This study aimed to analyze the potential occurrence of dentinal defects after the removal of a root canal filling with two different sealers using Reciproc (RC) or Reciproc Blue (RB). The mesial roots of 60 mandibular molars with a Vertucci type IV configuration were selected. The samples were initially instrumented with Reciproc (R25) and then divided into the following four experimental groups according to the endodontic sealer and retreatment instrument (n = 15): BC Sealer/Reciproc (BCRC); BC Sealer/Reciproc Blue (BCRB); AH Plus/Reciproc (AHRC); and AH Plus/Reciproc Blue (AHRB). Then, the samples were scanned under micro-CT after obturation and removal of the filling material. Two analyses were conducted. First, an evaluation was performed on all the axial images, and another analysis evaluated each millimeter of the 10 mm from the apex. Dentinal defects were observed in all the samples. All of the identified defects in the images after filling material removal were present in the corresponding images after obturation. The use of AH Plus and EndoSequence BC Sealer, and filling material removal using RC and RB instruments did not induce dentinal defects.

本研究旨在分析使用 Reciproc (RC) 或 Reciproc Blue (RB) 使用两种不同的封闭剂去除根管填充物后牙本质缺陷的潜在发生。选择了具有 Vertucci IV 型构型的 60 颗下颌磨牙的近中根。样品最初使用 Reciproc (R25) 进行仪器处理，然后根据牙髓封闭剂和再处理仪器 (n = 15) 分为以下四个实验组：BC Sealer/Reciproc (BCRC)；BC Sealer/Reciproc Blue (BCRB)；AH Plus/Reciproc (AHRC)；和 AH Plus/Reciproc Blue (AHRB)。然后，在封闭和去除填充材料后，在显微 CT 下扫描样品。进行了两次分析。首先，对所有轴向图像进行评估，另一次分析评估距心尖 10 毫米的每一毫米。在所有样品中均观察到牙本质缺陷。填充材料去除后图像中所有识别出的缺陷都存在于封闭后的相应图像中。使用 AH Plus 和 EndoSequence BC Sealer，以及使用 RC 和 RB 器械去除填充材料都不会引起牙本质缺陷。