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Objective: To investigate different approach to bond porcelain surface bonding metal brackets, polished porcelain surface roughness. : 1 porcelain specimen the preparation VeraBondV nickel-chromium alloy casting metal substrate thickness for mm, diameter 10 mm, pre-oxidation on the substrate surface, and then opaque porcelain, dentin porcelain, polished glazed (Shofu, Japan Vintage, A2), the total thickness of 3 mm. 2 porcelain surface treatment of porcelain specimens were randomly divided into five groups, and the following five methods for processing. Group 1: polished enamel surface rough diamond bur machinery, high pressure steam cleaning 5 min compressed air to spare. Group 2: the enamel surface with 10% hydrofluoric acid etching 1 min, water washing 1 min compressed air to spare. Group 3: the enamel surface polished diamond bur machinery, high pressure steam cleaning 5 min compressed air, then with 10% hydrofluoric acid etching 1 min, water gun flushing min, compressed air drying standby. Group 4: 50μmAl2O3 sand, 80 n/m2, 10 s, distance 10 mm, after blasting with anhydrous ethanol ultrasonic cleaning 3 min, water washing 1 min compressed air to spare. Group 5: 50μmAl203 sand, 80 N/m2, 10 s, distance 10 mm, with ethanol ultrasonic cleaning 3 min after blasting, water washing 1 min compressed air, and then 10% hydrofluoric acid etching 1min, water washing 1 min compressed air spare. Beijing and Tianjin enamel adhesive bond brackets and bonding after 30 min placed in artificial saliva for 24 hours, 500 thermal cycles from 5 to 55 ° C water bath. Shear force to remove the bracket, remove the obvious binder porcelain surface, smooth porcelain surface until the naked eye. Japan Shofu porcelain adjustment package, the low-speed mobile phone turn ceramic surface polishing: (1) white gravel 5,000 rpm is used to adjust; (2) Ceramist standard silicone rubber grinding head 10,000 rpm 3 minutes for pre-polishing; 3 Ultra I grinding head 10,000 rpm for 3 minutes for polishing; ④ Ultra II grinding head 10,000 rpm for 3 minutes for fine polishing surface roughness determination determination of surface roughness of the central area of ??the porcelain surface, each specimen to change direction three times, taking the mean statistical analysis SPSS16.0 software analysis . TALYSURF112 stylus type surface roughness measuring instrument (Taylor, UK), the sampling length of 0.8 mm, the evaluation length 3.2 mm, the running speed of 0.25 mm / s, measured centerline average roughness value Ra. Results: 1 roughening treatment method compared with SPSS16.0 statistical software, the experimental results were SNK-q test (a multiple of the mean pairwise comparisons). Each group in Group 3 and Group 1, Group 2, Group 4, Group 5 rough treatment difference was statistically significant (P lt; 0.05); Group 1, Group 2, 4 group, the the 5 rough treatment difference was not statistically significant (P gt; 0.05). Further comparison between Group 1, Group 2, Group 4, Group 5 roughening treatment, Group 4 and Group 1, Group 2, Group 5 rough treatment difference was statistically significant (P lt; 0.05); the Group 1, Group 2, Group 5 rough treatment difference was not statistically significant (P gt; 0.05) 2 before and after polishing among the groups roughness value SPSS16.0 statistical software SNK-q test the experimental results. Group 1, Group 2, the difference between the five groups was not statistically significant (P gt; 0.05); Group 3 and Group 4, respectively, and the difference of the other groups was statistically significant (P lt; 0.05 ). 3 polished roughness value of the control group compared with SPSS16.0 statistical software, the experimental results were the paired t-test (multiple of the mean pairwise comparisons). The difference among the three groups was not statistically significant (t gt; 0.05) Conclusion: in the the porcelain specimen porcelain surface roughening treatment, the combination of mechanical grinding and hydrofluoric acid etching on enamel surface roughening effect best, followed by mechanical polishing, hydrofluoric acid etching and sandblasting and hydrofluoric acid etching combination of three methods alone blasting method to do the worst porcelain surface roughening treatment effect. Porcelain porcelain specimen surface roughness value, the greater the change in its surface roughness after polishing. Polishing treatment methods on the rough surface effect is more obvious. 3 polished bracket can go after bonding, porcelain surface roughness of the enamel surface roughening treatment level.
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