Varghese Aswathi, Nandini Suresh, Sundar Sathish, Natanasabapathy Velmurugan
Department of Conservative Dentistry and Endodontics, Faculty of Dentistry, Meenakshi Ammal Dental College and Hospital, Meenakshi Academy of Higher Education and Research, Chennai, Tamil Nadu, India.
J Conserv Dent. 2022 Nov-Dec;25(6):672-677. doi: 10.4103/jcd.jcd_352_22. Epub 2022 Oct 13.
Complete removal of gutta-percha and sealer is an important step during retreatment. The aim of this study was to assess the efficacy and time taken by full counterclockwise rotary motion of a reciprocating file in the removal of gutta-percha and BioRoot™ RCS bioceramic sealer.
Thirty-six extracted human mandibular premolars were instrumented with Mtwo rotary files and obturated using lateral condensation technique with gutta-percha and BioRoot™ RCS bioceramic sealer. The teeth were divided into three retreatment groups ( = 12) based on the kinematics used: Group I, Mtwo retreatment (Mtwo-R) files; Group II, Reciproc files used in reciprocation mode (Reciproc-R); and Group III, Reciproc files used in full counterclockwise motion (Reciproc-CCW). The efficacy of gutta-percha and bioceramic sealer removal was assessed by volume of gutta-percha removed using cone-beam computed tomography and area of remaining gutta-percha and bioceramic sealer using ImageJ software after longitudinal sectioning. Statistical analysis was done by one-way analysis of variance test and Tukey's multiple tests.
Reciproc-CCW motion was significantly efficient in the removal of gutta-percha and bioceramic sealer in comparison to Mtwo-R files and Reciproc-R. The time taken for gutta-percha and sealer removal was least for Reciproc-R (325.5 ± 101.68 seconds) and was statistically significant in comparison to the other groups.
Within the limitations of the study, Reciproc-CCW was an effective method of removal of gutta-percha and bioceramic sealer during retreatment.
在根管再治疗过程中，彻底去除牙胶和封闭剂是重要的一步。本研究的目的是评估往复锉全逆时针旋转运动在去除牙胶和BioRoot™ RCS生物陶瓷封闭剂方面的效果及所需时间。
三十六颗拔除的人下颌前磨牙用Mtwo旋转锉进行预备，采用侧向加压技术用牙胶和BioRoot™ RCS生物陶瓷封闭剂进行充填。根据所使用的运动方式将牙齿分为三个再治疗组（每组 = 12颗）：第一组，Mtwo再治疗（Mtwo-R）锉；第二组，以往复模式使用的Reciproc锉（Reciproc-R）；第三组，以全逆时针运动使用的Reciproc锉（Reciproc-CCW）。通过锥形束计算机断层扫描测量去除的牙胶体积以及使用ImageJ软件在纵向切片后测量剩余牙胶和生物陶瓷封闭剂的面积，来评估牙胶和生物陶瓷封闭剂的去除效果。采用单因素方差分析和Tukey多重检验进行统计分析。
与Mtwo-R锉和Reciproc-R相比，Reciproc-CCW运动在去除牙胶和生物陶瓷封闭剂方面显著更有效。Reciproc-R去除牙胶和封闭剂所需时间最短（325.5 ± 101.68秒），与其他组相比具有统计学意义。
在本研究的局限性范围内，Reciproc-CCW是根管再治疗过程中去除牙胶和生物陶瓷封闭剂的有效方法。
