de Brito Alencar David Saldanha, Janini Ana Cristina Padilha, Pelepenko Lauter Eston, Moraes Brenda Fornazaro, Neto Francisco Haiter, Duarte Marco Antonio Hungaro, Marciano Marina Angélica
Department of Restorative Dentistry, Endodontics, Piracicaba Dental School, State University of Campinas, Piracicaba, Brazil.
Department of Oral Diagnosis, Radiology, Piracicaba Dental School, State University of Campinas, Piracicaba, Brazil.
Restor Dent Endod. 2025 Aug;50(3):e25. doi: 10.5395/rde.2025.50.e25. Epub 2025 Jul 15.
Endodontic retreatment aims to address treatment failure through the removal of root canal filling materials. This in vitro study evaluated the presence of filling material remnants in the mesial root canals, specifically focusing on the isthmuses, of mandibular molars after retreatment.
One hundred extracted mandibular molar mesial roots with isthmuses were prepared with an R25 file, obturated with one of five calcium silicate-based sealers (BioRoot RCS [Septodont], MTApex [Ultradent Products Inc.], EndoSequence BC Sealer HiFlow [Brasseler USA], Bio-C Sealer [Angelus]) or an epoxy resin-based sealer (AH Plus Jet [Dentsply Maillefer]), all stained with rhodamine B, and stored at 37ºC for 30 days to allow for setting. Retreatment was subsequently performed using R40 and XP-endo Finisher R instruments (FKG Dentaire) with 2.5% sodium hypochlorite irrigation. The presence of remaining filling material was then assessed using confocal microscopy, and setting times were tested per ISO 6876:2012.
AH Plus Jet showed the most remnants at 2 mm and the longest retreatment time. Calcium silicate-based sealers exhibited prolonged setting times under dry conditions, with EndoSequence BC Sealer HiFlow showing a particularly extended setting period.
Despite retreatment, residues remained in all canals and isthmus regions, particularly Bio-C Sealer and AH Plus Jet in apical areas, emphasizing the difficulty of complete removal and the persistence of filling material.
根管再治疗旨在通过去除根管充填材料来解决治疗失败的问题。这项体外研究评估了再治疗后下颌磨牙近中根管，特别是峡部中充填材料残余物的存在情况。
用R25锉对100颗有峡部的拔除下颌磨牙近中根进行预备，用五种硅酸钙类封闭剂（BioRoot RCS [Septodont公司]、MTApex [Ultradent Products公司]、EndoSequence BC Sealer HiFlow [美国Brasseler公司]、Bio-C Sealer [Angelus公司]）或一种环氧树脂类封闭剂（AH Plus Jet [登士柏迈福公司]）进行充填，所有封闭剂均用罗丹明B染色，并在37℃下储存30天以使其凝固。随后使用R40和XP-endo Finisher R器械（FKG Dentaire公司）并以2.5%次氯酸钠冲洗进行再治疗。然后使用共聚焦显微镜评估剩余充填材料的存在情况，并按照ISO 6876:2012测试凝固时间。
AH Plus Jet在2毫米处显示出最多的残余物且再治疗时间最长。硅酸钙类封闭剂在干燥条件下凝固时间延长，EndoSequence BC Sealer HiFlow的凝固期尤其延长。
尽管进行了再治疗，但所有根管和峡部区域仍有残留物，尤其是根尖区域的Bio-C Sealer和AH Plus Jet，这凸显了完全去除的困难以及充填材料的残留情况。
