13th World Congress for Laser Dentistry

26-28, April 2012

Barcelona, Spain

Meeting Abstract

Sponsors: World Federation for Laser Dentistry

-  Poster 36

TITLE: Nanomorfologia study of enamel by scanning electron microscopy bleaching by hydrogen peroxide 20% using a green LED.

AUTHORS: Sampaio FJP, Oliveira SCPS, Monteiro JSC, Vannier-Santos MA, Zanin FAA, Pinheiro ALB.

Center of Biophotonics - School of Dentistry - Federal University of Bahia

SOURCE: Med Oral Patol Oral Cir Bucal. 2012 May 1;17(Supplement1):S184.

* doi:10.4317/medoral.17643684

http://dx.doi.org/10.4317/medoral.17643684

Abstract

Dental bleaching is a very requested procedure in clinical dental practice and widely related to dental esthetics. The literature is contradictory regarding the effects of bleaching agents on the morphology and desmineralization of enamel after bleaching. The aim of this study was to analyze in vitro by scanning electron microscopy (SEM) the effect of hydrogen peroxide at 20% at neutral pH, cured by the green LED, to evaluate the action of these substances on dental enamel. We selected 15 pre-molars, lingual surfaces were sectioned and previously marked with a central groove to take the experimental and control groups on the same specimen. The groups were divided as follows. The mesial hemi-faces were the experimental group and distal ones as controls. For morphological analysis were performed 75 electron micrographs SEM with an increase of 43X and 220X and its images were evaluated by tree observers. Was also performed quantitative analysis of the determination of the surface atomic composition of the samples through microanalysis with the aid of scanning electron microscope. The use of hydrogen peroxide at a concentration of 20% at photoactivated green LED showed no significant changes in mineral composition of the samples or the dental morphological structure of the same when compared to their controls, according to the study protocol.