title: 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-OvationC) 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 (SBSs; mean values: 37.44-41.24 MPa) and ceramic specimen fractures. Rebonding with the conventional silane coupling agent resulted in significantly (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 sufficient 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.
authors.affiliation: Department of Orthodontics, Bernhard-Gottlieb University Dental Clinic, Medical University of Vienna, Austria. frank.falkensammer@meduniwien.ac.at
authors.forename: Frank
authors.initials: F
authors.lastname: Falkensammer
authors.forename: Erwin
authors.initials: E
authors.lastname: Jonke
authors.forename: Michael
authors.initials: M
authors.lastname: Bertl
authors.forename: Josef
authors.initials: J
authors.lastname: Freudenthaler
authors.forename: Hans Peter
authors.initials: HP
authors.lastname: Bantleon
mesh_terms: D002516:Ceramics / Q000737:chemistry*; D001840:Dental Bonding / Q000379:methods*; D003738:Dental Cements / Q000737:chemistry*; D003799:Dental Stress Analysis / Q000379:methods*; D006801:Humans; D016910:Orthodontic Brackets; D019233:Retreatment; D012821:Silanes / Q000737:chemistry*; D013718:Tensile Strength
chemical_list: D003738:Dental Cements; D012821:Silanes