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05). When different surface preparation methods were evaluated together, no aging and 10,000 thermocycling groups displayed higher μTBS values (P 0.05). When all aging periods were evaluated together, the surface preparation with air abrasion provided higher μTBS (P 0.05). The interactions of various aging periods with different surface preparation methods revealed significant variations in repair μTBS (P 0.05). There were statistically significant differences on failure mode distributions among surface preparation methods (P 0.001). SEM