Grande Nicola M, Plotino Gianluca, Lavorgna Luca, Ioppolo Pietro, Bedini Rossella, Pameijer Cornelis H, Somma Francesco
Department of Endodontics, Catholic University of Sacred Heart, Rome, Italy.
J Endod. 2007 Jul;33(7):859-63. doi: 10.1016/j.joen.2007.02.018. Epub 2007 Apr 16.
The aims of this study were to compare Resilon (Resilon Research LLC, Madison, CT) in conjunction with either a bonding (Epiphany; Pentron Clinical Technologies, Wallingford, CT) or a nonbonding endodontic sealer (Pulp Canal Sealer; Kerr Corporation, Orange, CA) to EndoRez (Ultradent Products Inc, South Jordan, UT) and gutta-percha with regards to the physical properties and flexural stress in standardized dentin cylinders and the flexural stress of Resilon and gutta-percha. The external surface of 50 maxillary central incisors was reduced by means of mechanical milling to obtain dentin cylinders with an external diameter of 3 mm and minimum length of 12 mm. Root canals were prepared to obtain a standardized cylindrical preparation of 1.3 mm in diameter at the center of the root. The cylinders were randomly divided into five groups (n = 10): group 1: obturation with gutta-percha and Pulp Canal Sealer; group 2: obturation with Resilon, Epiphany primer, and Epiphany; group 3: obturation with Resilon and Pulp Canal Sealer; group 4: obturation with EndoRez methacrylate-based endodontic sealer; and group 5: dentin cylinders were not obturated. Ten gutta-percha (group 6) and Resilon (group 7) pellets for the Obtura gun were also tested. A three-point bending test was used to measure the maximum load values of specimens from groups 1 to 5 and the flexural strength and flexural modulus values for specimens from groups 6 and 7. Statistical analysis was performed to determine significance differences (p < 0.05). An analysis of variance test showed no significant difference among groups 1 to 5 (p = 0.697; F = 0.60). An independent sample t test showed statistically significant differences between groups 6 and 7 in flexural strength (p = 0.000) and flexural modulus (p = 0.000). Within the limits of this study, it may be concluded that the currently available endodontic-filling materials and their recommended adhesive procedures are not able to influence the mechanical properties of root canal dentin and that the flexural properties of Resilon and gutta-percha are too low to reinforce roots.
本研究的目的是比较Resilon（Resilon Research LLC，麦迪逊，康涅狄格州）与粘结剂（Epiphany；Pentron Clinical Technologies，沃灵福德，康涅狄格州）或非粘结性根管封闭剂（牙髓根管封闭剂；Kerr Corporation，奥兰治，加利福尼亚州）联合使用时，与EndoRez（Ultradent Products Inc，南乔丹，犹他州）以及牙胶在标准化牙本质圆柱体中的物理性能和弯曲应力，以及Resilon和牙胶的弯曲应力。通过机械研磨减少50颗上颌中切牙的外表面，以获得外径为3 mm、最小长度为12 mm的牙本质圆柱体。预备根管以在牙根中心获得直径为1.3 mm的标准化圆柱形预备。将圆柱体随机分为五组（n = 10）：第1组：用牙胶和牙髓根管封闭剂充填；第2组：用Resilon、Epiphany底漆和Epiphany充填；第3组：用Resilon和牙髓根管封闭剂充填；第4组：用EndoRez甲基丙烯酸酯基根管封闭剂充填；第5组：牙本质圆柱体未充填。还测试了用于Obtura枪的10个牙胶（第6组）和Resilon（第7组）颗粒。采用三点弯曲试验测量第1至5组标本的最大载荷值以及第6和7组标本的弯曲强度和弯曲模量值。进行统计分析以确定显著性差异（p < 0.05）。方差分析显示第1至5组之间无显著差异（p = 0.697；F = 0.60）。独立样本t检验显示第6和7组在弯曲强度（p = 0.000）和弯曲模量（p = 0.000）方面存在统计学显著差异。在本研究的范围内，可以得出结论，目前可用的根管充填材料及其推荐的粘结程序无法影响根管牙本质的机械性能，并且Resilon和牙胶的弯曲性能过低，无法增强牙根。
