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Original Article

Ex vivo study about the influence of fissure sealants on the adhesive power of a standard orthodontic composite resin

1999, Volumen 29, Número 2
Luis Alberto Bravo González, Martín Romero, Arturo Baca García, Begoña Bravo
Prof. Titular de Ortodoncia. Clínica Odontológica Universitaria. Facultad de Medicina.Universidad de Murcia. Murcia

Enamel decalcification (whitened areas) around orthodontic brackets during therapy is a well-recognized problem. If a fissure sealant could be used to isolate the enamel and yet withstand debonding of the bracket during therapy, this problem might be overcome. The objectives of this ex vivo study were to determine a) the effects of two different light-cured fissure sealants upon the shear bond strength of stainless steel orthodontic brackets bonded to teeth with an standard orthodontic bonding resin and b) the fracture sites of these debonded samples. Seventy eight noncarious human premolars were divided into three groups of 26 teeth each. In group A (control) the brackets were bonded to the buccal surfaces of the prepared teeth with a small amount of self-cured, hybrid, acrylic (Bis-GMA) resin only, with a particle-size between .1 and 10.0 μm. In groups B and C the brackets were similarly bonded, except that the teeth were first treated with two different fissure sealants (unfilled, opaque and lightcured). After storage at 37 °C for 24 hours in an incubator in distilled water, the brackets were subjected to a shear force in an universal testing machine, and the fracture strengths were recorded, together with the sites of fracture. This study has demonstrated that (1) a fissure sealant resin can be applied to seal the buccal surface of a tooth and have a bracket bonded to it, which exhibits shear bond strengths statistically not different from those observed after the standard method of direct bonding of brackets, and (2) the fracture sites after debonding are principally located at the resin/bracket interface, in the control group as well as in the two groups previously sealed.  (Rev Esp Ortod. 1999;29(2):107-114)

Key words:
Fissure sealant. Adhesion. Composite orthodontic resin.
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