Abstract
The shear/peel and tensile/peel bond strengths of the original Transcend and the new Transcend series 2000 bracket were determined using two different light-cured composites, Prismafil (high filler) and Heliosit (low filler). Predominant sites of failure were recorded for each bracket with each cement in each mode of testing.
Transcend series 2000 produced higher bond strengths than Transcend in shear/peel, but were significantly weaker in tensile/peel testing. Heliosit generally produced higher bond strengths than Prismafil.
Enamel fractures were observed with Transcend in both modes of testing when bonded with Heliosit, but not with Transcend series 2000 when bonded with Heliosit.
The new Transcend series 2000 brackets should only be removed in tensile/peel mode as suggested by the manufacturers, due to their very high bond strengths in shear.
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