Effect of sandblasting on the bond strength of the bondable molar tube bracket

This Study examined the effect of surface treatment with sandblasting on br acket bonding strength. Extracted human tooth, base metal alloy and porcela in surfaces were treated with sandblasting. The bracket bonding strengths o f sandblasted surfaces were evaluated and compared with the controls and et ched enamel surfaces. Morphological observation of the treatment surfaces a nd the failure sites was conducted. Statistical analysis included one-way a nalysis of variance (ANOVA) and a Scheffe's F-test at the 95% confidence le vel was performed. The results indicated that mean bond strength values ran ged from 3.6 MPa (the untreated control) to 20.4 MPa for the etched enamel surface. No statistically significant differences were determined among the etched enamel, sandblasted metal and sandblasted porcelain surfaces (P > 0 .05). Most debonding specimens failed at either the resin-tooth interface o r within the adhesive. In conclusion, sandblasting the metal and porcelain surfaces obtained a bracket bond strength comparable with that with the etc hed enamel surface.