Stokes A N, Hood J A
Dent Mater. 1989 Nov;5(6):369-70. doi: 10.1016/0109-5641(89)90101-2.
High 24-hour tensile and shear bond strengths have been reported for silane-primed resin/porcelain interfaces, but bonds often failed after prolonged water storage. This study was designed to determine the influences of both a silane primer and thermocycling on interfacial leakage between a light-cured BisGMA resin and dental porcelain. Porcelain discs measuring 10 mm in diameter and 1.5 mm in thickness were fired. Axial cylindrical cavities were prepared through the discs with a diamond bur. Four groups of eight discs each were restored in the following modes: groups 1 and 2 with light-cured bonding agent and light-cured microfilled resin, and groups 3 and 4 with a silane primer followed by the same bonding agent and resin. Specimens were water-stored for 24 hr, after which those in groups 2 and 4 were thermocycled 200 times between 4 degrees C and 60 degrees C. Specimens were then sealed to steel anodes and placed in 1% KCl, maintained at 21 degrees C, around a stainless steel cathode. Leakage currents were recorded daily for 30 days and after six months, by application of a 10 V potential difference between the cathode and each anode. Positive and negative controls gave massive and nil readings, respectively. The mean leakages were consistently greatest in group 2 (being significantly greater than for the other groups). Results suggest that silane priming minimizes leakage at the resin/porcelain interface after thermal cycling.
据报道，硅烷预处理的树脂/瓷界面具有较高的24小时拉伸和剪切粘结强度，但在长时间水储存后粘结往往会失效。本研究旨在确定硅烷底漆和热循环对光固化双酚A甲基丙烯酸缩水甘油酯（BisGMA）树脂与牙科陶瓷之间界面渗漏的影响。烧制直径10毫米、厚度1.5毫米的瓷盘。用金刚石钻在瓷盘上制备轴向圆柱形洞腔。四组，每组八个瓷盘，按以下方式修复：第1组和第2组用光固化粘结剂和光固化微填料树脂，第3组和第4组先用硅烷底漆，然后用相同的粘结剂和树脂。标本水储存24小时，之后第2组和第4组的标本在4℃和60℃之间进行200次热循环。然后将标本密封到钢阳极上，并置于21℃的1%氯化钾中，围绕不锈钢阴极放置。在30天内每天记录泄漏电流，并在6个月后，通过在阴极和每个阳极之间施加10伏的电位差来记录。阳性和阴性对照分别给出大量和零读数。第2组的平均渗漏始终最大（显著大于其他组）。结果表明，硅烷预处理可使热循环后树脂/瓷界面的渗漏最小化。
