Abstract
Objectives: Bonding to porcelain veneers, crowns or restorations is a major challenge for an orthodontist. A study was undertaken wherein, the shear bond strengths of metal and ceramic brackets on porcelain were compared and the effects of debonding on the debonded surfaces were evaluated. Materials and Methods: A total of 50 acrylic duplicate samples were fabricated from a therapeutically extracted maxillary first premolar, duly prepared for metal crown with porcelain facing. The samples were divided into two equal groups for bonding of metal and ceramic brackets. The shear bond strength of the samples was measured with a universal testing machine. Results: The metal brackets showed shear bond strengths with a mean of 12.21 ± 1.4 MPa, whereas the ceramic brackets displayed shear bond strengths with a mean of 17.45 ± 2.36 MPa. Visual and scanning electron microscope examination revealed multiple failure patterns with more of porcelain fractures in the ceramic brackets group. Conclusion: Bonding of metal and ceramic brackets to porcelain can be achieved with bond strengths comparable to that when bonded to enamel surface. Porcelain fractures are more commonly associated with debonding of ceramic brackets.
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