Department of Endodontics, Faculty of Dentistry, Estácio de Sá University, Rio de Janeiro, RJ, Brazil.
Int Endod J. 2019 May;52(5):716-724. doi: 10.1111/iej.13047. Epub 2018 Dec 13.
To evaluate the effectiveness of a solvent (eucalyptol) in improving filling material removal from canals connected by isthmuses, and the additional cleaning effect of a finishing instrument.
The mesial canals from 32 mandibular molars (Vertucci's type II morphology) were instrumented and filled with the single-cone technique using Reciproc R25 gutta-percha points (VDW, Munich, Germany) combined with Sealer 26 (Dentsply, Petrópolis, RJ, Brazil). Each root was then subjected to retreatment using the Mtwo instrument system (VDW), with or without a solvent (n = 16 per group). The volume of filling material in the canals was assessed by micro-computed tomographic (micro-CT) scans taken before and after retreatment. Canals with remnants of filling material received a supplementary procedure with the XP-endo Finisher R instrument (FKG Dentaire, La Chaux-de-Fonds, Switzerland), with or without eucalyptol, and another micro-CT scan was taken. All retreatment procedures were performed inside a cabinet under a controlled temperature (37 °C). Filling material removal was evaluated in the 5-mm apical canal system for the canal+isthmus space or the isthmus alone. Statistical analyses were performed to compare the removal of filling material with and without eucalyptol, and after a supplementary approach with XP-endo Finisher R. The level of significance was set at 5% for all statistical tests (P < 0.05).
The amount of filling material removed from the canal+isthmus with Mtwo instruments was 83.2% when no solvent was used and 83.8% using the solvent (P > 0.05). When the isthmus area was evaluated separately, most specimens were associated with a reduction in the filling material, with no significant difference between the groups with or without using a solvent (P > 0.05). The supplementary step with XP-endo Finisher R significantly improved removal of filling material from both canal and isthmus area (P < 0.05), regardless of the use of a solvent (P > 0.05).
The use of eucalyptol did not improve filling material removal from Vertucci's type II molar mesial canals and isthmuses. XP-endo Finisher R significantly enhanced removal of filling material from the canals and isthmuses.
评估溶剂（桉树油）在改善连接峡部的根管内填充材料去除方面的效果，以及对根管锉的附加清洁效果。
32 颗下颌磨牙（Vertucci Ⅱ型形态）的近中根管采用 Reciproc R25 牙胶尖（VDW，慕尼黑，德国）和 Sealer 26（Dentsply，Petrópolis，RJ，巴西）进行单次根管锉技术充填。然后，每根根管均采用 Mtwo 器械系统（VDW）进行再治疗，其中一组使用溶剂（n=16），另一组不使用。通过再治疗前后的微计算机断层扫描（micro-CT）评估根管内的填充材料体积。对于仍有残留填充材料的根管，使用 XP-endo Finisher R 器械（FKG Dentaire，La Chaux-de-Fonds，瑞士）进行附加处理，无论是否使用桉树油，然后再进行一次 micro-CT 扫描。所有再治疗操作均在一个温度受控的橱柜内进行（37°C）。评估 5mm 根尖管系统中根管峡部或峡部单独的填充材料去除情况。使用和不使用桉树油，以及使用 XP-endo Finisher R 进行补充处理后，对去除填充材料的情况进行统计学分析。所有统计检验的显著性水平均设为 5%（P<0.05）。
不使用溶剂时，Mtwo 器械从根管峡部去除的填充材料量为 83.2%，使用溶剂时为 83.8%（P>0.05）。当单独评估峡部区域时，大多数标本与填充材料减少相关，但两组之间无显著差异，无论是否使用溶剂（P>0.05）。使用 XP-endo Finisher R 进行附加处理可显著提高根管和峡部区域的填充材料去除率（P<0.05），而与使用溶剂无关（P>0.05）。
使用桉树油并不能改善 Vertucci Ⅱ型磨牙近中根管峡部的填充材料去除效果。XP-endo Finisher R 可显著提高根管和峡部区域的填充材料去除效果。
