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International journal of interdisciplinary dentistry

versión impresa ISSN 2452-5596versión On-line ISSN 2452-5588

Resumen

ROJAS, Victor et al. Comparative in vitro analysis of the adhesive resistance to the shear bond strength of metal brackets adhered to dental surfaces treated with different bleaching agents. Int. j interdiscip. dent. [online]. 2021, vol.14, n.1, pp.17-21. ISSN 2452-5596.  http://dx.doi.org/10.4067/S2452-55882021000100017.

Aim:

To evaluate and compare the effect of three bleaching agents on the shear bond strength of metallic brackets.

Method:

Brackets were cemented on 76 human premolars extracted for orthodontic reasons. 4 groups were evaluated: (0) Control, (1) enamel treated with Carbamide Peroxide 16%, (2) Hydrogen Peroxide 35% and (3) Hydrogen Peroxide 10% “Whitening strips”. All brackets were cemented using Transbond XT adhesive system (3M, Unitek, USA). All samples were thermocycled (5.000 cycles). Shear bond strength was evaluated with a Bisco machine and the amount of adhesive material at the base of the brackets and enamel surface was assessed using the adhesive remnant index (ARI). The statistical analysis included Shapiro-Wilk, Kruskal-Wallis and Mann-Whitney U tests.

Results:

The results of shear bond strength for groups 0, 1, 2, and 3 were 12.64, 11.06, 6.4 and 9.34 MPa respectively, with statistically significant differences between groups (p <0.05). ARI index was significantly different in some groups (p <0.05), indicating cohesive failure for control, adhesive failure for group 2 (p <0.05), adhesive and cohesive failure for groups 1 and 3.

Conclusions:

The 35% hydrogen peroxide office bleaching agent reduces adhesion values in the metal brackets thermocycled 24 hours after bleaching.

Palabras clave : Orthodontic bracket; Shear bond strength; Dental bleaching.

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