SciELO - Scientific Electronic Library Online

 
vol.14 issue2The influence of screw type, alloy and cylinder position on the marginal fit of implant frameworks before and after laser weldingEffect of fluoridated varnish and silver diamine fluoride solution on enamel demineralization: pH-cycling study author indexsubject indexarticles search
Home Pagealphabetic serial listing  

Services on Demand

Journal

Article

Indicators

Related links

Share


Journal of Applied Oral Science

Print version ISSN 1678-7757On-line version ISSN 1678-7765

Abstract

GIANNINI, Marcelo; SILVA, Alessandra Peres; CAVALLI, Vanessa  and  LEME, Adriana Franco Paes. Effect of carbamide peroxide-based bleaching agents containing fluoride or calcium on tensile strength of human enamel. J. Appl. Oral Sci. [online]. 2006, vol.14, n.2, pp.82-87. ISSN 1678-7757.  https://doi.org/10.1590/S1678-77572006000200004.

OBJECTIVE: The aim of this study was to evaluate the effects of carbamide peroxide-based bleaching agents (CPG) containing fluoride (CF) or calcium (CCa) on the ultimate tensile strength of enamel (UTS). METHOD: A "cube-like" resin composite structure was built-up on the occlusal surface of twenty-two sound third molars to facilitate specimen preparation for the micro-tensile test. The restored teeth were serially sectioned in buccal-lingual direction in slices with approximate 0.7 mm thickness. Each slice was trimmed with a fine diamond bur to reduce the buccal, internal slope enamel of the cusps to a dumb-bell shape with a cross-sectional area at the "neck" of less than 0.5 mm2. The samples were randomly divided into 12 groups (n=11). The control groups were not submitted to the bleaching regimen. Specimens were treated with 10% CPG gel or with 10% CPG formulations containing CF (0.2% and 0.5%) or CCa (0.05% and 0.2%). Bleached groups received the application of the 10% CPGs for 6 hours/day at 37º C, during 14 consecutive days and were stored in artificial saliva (AS) or 100% relative humidity (RH) among each application. After bleaching, specimens were tested with the microtensile method at 0.5 mm/min. Data were analyzed by two-way ANOVA and Tukey test (5%). RESULTS: No significant difference was observed between groups stored in AS or RH. Specimens treated with CF or CCa presented similar UTS as unbleached control groups. CONCLUSION: Either 10% CPG formulations containing CF or CCa can preserve the UTS after bleaching regimen.

Keywords : Hydrogen peroxide; Calcium; Sodium fluoride; Dental enamel; Tensile strength.

        · abstract in Portuguese     · text in English     · English ( pdf )

 

Creative Commons License All the contents of this journal, except where otherwise noted, is licensed under a Creative Commons Attribution License