Objective: To evaluate the effect of three different enamel roughening method on the bond strength of metal brackets bonded to enamel surfaces with light-cured composite resin, and also to determine less harmful the roughening method on the enamel by SEM and photographic methods.
Methods: Forty two metal brackets and newly extracted premolar teeth were divided into three groups (n=14 for each group). The specimens were randomly assigned to one of the following rough conditions of the teeth surfaces: Roughening with (Group 1) conventional 37% orthophosphoric acid, (Group 2) 18% HCL and pumice (microabrasion) and (Group 3) sandblasting with 50 µ alumina particles. The all surfaces were photographically examined and additional two teeth surfaces in each group were examined for SEM. Brackets were bonded to the enamel surface on the premolars with a light-polymerized resin composite. All specimens were stored in water for 1 week at 370C and then thermocycled. The shear bond strength values were measured on a universal testing machine. P values less than or equal to .05 were considered statistically significant.
Results: The specimens in Group 1 and 2 had significantly greater bond strength values. There were no statistically differences between the groups. However Group 3 showed relatively low values (7.79 ± 5.94 MPa) than the control group (P<.001). Enamel roughening method by 18% HCL and pumice gave clinically the finest enamel surface.
Conclusions: Microabrasion of the teeth with 18% HCL and pumice can be alternative tooth roughening method for bonding of brackets to enamel. After microabasion, occurred fine polished surfaces on the enamel give an easiness dental plaque control during orthodontic treatment.
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