Abstract: Objective To investigate the effects of different adhesives and aging treatments on the bonding strength of two kinds of CAD / CAM all-ceramic materials. Methods The prepared Vita Enamic (experimental group) and Vitablocs Mark II (control group) specimens were randomly divided into groups (60 in each group), and three commonly used resin bonding materials (Panavia F, RelyX Veneer, and RelyX Unicem) were applied respectively. Body teeth (120 in total) were bonded, and they were randomly divided into a thermal-cold cycling group and a 37 ℃ water bath group for aging treatment. Finally, a universal material testing machine was used to test the bonding strength of each group, and statistical analysis was performed. Results 1) The bonding strength between the same kind of adhesive and the corresponding test specimen in the thermal-cold cycling group was lower than that in the 37 ℃ water bath group (P<0.05); 2) Under both conditions of 37 ℃ water bath and thermal-cold cycling, the bonding strength of each adhesive to Vitablocs MarkⅡ and Vita Enamic was Panavia F＞RelyX Veneer＞RelyX Unicem (P＜0.05); 3) The bonding strength of all three adhesives to Vitablocs MarkⅡ was higher than Vita Enamic (p <0.05). Conclusion The thermal-cold cycling aging treatment can reduce the adhesion of three kinds of adhesives to two kinds of porcelain materials. Panavia F can obtain higher bonding strength for CAD / CAM all-ceramic materials. Compared to Vita Enamic, Vitablocs MarkⅡ has higher bonding strength.

Key words: machinable ceramics, resin cement, bond strength