Department of Fixed Prosthodontics, Osaka University Graduate School of Dentistry, Japan.
Department of Fixed Prosthodontics, Osaka University Graduate School of Dentistry, Japan.
J Prosthodont Res. 2020 Jul;64(3):319-325. doi: 10.1016/j.jpor.2019.09.004.
The purpose of this study was to evaluate the effectiveness of both a resin primer containing methyl methacrylate (MMA) and a silanizing agent on bonding to indirect resin composite blocks, using two types of build-up hybrid resin composites.
SHOFU BLOCK HC (Shofu) specimens were blasted with alumina, after which one of two surface treatments was applied: CERA RESIN BOND (Shofu, the Silane group) or HC primer (Shofu, the MMA group). Resin composites made using either Solidex Hardura (SDH, Shofu) or Ceramage Duo (CMD, Shofu) were built up and micro-tensile bond strength (μTBS) values were measured after storage in water for either 24h or 6 months (n=24 per group). The fracture surfaces after μTBS measurements and the resin block/build-up resin interfaces were observed by scanning electron microscopy (SEM).
The bond strength of the Silane/SDH group significantly decreased after 6 months (p<0.001), whereas in the MMA group there was no significant loss after 24h or 6 months (p=0.99). In the CMD group, the bond strength after 6 months was significantly lowered in both the Silane group (p<0.001) and the MMA group (p<0.001), but the latter still showed greater adhesion. SEM images demonstrated that the matrix resin was partially destroyed at the fracture surfaces of the MMA group and fracture surface unevenness was observed.
A primer containing MMA produced stronger bonding to CAD/CAM resin even after long-term aging compared to a silane treatment.
本研究旨在评估含有甲基丙烯酸甲酯（MMA）的树脂底漆和硅烷处理剂对两种堆积混合树脂复合材料与间接树脂复合块的粘结效果。
用氧化铝对 SHOFU BLOCK HC（Shofu）样本进行喷砂处理，然后对其进行两种表面处理之一：CERA RESIN BOND（Shofu，硅烷组）或 HC 底漆（Shofu，MMA 组）。使用 Solidex Hardura（SDH，Shofu）或 Ceramage Duo（CMD，Shofu）制备树脂复合材料，并在水中储存 24h 或 6 个月后测量微拉伸粘结强度（μTBS）值（每组 n=24）。在测量 μTBS 后，用扫描电子显微镜（SEM）观察断裂面和树脂块/堆积树脂界面。
Silane/SDH 组的粘结强度在 6 个月后显著降低（p<0.001），而 MMA 组在 24h 或 6 个月后没有明显损失（p=0.99）。在 CMD 组中，Silane 组（p<0.001）和 MMA 组（p<0.001）在 6 个月后粘结强度均显著降低，但后者仍表现出更强的粘结力。SEM 图像表明 MMA 组的基质树脂在断裂面部分破坏，并且观察到断裂面不平整。
与硅烷处理相比，含有 MMA 的底漆即使在长期老化后，对 CAD/CAM 树脂的粘结力也更强。
