Department of Conservative Dentistry, Dental Science Research Institute, School of Dentistry, Chonnam National University, Gwangju, Republic of Korea.
J Adv Prosthodont. 2013 Aug;5(3):278-86. doi: 10.4047/jap.2013.5.3.278. Epub 2013 Aug 31.
The aim of this study was to determine whether the push-out bond strengths between the radicular dentin and fiber reinforced-composite (FRC) posts with various resin cements decreased or not, according to the coronal, middle or apical level of the root.
FRC POSTS WERE CEMENTED WITH ONE OF FIVE RESIN CEMENT GROUPS (RELYX UNICEM: Uni, Contax with activator & LuxaCore-Dual: LuA, Contax & LuxaCore-Dual: Lu, Panavia F 2.0: PA, Super-Bond C&B: SB) into extracted human mandibular premolars. The roots were sliced into discs at the coronal, middle and apical levels. Push-out bond strength tests were performed with a universal testing machine at a crosshead speed of 0.5 mm/min, and the failure aspect was analyzed.
There were no significant differences (P>.05) in the bond strengths of the different resin cements at the coronal level, but there were significant differences in the bond strengths at the middle and apical levels (P<.05). Only the Uni and LuA cements did not show any significant decrease in their bond strengths at all the root levels (P>.05); all other groups had a significant decrease in bond strength at the middle or apical level (P<.05). The failure aspect was dominantly cohesive at the coronal level of all resin cements (P<.05), whereas it was dominantly adhesive at the apical level.
All resin cement groups showed decreases in bond strengths at the middle or apical level except LuA and Uni.
本研究旨在确定不同树脂水门汀黏结纤维增强复合材料（FRC）桩核于根管冠、中、根尖 3 个部位时，其与根管牙本质间的黏结强度是否降低。
将 FRC 桩核用 5 种树脂水门汀（RelyX Unicem：Uni、含活化剂 Contax 和 LuxaCore-Dual：LuA、Contax 和 LuxaCore-Dual：Lu、Panavia F 2.0：PA、Super-Bond C&B：SB）黏结于下颌前磨牙内。将牙根沿冠、中、根尖 3 个部位切成圆片，以 0.5mm/min 的十字头速度进行推出强度测试，并分析其破坏模式。
黏结强度在根管冠部各树脂水门汀间无显著差异（P>.05），但在中、根尖部有显著差异（P<.05）。仅 Uni 和 LuA 黏结强度在各根段均无显著降低（P>.05）；其他各组在中、根尖部黏结强度均显著降低（P<.05）。破坏模式主要为冠部各树脂水门汀的黏结性破坏（P<.05），而根尖部主要为黏结-牙本质破坏。
除 LuA 和 Uni 外，其余树脂水门汀黏结强度在中、根尖部均降低。
