Hiraishi Noriko, Loushine Robert J, Vano Michele, Chieffi Nicoletta, Weller R Norman, Ferrari Marco, Pashley David H, Tay Franklin R
Pediatric Dentistry and Orthodontics, The University of Hong Kong, Pokfulam, China.
J Endod. 2006 May;32(5):429-33. doi: 10.1016/j.joen.2005.07.005. Epub 2006 Feb 17.
Removal of the oxygen inhibition layer from the surface of resin-coated gutta-percha cones during packaging has been hypothesized for their weak adhesion to a methacrylate-based root canal sealer, resulting in their frequent delamination from the sealer after root canal obturation. This study examined the feasibility of creating oxygen inhibition layers on resin-coated gutta-percha cones via the adjunctive application of a dual-cured dentin adhesive just before bonding. Composite cylinders were bonded with EndoREZ to flat, resin-coated gutta-percha disks and similar disks that were post-treated with Prime&Bond NT Dual Cure adhesive and stressed to failure using a modified microshear testing design. Although shear strengths for both groups were relatively low, a 5-fold increase in shear strength was observed after adhesive application, with complex interfacial failures instead of complete sealer delamination from the resin-coating. In-situ dentin adhesive application appears to have merits in enhancing the coupling of resin-coated gutta-percha to methacrylate sealers.
在包装过程中从树脂涂层牙胶尖表面去除氧抑制层，被认为是其与甲基丙烯酸酯类根管封闭剂附着力较弱的原因，这导致根管充填后牙胶尖与封闭剂频繁分层。本研究探讨了在粘结前通过辅助应用双固化牙本质粘结剂在树脂涂层牙胶尖上形成氧抑制层的可行性。将复合圆柱体用EndoREZ粘结到平坦的、树脂涂层牙胶盘以及用Prime&Bond NT双固化粘结剂进行后处理的类似牙胶盘上，并使用改良的微剪切测试设计对其施加应力直至破坏。虽然两组的剪切强度都相对较低，但在应用粘结剂后，剪切强度提高了5倍，出现了复杂的界面破坏，而不是封闭剂从树脂涂层完全分层。原位应用牙本质粘结剂似乎有利于增强树脂涂层牙胶与甲基丙烯酸酯类封闭剂的结合。
