Bonding brackets to ceramics using different ceramic surface treatments and adhesive resins
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Part 1. Determination of the effect of surface conditioning and cement effect on brackets bonded to ceramics Objective: The purpose of this study was to evaluate the effect of ceramic surface treatments on bond strength of metal brackets to machinable ceramics and veneering porcelain using different adhesive resins. Method: Machined ceramic specimens (10x10x2 mm thick) were prepared from Vitablocs mark II (Vita) and IPS e.max[R] CAD (Ivoclar). Layered porcelain fused to metal(IPS d.Sign[R] Ivoclar) was used to create the PFM specimens (n=60/Group). Half of the specimens were etched (9.6% HF, 15 sec) and the rest were non-etched. Three resin bonding systems were used for attaching metal brackets (Victory series[TM] APC II, 3M) to each group (=10): Transbond[TM] XT (3M), Light Bond[TM] (Reliance), or Blugloo[TM] (Ormco), all cured with LED curing unit (Bluephase G1600, Vivadent) for 50 sec each. Specimens were immersed in de-ionized water at 37 degrees C for 24 hour prior to shear bond testing (Instron) at a crosshead speed of 0.5 mm/min. Debond surface of ceramic and bracket base were examined for Failure mode (FM), Ceramic Damage Index (CDI) and Adhesive Remnant Index (ART). ANOVA and post-hoc multiple comparisons were used to analyze the differences in shear bond strength. Chi-Square was used to determine significance effect to FM, CDI, and ARI. Result: Significant differences in shear bond strength among groups were found (p[less than or equal to] 0.05) related to ceramic, surface treatment, and resin cement. Conclusion: Bond strength of metal bracket to ceramic is affected by type of ceramic, resin cement, and ceramic surface conditioning. Etching the ceramic surface enhanced ceramic-bracket bond strength. However, bond strengths in non-treated ceramic surface groups were still higher than bond strength required for bonding in orthodontic treatment. [TRUNCATED]
PLEASE NOTE: This work is protected by copyright. Downloading is restricted to the BU community: please click Download and log in with a valid BU account to access. If you are the author of this work and would like to make it publicly available, please contact email@example.com.Thesis (MSD) --Boston University, Goldman School of Dental Medicine, 2015 (Department of Orthodontics and Dentofacial Orthopedics).Includes bibliographic references: leaves 215-231.
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