Rebonding performance of different ceramic brackets conditioned with a new silane coupling agent

Abstract

The objective of this study was to investigate the rebonding effect of a new silane coupling agent on various ceramic brackets bonded to ceramic specimen. Different ceramic brackets (Fascination 2, Clarity SL, and In- O.vationC) were assigned to three groups: rebonding with new silane coupling agent, rebonding with conventional silane coupling agent , or regular bonding as control ( n = 16). Bracket adhesion was calculated with a shear test in a universal testing machine. The bracket - composite - ceramic interface was evaluated using the adhesive remnant index score. One-way analysis of variance was applied for inferential statistics. Rebonding with the new silane coupling agent resulted in high shear bond strengths (SBS s ; mean values: 37.44 - 41.24 MPa) and ceramic specimen fractures. Rebonding with the conventional silane coupling agent resulted in signifi cantly ( P.< 0.001) lower clinically adequate SBS (mean values: 20.20 - 29.92 MPa) with the least ceramic specimen fractures. Regularly bonded ceramic brackets resulted in clinically adequate to high SBS (mean values: 17.06 - 41.56 MPa) depending on their bracket base design. Rebonded ceramic brackets showed suffi cient SBS to ceramic specimen surfaces. However, increased bracket adhesion was associated with a risk of ceramic specimen surface damage. Therefore, ceramic brackets rebonded with the new silane coupling should be debonded cautiously using alternative debonding methods. © The Author 2011.