Bond Strength of Metallic Brackets After Dental Bleaching

Abstract

Objective: To test the hypothesis that there is no difference between the action of at-home and in-office vital bleaching on the shear bond strength of metallic brackets bonded with composite resin 24 hours after bleaching. Materials and Methods: Forty-five human upper premolars were randomly divided into three groups: (1) control, (2) 10% carbamide peroxide at-home bleached, and (3) 35% hydrogen peroxide in-office bleached. Twenty-four hours after bleaching the teeth were pumiced, bonded with metallic brackets, and stored in distilled water. One day after bonding the shear bond strength of the brackets was determined. Results: The mean shear bond strength of Group 1 (control) and Group 2 (carbamide peroxide bleached) were not statistically different. Group 3 (hydrogen peroxide bleached) had a significantly lower mean shear bond strength than Group 1 and Group 2. Conclusions: The hypothesis is rejected. Use of 10% carbamide peroxide bleaching does not significantly alter shear bond strength values. On the other hand, use of 35% hydrogen peroxide bleaching significantly reduces these values and diminishes the amount of resin remnant on the tooth surface after bracket debonding. (Angle Orthod. 2009;79:122-126.)

Influence of four systems for dental bleaching on the bond strength of orthodontic brackets

“…6,18 In this regard, the control group and group V showed higher SBS; the amount of residual adhesive was also larger than in the other groups. In agreement with the findings of a previous study, 30 less residual adhesive has been found after dental bleaching with peroxides. This may be explained by the idea that the effects of the chemical agents cause a bond failure on the enamel bonding interface.…”

“…The use of 30%, 20 35%, 19,24,30 and 38% 29 hydrogen peroxide bleaching systems 24 hours before bonding significantly reduced the SBS orthodontic brackets; nevertheless, if the procedure is performed 7 days before bonding, it does not significantly reduce the force required to debond the brackets. 28 Under the conditions of the present study, the use of 38% hydrogen peroxide did not significantly affect the SBS; however, the mean value of that group was 2.4 MPa lower than that of the control group.…”

“…The effects of peroxides on the SBS of orthodontic brackets have been widely evaluat- ed. 19,20,[22][23][24][25][26][27][28][29][30] However, to our knowledge, the effects of RBCM for dental bleaching have not been previously evaluated.…”

Influence of microhybrid resin and etching times on bleached enamel for the bonding of ceramic brackets

“…Although there is no consensus, 11 there is evidence of significant decreases in the mean bond strength of orthodontic brackets when bonding is performed immediately after bleaching, 6,8,12 and strong recommendations have been made to wait several days before undertaking any adhesive procedure. [13][14][15] Accordingly, the purpose of this study was to determine the effects of different etching times with a bleaching treatment of 35% hydrogen peroxide on the shear bond strength of polycrystalline ceramic brackets bonded with different resins for different etching times. The null hypothesis asserted that there is no significant difference in bond strength when using different resins and enamel treatments.…”

Efecto del peróxido de hidrógeno al 40% sobre la fuerza de adhesión de brackets metálicos

“…de los brackets se realizó entre 7 y 14 días después del aclaramiento dental, pero sí identifi caron que existió mucha variación en los datos en los primeros 7 días, por lo que sugieren posponer por lo menos 1 semana el proceso de adhesión cuando el aclaramiento dental sea necesario (21). Chandrashekar et al, encontraron valores de RFC mayores en el grupo control y los menores en el grupo donde los brackets fueron cementados inmediatamente después del proceso de aclaramiento dental (22), estos datos son similares a los encontrados en nuestro estudio y a los reportados por otros investigadores (23,24). Vahid et al, compararon distintas concentraciones y tipos de agentes aclaradores, incluido el peróxido de hidrógeno al 40% encontrando que todos los agentes redujeron la capacidad adhesiva al ser sometidos a la prueba de RFC pero no demostraron diferencias signifi cativas entre los grupos a excepción del grupo control donde los valores fueron más altos (25).…”