| Objective:Veneers were able to provide patients with a higher appearance satisfaction. It not only saves the majority of tooth tissue, but also provides a good gingival index. however, the lack of bond strength leaves a hidden danger to the use of the prosthesis. In this study, two kinds of veneer materials,which were IPS e.max pressed ceramic and CERAMAGE polymer ceramic, were bonded to extracted teeth with three bonding system, which were Panavia F bonding system, Variolink Veneer bonding system, RelyX Veneer bonding system, and then compared the shear strength and observed the bonding section through SEM. It ultimately provided a theoretical basis for the clinical choice of veneer bonding systems.Methods:Each of the IPS e.max pressed ceramic and CERAMAGE polymer ceramic was manufactured into the same size of48specimen, which was3X3X2mm3,after that the surface was polished with400#,600#,800#,1000#water sandpaper.3mm X3mm surface acted as a sandblasted surface.96caries-free premolars,which were freshly extracted for orthodontic reasons within one month, were selected and stored at4℃saline. It was0.6-0.7mm thickness of the labial surface of extracted teeth that was prepared by means of standard bur to expose an enamel area which was greater than3X3mm2. The enamel surface was polished with water sandpaper. The extracted teeth was embedded with resin, and the adhesive surface faced up. The prepared enamel was limited the bonding area by bonding a double-sided tape which had a3mm side of the rectangular hole. The bonding surface was not contaminated. IPS e.max pressed ceramic specimen were divided into3groups (A1,A2,A3) with16in each group in a random manner. The group of A1,A2,A3were respectively boned to extra teeth with Panavia F bonding system, Variolink Veneer bonding system, RelyX Veneer bonding system in accordance with the instructions. CERAMAGE polymer ceramic specimen were divided into3groups (B1,B2,B3) with16in each group in a random manner. The group of B1,B2,B3were respectively boned to extra teeth with Panavia F bonding system, Variolink Veneer bonding system, RelyX Veneer bonding system in accordance with the instructions. Each group were divided into2groups in a random manner: one group was stored at37℃water bath for24h,the other group was placed in automatic hot and cold cycler of5000cycles. The bonded specimen was placed in a universal testing machine, whose rate of decline was0.5mm/min. The shear bond strength was calculated through the maximum load at failure divided by the bonding area. The date was analyzed by SPSS18.0statistics software. The SEM was used to observe the type of fracture,and the bond fracture mode was classified.Results:1.In groups of the IPS e.max pressed ceramic and the CERAMAGE polymer ceramic, the shear bond strength of Variolink Veneer bonding system was higher than that of Panavia F bonding system and RelyX Veneer bonding system, There were significant differences (P<0.05)2. If the IPS e.max pressed ceramic and the CERAMAGE polymer ceramic were used the same bonding system, The shear bond strength was no significant difference (P>0.05).3. After5000thermal cycles,the shear bond strength of Panavia F bonding system decreased without significant difference (P>0.05), and there were significant differences of other groups (P<0.05).Conclusions:1.For the IPS e.max pressed ceramic and the CERAMAGE polymer ceramic,the three kinds of bonding system could achieve good bonding effect and meet the clinical need, but the Variolink Veneer bonding system had the highest bond strength.2.The bond strength of3bonding system decreased after5000thermal cycles, but Panavia F bonding system showed a higher stability to achieve a Long-lasting bonding effect.3.CERAMAGE polymer ceramic can obtain the same bond strength of IPS e.max in three kinds of bonding system. |
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