Evaluation of shear bond strength of orthodontic resin and resin modified glass ionomer cement on bonding of metal and ceramic brackets

Resumo

The aim of this study was to evaluate the shear bond
strength of orthodontic resin and resin-modified glass ionomer
cement on bonding of metal and ceramic brackets. Material and
methods: Forty bovine teeth were sectioned and embedded into
PVC with chemically-cured acrylic resin. The labial surfaces were
flattened and received prophylaxis with pumice and water. Then they
were divided into four groups, according to the bonding material
and the type of bracket. Group 1: metallic bracket + Transbond XT;
Group 2: metallic bracket + Vitremer; Group 3: ceramic bracket +
Transbond XT; Group 4: ceramic bracket + Vitremer. The bonding
was performed according to the manufacturers’ recommendations.
The shear bond strength test was conducted in a universal testing
machine (TIRAtest 2420) at a crosshead speed of 0.5 mm/min. Then,
the fractured surfaces were evaluated using a stereomicroscope
(x15 magnification) to check the adhesive remnant index. Data was
subjected to two-way ANOVA and Tukey’s test for pairwise comparisons (α = 0.05). Results: The results suggested a non-significant effect
of the interaction (p > 0.97), and only main factors were significant
(p = 0.0001). The bond strength of Transbond XT was statistically
higher than Vitremer. Ceramic brackets obtained the highest values
of resistance when compared with metal brackets. Conclusion: The
ceramic brackets bonded with Transbond XT orthodontic resin have
excellent bond strength results.