Pirani C, Iacono F, Chersoni S, Sword J, Pashley D H, Tay F R, Looney S, Gandolfi M G, Prati C
Department of Dental Sciences, Alma Mater Studiorum, University of Bologna, Bologna, Italy.
Int Endod J. 2009 Nov;42(11):1015-25. doi: 10.1111/j.1365-2591.2009.01612.x.
To compare residual root-end filling material in apical root-end cavities following their removal with ultrasonic retrotips.
Thirty single-rooted teeth were filled with Thermafil and AH Plus sealer. Root-ends were resected at 90 degrees, 3 mm from the apex. Root-end cavities were prepared with diamond burs and ultrasonic retrotips and filled with one of three filling materials: group I: Retro-TC (calcium silicate-based cement), group II: IRM (Dentsply, Germany), group III: Vitrebond (3M ESPE, USA). After 30 days of storage, ultrasonic retrotips were used to remove materials from the root-end cavities. The ultrasonic application time was fixed at 60 s. Polyether impressions and replicas of the root-ends were made. Root apices and replicas were examined by one operator under a scanning electron microscope. Remnants of residual materials were evaluated using a four-level scoring system; fractures, smear layer and exposed dentinal tubules were also examined.
Forty per cent of the specimens filled with Retro-TC revealed complete removal of the material with exposure of dentinal tubules, whilst 60% contained residual cement. Twenty per cent of specimens filled with IRM were completely devoid of material, whereas 80% had retained material. Ten per cent of specimens filled with Vitrebond retained a moderate amount of material whilst 90% had substantial retention of the material. Statistically significant differences were found (P < 0.05) amongst the three groups of materials.
Retro-TC was successfully removed in 40% of cases using ultrasonics retrotips for 60 s, whereas IRM and Vitrebond specimens had evidence of retained material in 80% and 90% of all specimens respectively.
比较使用超声倒充钻去除根尖倒充腔中的残留根充材料后的情况。
30颗单根牙用热牙胶尖和AH Plus封闭剂进行充填。在距根尖3mm处将牙根末端以90度角切除。用金刚砂车针和超声倒充钻制备根尖倒充腔，并用以下三种充填材料之一进行充填：第一组：Retro-TC（硅酸钙基水门汀），第二组：IRM（德国登士柏公司），第三组：Vitrebond（美国3M ESPE公司）。储存30天后，使用超声倒充钻从根尖倒充腔中去除材料。超声作用时间固定为60秒。制作根尖的聚醚印模和复制模型。由一名操作人员在扫描电子显微镜下检查根尖和复制模型。使用四级评分系统评估残留材料的残余情况；还检查了骨折、玷污层和暴露的牙本质小管。
40%充填Retro-TC的标本显示材料被完全去除且牙本质小管暴露，而60%含有残留水门汀。20%充填IRM的标本完全没有材料残留，而80%有材料残留。10%充填Vitrebond的标本保留了适量材料，而90%有大量材料残留。三组材料之间存在统计学显著差异（P<0.05）。
使用超声倒充钻作用60秒，40%的病例中Retro-TC被成功去除，而IRM和Vitrebond标本分别在80%和90%的所有标本中有材料残留的迹象。
