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INFLUENCE OF CO2 LASER ASSOCIATED TO A FLUORIDE SOURCE IN THE CONTROL OF DENTAL EROSION IN PRIMARY TOOTH ENAMEL - AN IN VITRO ANALYSIS

Grant number: 08/01256-0
Support type:Scholarships in Brazil - Doctorate
Effective date (Start): June 01, 2008
Effective date (End): May 31, 2011
Field of knowledge:Health Sciences - Dentistry - Pediatric Dentistry
Principal researcher:Silmara Aparecida Milori Corona
Grantee:Cristiane Tomaz Rocha
Home Institution: Faculdade de Odontologia de Ribeirão Preto (FORP). Universidade de São Paulo (USP). Ribeirão Preto , SP, Brazil

Abstract

Facing the importance and prevalence of dental erosion in children, mainly due to gastroesophageal reflux and lack of studies in the literature on the effects of the CO2 laser in the control of erosion, the objective of this study will be to determine the influence of different outputs of the CO2 laser associated with a source of fluoride in vitro in the control of erosion in primary teeth enamel. Seventy-five primary teeth will be used for the procurement of 150 fragments of enamel (3x3 mm). These will be covered with nail enamel, and the lower portion will be set a thong. Below, will be individually embedded in polyester resin, with the surface of enamel side up. For training injury of erosion, the specimens will be submitted to a challenge acid initial cycles of 2 by 1 minute, made the same day, with hydrochloric acid solution (pH 1.2) that simulates the gastric juice. The specimens will be randomly divided into 2 groups according to the superficial treatment to be made: I. 2% acidulated phosphate fluoride gel (APF) and II. placebo gel (control). Then, the specimens from each group will be divided in 5 subgroups, according to the parameters used in the laser irradiation with CO2: A. 1 W, B. 2 W, C. 3 W, D. 4 W, E. Absence of irradiation (control). The CO2 laser irradiation will be held in a non-contact, defocused at a distance of 4 mm of enamel. After the completion of the treatments, will be simulated erosive new challenges in hydrochloric acid solution (pH 1.2) for 5 days, and made 2 cycles of 1 minute per day. Subsequently, the method of histochemical staining, the specimens will be individually immersed in solutions of copper sulphate to 10% and rubeanic acid. After staining, will be obtained three sections and an examination of the permeability will be held on optical microscope, using the software, scanning and image Axion Vision 3.1. Will be held in each cut, five evaluations of the penetration of copper ions in relation to the total thickness of the enamel, totaling fifteen readings per specimen. For statistical analysis, will be considered the average of these measurements.

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Scientific publications
(References retrieved automatically from Web of Science and SciELO through information on FAPESP grants and their corresponding numbers as mentioned in the publications by the authors)
ROCHA, CRISTIANE TOMAZ; TURSSI, CECILIA PEDROSO; RODRIGUES-JUNIOR, ANTONIO LUIZ; MILORI CORONA, SILMARA APARECIDA. Impact of CO2 laser and stannous fluoride on primary tooth erosion. Lasers in Medical Science, v. 31, n. 3, p. 567-571, APR 2016. Web of Science Citations: 1.

Please report errors in scientific publications list by writing to: cdi@fapesp.br.