Removal of filling material using rotating or reciprocating systems with or without solvent: microCT analysis

Abstract This study evaluated by the efficacy of rotary and reciprocating systems to remove filling material by micro-CT. Sixty human canines were instrumented up to F3 by ProTaper Universal system and filled with AH Plus/ gutta-percha. Specimens were submitted to 1,200 thermal cycles, scanned by microCT SkyScan 1176 and randomly distributed in groups according to the filling material removal protocol (n = 10): ProTaper Universal, ProTaper Universal/xylol, ProTaper Next, ProTaper Next/xylol, Reciproc and Reciproc/xylol. After filling removal, specimens were analyzed by microCT to separately verify the presence of gutta-percha and sealer remnants. The data (mm3) were analyzed by two way ANOVA and Tukey´s test (5%). For the remaining gutta-percha, the use of xylol provided the highest values for Reciproc (7.60 ± 0.73), which was statistically different from the other groups (p 0.05). For the remaining sealer, xylol provided the highest values (21.25 ± 6.94) different (p摘要 本研究通过显微计算机断层扫描（micro-CT）评估了旋转式与往复式根管器械系统去除根管充填材料的效果。选取60颗人尖牙，采用ProTaper通用锉系统（ProTaper Universal）预备至F3号锉，并用AH Plus根管封闭剂/牙胶尖完成根管充填。所有标本先接受1200次热循环处理，随后使用SkyScan 1176型显微CT进行扫描，再根据充填材料去除方案随机分为6组（每组n=10）：ProTaper通用锉组、ProTaper通用锉+二甲苯组、ProTaper Next锉组、ProTaper Next锉+二甲苯组、Reciproc往复锉组及Reciproc往复锉+二甲苯组。充填材料去除后，再次通过显微CT分析，分别检测牙胶与根管封闭剂的残留情况。以立方毫米（mm³）为单位的检测数据采用双因素方差分析及Tukey检验进行统计学分析（检验水准为5%）。针对残留牙胶，二甲苯的使用在Reciproc往复锉组中得到最高残留量（7.60 ± 0.73），该组结果与其余各组差异具有统计学意义（p<0.05）。针对残留根管封闭剂，二甲苯组的残留量最高（21.25 ± 6.94），差异具有统计学意义（p