Ohhashi M, Itoh K, Hisamitsu H, Wakumoto S
Department of Operative Dentistry, Showa University School of Dentistry, Tokyo, Japan.
J Dent. 1995 Dec;23(6):365-9. doi: 10.1016/0300-5712(95)00003-c.
The effects of the duration of cleaning and priming on the marginal adaptation of a light-activated resin composite in a cylindrical dentine cavity were examined by measuring the width of the wall-to-wall polymerization contraction gap.
The dentine cavity was cleaned with ethylene diamine tetra-acetic acid (EDTA) and primed 35 vol% hydroxyethyl methacrylate (HEMA) or glyceryl methacrylate (GM) solution for up to 60 s. The cavity was filled with a light-cured resin composite after the application of a dual-cured dentine bonding agent.
The formation of a contraction gap by the composite appeared to be prevented completely, regardless of the duration of priming with GM solution, when the cavity was cleaned with EDTA for 60 s. When cleaning was limited to just 30 s, GM priming had to be prolonged to 60 s to obtain complete marginal integrity. A significantly wide contraction gap was observed without EDTA cleaning, even when the cavity wall was primed with GM solution for 60 s.
GM solution was a better dentine primer than HEMA solution, since HEMA priming did not prevent gap formation under any of the conditions tested.
通过测量壁间聚合收缩间隙的宽度，研究清洁和预处理时间对圆柱形牙本质窝洞中光固化树脂复合材料边缘适应性的影响。
用乙二胺四乙酸（EDTA）清洁牙本质窝洞，并用35体积%的甲基丙烯酸羟乙酯（HEMA）或甲基丙烯酸甘油酯（GM）溶液预处理长达60秒。在应用双固化牙本质粘结剂后，用光固化树脂复合材料填充窝洞。
当用EDTA清洁窝洞60秒时，无论用GM溶液预处理的时间长短，复合材料似乎都能完全防止收缩间隙的形成。当清洁时间仅限制在30秒时，GM预处理必须延长至60秒才能获得完全的边缘完整性。即使窝洞壁用GM溶液预处理60秒，在没有EDTA清洁的情况下也观察到明显较宽的收缩间隙。
GM溶液是比HEMA溶液更好的牙本质预处理剂，因为在任何测试条件下，HEMA预处理都不能防止间隙形成。
