Department of Conservative and Endodontic Dentistry, Nanfang Hospital, Southern Medical University, 1838 N Guangzhou Road, Guangzhou 510515, China.
Scanning. 2021 Aug 2;2021:8320234. doi: 10.1155/2021/8320234. eCollection 2021.
This study is aimed at comparing the efficacy of heat softening and ultrasonic removal of root-end gutta-percha during retrograde preparation for root apical microsurgery. Recently extracted single-rooted premolars ( = 40) were prepared with standardized endodontically treated and root-end resection and then randomly divided into four groups that received root-end cavity preparation using four different instruments: a diamond-coated ultrasonic tip (AS3D; SACTEON, Paris, France), AS3D with the modified plugger of cordless heat carrier (MSE; B&L Biotech, Bala Cynwyd, PA, USA), stainless steel ultrasonic tip (Jetip-2; B&L Biotech, Bala Cynwyd, PA, USA), or Jetip-2 with MSE. The time required for root-end preparation was recorded. The root apex samples were examined by scanning electron microscopy to assess root surface microcracks and marginal integrity. The remnants of gutta-percha on the cavity walls were evaluated using a stereomicroscope. Statistical analysis was performed using Student's -test and Wilcoxon rank-sum test ( < 0.05). Usage of MSE with Jetip-2 significantly reduced preparation time from 99.8 ± 6.8 s to 32.4 ± 1.0 s ( = 0.009), the number of microcracks from 42 to 13 ( = 0.036), and the remnants of gutta-percha from 80% to 20% ( = 0.041). Similar results were observed for AS3D with MSE. The heat softening of MSE was effective in cleaning gutta-percha, thus greatly improving the efficiency of the root-end preparation, thereby producing a root-end cavity with fewer microcracks and better marginal integrity.
本研究旨在比较热软化和超声去除根管内牙胶尖在根尖微手术逆行预备中的疗效。最近从患者口腔中拔出的单根前磨牙（=40 颗）经过标准的根管治疗和根尖切除后，随机分为四组，使用四种不同的器械进行根管末端预备：金刚石涂层超声尖端（AS3D；SACTEON，巴黎，法国）、带无绳热载体改良插销的 AS3D（MSE；B&L Biotech，Bala Cynwyd，PA，美国）、不锈钢超声尖端（Jetip-2；B&L Biotech，Bala Cynwyd，PA，美国）或带 MSE 的 Jetip-2。记录根管末端预备所需的时间。通过扫描电子显微镜观察根尖样本，评估根管表面微裂纹和边缘完整性。使用立体显微镜评估根管壁上牙胶尖的残余量。使用 Student's -test 和 Wilcoxon 秩和检验（<0.05）进行统计分析。使用 MSE 联合 Jetip-2 可将预备时间从 99.8 ± 6.8 s 显著缩短至 32.4 ± 1.0 s（=0.009），微裂纹数量从 42 个减少至 13 个（=0.036），牙胶尖残余量从 80%减少至 20%（=0.041）。AS3D 联合 MSE 也观察到了类似的结果。MSE 的热软化在清除牙胶尖方面效果显著，从而极大地提高了根管末端预备的效率，产生了微裂纹和边缘完整性更好的根管末端腔。
