Bernabé Pedro Felício Estrada, Gomes-Filho João Eduardo, Bernabé Daniel Galera, Nery Mauro Juvenal, Otoboni-Filho José Arlindo, Dezan Eloi, Cintra Luciano Tavares Angelo
Department of Restorative Dentistry, Araçatuba Dental School, UNESP - Univ Estadual Paulista, Araçatuba, SP, Brazil.
Braz Dent J. 2013;24(2):107-10. doi: 10.1590/0103-6440201301973.
Despite the excellent properties of mineral trioxide aggregate (MTA), the condensation technique may have some influence in its sealing ability. The purpose of this study was to compare the sealing ability of sonic and ultrasonic setting of MTA. Thirty-four extracted human teeth had their canals prepared and filled with Sealapex sealer and gutta-percha using the active lateral condensation technique. The teeth were rendered waterproof and apicoectomy performed at 3 mm from the apex. Root-end cavities (3.0 mm deep and 1.4 mm diameter) were prepared with diamond ultrasonic tips. The root-end cavities were filled with Pro-Root MTA® with ultrasonic vibration, sonic vibration or no vibration. The positive control group did not receive any material while the negative control group was totally rendered waterproof. After material set, the specimens were immersed in Rodhamine B for 24 h, under vacuum in the first 15 min, then washed, dried and split longitudinally for evaluating the infiltration at the dentin/material interface. Data were analyzed using ANOVA and Tukey's tests at 5% significance level. Sonic vibration promoted the lowest infiltration values (p<0.05). It was concluded that sonic vibration could be considered an efficient aid to improve the sealing ability of MTA when used as root-end filling material.
尽管三氧化矿物凝聚体（MTA）具有优异的性能，但其凝聚技术可能会对其封闭能力产生一定影响。本研究的目的是比较MTA的声波和超声凝固的封闭能力。34颗拔除的人牙进行根管预备，采用主动侧向加压技术用Sealapex封闭剂和牙胶尖充填。将牙齿处理成防水状态，并在根尖3mm处进行根尖切除术。用金刚石超声尖制备根端窝洞（深3.0mm，直径1.4mm）。根端窝洞分别用超声振动、声波振动或无振动的Pro-Root MTA®充填。阳性对照组不接受任何材料，阴性对照组完全处理成防水状态。材料凝固后，将标本浸入罗丹明B中24小时，前15分钟在真空条件下进行，然后冲洗、干燥并纵向劈开，以评估牙本质/材料界面的渗透情况。使用方差分析和Tukey检验在5%显著性水平下分析数据。声波振动促进的渗透值最低（p<0.05）。得出的结论是，当用作根端充填材料时，声波振动可被视为提高MTA封闭能力的有效辅助手段。
