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Objective To investigate the impact of the silane coupling agent silane coupling agent to repair different filler content composite resin restorations in composite resin filling body repair mechanism in technology , to provide a reference for clinical application . The method of production of 16 , 4 kinds of filler content (72 %, 74% , 78% , 80%) of the composite resin test pieces (N = 16, n = 4), the cold-heat cycle ( from 5 ° C to 55 ° C aging , × 5000, residence time : 30s) and subjected to surface treatment using diamond burs and 35% phosphoric acid etching agent after each filler content of the test pieces were used to self-etching adhesive (control group) , or a silane coupling of the two-step method agent joint two-step self-etching adhesive ( experimental group) bonding ( N = 4 , n = 2 ) , to Conte resin and then repair . Microtensile testing , and scanning electron microscopy of the fracture surface . Other aging specimen and aging 12 (N = 12, n = 3), respectively, using the three methods of surface treatment : 1 ) no treatment , 2) Emery bur produced using the same method , 3) carborundum bur silane coupling -linking agent , the surface morphology of the scanning electron microscope . Measurement data with the factorial variance analysis and t-test , one-way ANOVA or Kruskal-Wallis test , count data using the chi-square test . The results of the experimental group compared with the control group bonding strength is high , 74% and 78% both content group differences were statistically significant ( P <0.01 ) . Content of 80% of group bonding strength are the lowest in the experimental group and the control group (experimental group : 41.52 ± 8.37MPa ; control group : 39.65 ± 7.07 MPa ) . Conclusion silane coupling agent can be applied to composite resin filling body repair technique to improve the adhesive strength .
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