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Direct bonding of orthodontic attachment has removed some of the esthetic concerns many adults previously had when considering orthodontic therapy. With an increase in adult treatment comes the challenge of direct bonding to non-enamel surface, such as composite restoration. The big problem that faces orthodontist is debonding of the brackets specially in cases when it fixed on restoration like composite. Therefore a roughened surface will need in order to bond the adhesive composite material to the substrate composite restoration, this roughness will lead to distraction, weaken and loss of integrity of the composite restoration. This study was designed to evaluate the bonding strength of three different generations of adhesive bonding and which one is better to use for bonding the orthodontic bracket to composite restoration, without doing any roughness on composite restoration surface and compare between them which one have better bonding strength with composite restoration.
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