Corrosion in Haas expanders with and without use of an antimicrobial agent: an in situ study

Autor(es)

Bagatin, Cristhiane Ristum ^[1] ; Ito, Izabel Yoko ^[2] ; Damiao Andrucioli, Marcela Cristina ^[1] ; Nelson-Filho, Paulo ^[1] ; Lima Ferreira, Jose Tarcisio ^[1]

Afiliação do(s) autor(es)

^[1] Univ Sao Paulo, Ribeirao Preto Dent Sch, Dept Pediat Clin Prevent & Community Dent, BR-14049 Ribeirao Preto, SP - Brazil

^[2] Univ Sao Paulo, Sch Pharmaceut Sci Ribeirao Preto, Dept Clin Anal Toxicol & Bromatol, BR-14049 Ribeirao Preto, SP - Brazil

• Tipo de documento: Artigo Científico
• Fonte: Journal of Applied Oral Science; v. 19, n. 6, p. 662-667, NOV-DEC 2011.
• Citações Web of Science: 3

Resumo

OBJECTIVES: The purpose of this study was to evaluate in situ the occurrence of corrosion in the soldering point areas between the wire, silver brazing and band in Haas expanders. MATERIAL AND METHODS: Thirty-four 7-12-year-old patients who needed maxillary expansion with a Haas expander were randomly assigned to two groups of 17 individuals each, according to the oral hygiene protocol adopted during the orthodontic treatment: Group I (control), toothbrushing with a fluoride dentifrice and Group II (experimental), toothbrushing with the same dentifrice plus 0.12% chlorhexidine gluconate (Periogard®) mouthrinses twice a week. The appliances were removed after approximately 4 months. Fragments of the appliances containing a metallic band with a soldered wire were sectioned at random for examination by stereomicroscopy, scanning electron microscopy (SEM) and energy dispersive x-ray spectroscopy (EDS). Data were analyzed statistically by Fisher's test at 5% significance level. RESULTS: The analysis by optical microscopy revealed areas with color change suggestive of corrosion in the soldering point areas joining the band and the wire in all specimens of both groups, with no statistically significant difference between the groups (p=1). The peaks of chemical elements (Ni, Fe, Cr, O, C and P) revealed by EDS were also similar in both groups. CONCLUSION: Color changes and peaks of chemical elements suggestive of corrosion were observed in the soldering point areas between the wire, silver brazing and band in both control and experimental groups, which indicate that the 0.12% chlorhexidine gluconate mouthrinses did not influence the occurrence of corrosion in situ. (AU)

• Processo FAPESP: 06/52612-6 - Avaliação da contaminação bacteriana e da corrosão em aparelhos disjuntores de Haas
• Beneficiário: Paulo Nelson Filho
• Modalidade de apoio: Auxílio à Pesquisa - Regular