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Rebonding performance of different ceramic brackets conditioned with a new silane coupling agent
Frank Falkensammer1, Erwin Jonke, Michael Bertl
1Department of Orthodontics, Bernhard-Gottlieb University Dental Clinic, Medical University of Vienna, Austria. frank.falkensammer@meduniwien.ac.at
European Journal of Orthodontics
|September 20, 2011
Summary
A new silane coupling agent enhances ceramic bracket rebonding strength, but caution is advised. Rebonded brackets show sufficient adhesion, yet increased bonding risks ceramic surface damage, necessitating careful debonding.
Area of Science:
- Materials Science
- Biomaterials
- Dental Materials
Background:
- Ceramic brackets are esthetic alternatives in orthodontics.
- Rebonding ceramic brackets is desirable for cost-effectiveness and sustainability.
- Assessing the efficacy and safety of rebonding agents is crucial.
Purpose of the Study:
- To evaluate the rebonding effect of a novel silane coupling agent on ceramic brackets.
- To compare the new agent with a conventional silane coupling agent and regular bonding.
- To assess shear bond strength (SBS) and adhesive remnant index (ARI) at the bracket-composite-ceramic interface.
Main Methods:
- Three types of ceramic brackets were tested: Fascination 2, Clarity SL, and In-OvationC.
- Groups included: rebonding with new silane, rebonding with conventional silane, and regular bonding (control).
- Shear bond strength was measured using a universal testing machine; ARI scores evaluated the interface.
Main Results:
- The new silane coupling agent yielded high SBS (37.44-41.24 MPa) and caused ceramic fractures.
- Conventional silane resulted in lower, clinically adequate SBS (20.20-29.92 MPa) with minimal fractures.
- Regularly bonded brackets showed variable SBS (17.06-41.56 MPa) based on bracket design.
Conclusions:
- Rebonded ceramic brackets achieve sufficient bond strength to ceramic surfaces.
- Higher adhesion from the new silane agent increases the risk of ceramic surface damage.
- Cautious debonding methods are recommended for ceramic brackets rebonded with the new silane agent.
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