SILVA, Beatriz Costa Bidigaray da; IRALA, Luis Eduardo Duarte; GRAZZIOTIN-SOARES, Renata    SALLES, Alexandre Azevedo. Verification of structural changes of glass when submitted to 17% EDTA. RSBO (Online) []. 2011, 8, 1, pp. 48-53. ISSN 1984-5685.

INTRODUCTION AND OBJECTIVE: This in vitro study verified, through SEM, the structural changes on glass surface when submitted to EDTA. MATERIAL AND METHODS: Samples of 4 glass coverslip remained partially (lower half of the sample) immersed in 17% EDTA pH 7.3 for different periods (7 days, 24 hours, 6 hours and 30 minutes). The samples were analyzed by SEM and photographed with x19, 50, 100, 200, 400, 1000, 2000, and 3000 magnification. RESULTS: It was found that the four glass samples submitted to EDTA showed blisters and cracks regardless of time. The control sample showed few defects differing from those in contact with EDTA. CONCLUSION: EDTA led to changes in the glass structure.

: edetic acid; Endodontics; chelating agents.