30 round porcelain specimens were divided into 3 groups randomly: Group A was for Superbond C&B resin cement ( self-cure ), Group B was for RelyX Veneer resin cement ( light-cure ), and Group C was for variolink II resin cement ( dual-cure ). When the specimens were exposed to ultraviolet radiation, the L * ,a * ,b * values of three bonding agents had color change with time. The L * values decreased, while the a * , b * values increased. The variability differed according to different types of resin cement. The color of Superbond C&B resin( self-cure ) had the bigger change, beyond the clinical aesthetic demand. The color of the other two bonding agents was also changed as time goes on. However, the color change was not beyond the clinical aesthetic demand in short time.%将30个瓷试件随机平均分为A(Superbond C&B化学固化粘结剂)、B(RelyXTMVeneer光固化粘结剂)、C(VariolinkⅡ双重固化粘结剂) 3组.3组的L、a、b值均随着照射时间的延长而发生变化:L值变小,a、b值变大,变化的大小程度随粘结剂种类的不同而不同.其中化学固化粘接树脂的颜色变化较大,超出了临床可接受的范围.光固化粘接树脂和双重固化粘接树脂在经过紫外光照射后虽然都会发生一定的变色,但是颜色变化都在临床允许范围内,而不易被肉眼所觉察.
展开▼
