冲洗组（P＜0.05），在5 mm处，PUI+irrisafe形成的根管偏移量显著低于PUI+K锉组（P＜0.05），但与注射器冲洗组无显著差异（P＞0.05）；在弯曲长度小于3 mm的根管中，锉组的根管体积增加量显著大于注射器冲洗组（P＜0.05），但根管偏移量与注射器冲洗组无显著差异（P＜0.05）。
在弯曲长度较大的根管中，被动超声冲洗联合预弯锉可获得较好的清理效果，而在弯曲长度较小的根管中，K锉和预弯锉联合被动超声冲洗均安全有效。
