Prado Marina Carvalho, Carvalho Nancy Kudsi de, Vitti Rafael Pino, Ogliari Fabrício Aulo, Sassone Luciana Moura, Silva Emmanuel João Nogueira Leal
PROCLIN Department, School of Dentistry, UERJ - Universidade Estadual do Rio de Janeiro, Rio de Janeiro, RJ, Brazil.
Department of Prosthodontics, Dentistry School, UNITAU - Universidade de Taubaté, Taubaté, SP, Brazil.
Braz Dent J. 2018 Mar-Apr;29(2):195-201. doi: 10.1590/0103-6440201801833.
This study investigated the bond strength of two experimental root canal sealers based on MTA and butyl ethylene glycol disalicylate: MTAe and MTAe-HA. The reference materials used for comparison were AH Plus and MTA Fillapex. Twenty human upper incisors were selected and one 1 mm slice was obtained from the cervical third of each root. On the coronal surface of each slice, four 0.9 mm wide holes were drilled through the dentine. Standardized irrigation was performed and holes were filled with one of the four tested sealers: AH Plus, MTA Fillapex, MTAe, and MTAe-HA. The filled slices were stored in a PBS solution (pH 7.2) for 7 days at 37 °C. A push-out assessment was performed with a 0.7 mm plunger tip. Load was applied at a crosshead speed of 0.5 mm/min until sealer displacement. The results were expressed in MPa. The Kruskal-Wallis test was applied to assess the effect of each sealer on the push-out bond strength. Mann-Whitney with Bonferroni correction was used to isolate the differences. The alpha-type error was set at 0.05. Significant differences among medians values obtained by materials were observed (p<0.001). AH Plus displayed the highest value of bond strength (p<0.001). In contrast, MTA Fillapex presented the lowest bond strength among all tested sealers (p<0.001). Experimental sealers showed intermediary bond strength values, with no statistical differences between them (p>0.05). In conclusion, experimental root canal sealers presented suitable bond strength outcomes when compared to MTA Fillapex.
本研究调查了两种基于MTA和丁二醇二水杨酸酯的实验性根管封闭剂：MTAe和MTAe-HA的粘结强度。用于比较的参考材料为AH Plus和MTA Fillapex。选取20颗人上颌切牙，从每颗牙根的颈三分之一处获取1mm厚的切片。在每个切片的冠面，钻四个0.9mm宽的穿过牙本质的孔。进行标准化冲洗，并用四种测试封闭剂之一填充这些孔：AH Plus、MTA Fillapex、MTAe和MTAe-HA。将填充后的切片在37℃的PBS溶液（pH 7.2）中保存7天。使用0.7mm的柱塞尖端进行推出试验评估。以0.5mm/min的十字头速度施加负荷，直至封闭剂移位。结果以MPa表示。应用Kruskal-Wallis检验评估每种封闭剂对推出粘结强度的影响。使用经Bonferroni校正的Mann-Whitney检验来找出差异。α型错误设定为0.05。观察到材料获得的中位数之间存在显著差异（p<0.001）。AH Plus显示出最高的粘结强度值（p<0.001）。相比之下，MTA Fillapex在所有测试的封闭剂中呈现出最低的粘结强度（p<0.001）。实验性封闭剂显示出中间的粘结强度值，它们之间无统计学差异（p>0.05）。总之，与MTA Fillapex相比，实验性根管封闭剂呈现出合适的粘结强度结果。
