Division of Removable Prosthodontics, Department of Oral Rehabilitation, Fukuoka Dental College, Fukuoka, Japan.
J Prosthodont. 2009 Dec;18(8):684-7. doi: 10.1111/j.1532-849X.2009.00496.x. Epub 2009 Aug 4.
The purpose of this study was to evaluate the effect of the surface preparation on the maximum fracture load value of a highly filled gingival shade composite resin bonded to a denture base resin.
Block specimens were prepared from a heat-processed denture base resin and divided into five groups. The flat surfaces of the specimens were abraded with 400-grit silicon carbide paper, then prepared in one of the following ways: (1) without preparation (group 1); (2) application of silane coupling agent (group 2); (3) application of dichloromethane (group 3); (4) application of dichloromethane following the silane coupling agent (group 4); or (5) tribochemical silica coating (group 5). A highly filled gingival shade composite resin was applied (area diameter= 5 mm) and polymerized with a light polymerizing unit. Specimens made entirely of heat-processed denture base resin were also fabricated as references (group 6). The halves of the specimens of groups 4, 5, and 6 were thermocycled up to 10,000 times in water between 5 degrees C and 55 degrees C with a 1-minute dwell time at each temperature. Shear testing was performed in a universal testing machine at a crosshead speed of 1 mm/min, and the maximum fracture load values were determined (n = 10).
The maximum fracture load values of the highly filled gingival shade composite resin bonded to the denture base resin for all preparation groups were significantly enhanced before thermocycling (p < 0.05). Group 5 exhibited the greatest fracture load value, followed by group 4, compared to the other groups (p < 0.05), however, the fracture load values significantly decreased for these groups after thermocycling (p < 0.05), whereas the fracture load value of group 6 did not decrease (p > 0.05).
Tribochemical silica coating and the application of dichloromethane after the silane coupling agent were effective surface preparations for the bonding of a highly filled gingival shade composite resin to a denture base resin, however, the bond durability of these treatments may be insufficient.
本研究旨在评估表面处理对高填充牙龈色复合树脂与义齿基托树脂结合后的最大断裂载荷值的影响。
从热加工义齿基托树脂中制备块状样本，并将其分为五组。将样本的平面用 400 号碳化硅砂纸进行打磨，然后用以下方法之一进行处理：（1）不处理（第 1 组）；（2）应用硅烷偶联剂（第 2 组）；（3）应用二氯甲烷（第 3 组）；（4）应用硅烷偶联剂后再应用二氯甲烷（第 4 组）；或（5）机械化学二氧化硅涂层（第 5 组）。应用高填充牙龈色复合树脂（面积直径=5mm）并用光聚合单元聚合。还制备了完全由热加工义齿基托树脂制成的样本作为参考（第 6 组）。将第 4、5 和 6 组样本的一半在水（5°C 至 55°C 之间，每个温度停留 1 分钟）中进行 10000 次热循环。在万能试验机上以 1mm/min 的十字头速度进行剪切测试，并确定最大断裂载荷值（n=10）。
在热循环之前，所有处理组的高填充牙龈色复合树脂与义齿基托树脂结合后的最大断裂载荷值均显著提高（p<0.05）。与其他组相比，第 5 组的断裂载荷值最大，其次是第 4 组（p<0.05），然而，这些组在热循环后，断裂载荷值显著降低（p<0.05），而第 6 组的断裂载荷值没有降低（p>0.05）。
机械化学二氧化硅涂层和硅烷偶联剂后应用二氯甲烷是高填充牙龈色复合树脂与义齿基托树脂结合的有效表面处理方法，然而，这些处理方法的结合耐久性可能不足。
