Ultrastructural evaluation of enamel after dental bleaching associated with fluoride
✍ Scribed by John A. Dominguez; Bruna Bittencourt; Milton Michel; Nilson Sabino; João Carlos Gomes; Osnara M. M. Gomes
- Publisher
- John Wiley and Sons
- Year
- 2012
- Tongue
- English
- Weight
- 965 KB
- Volume
- 75
- Category
- Article
- ISSN
- 1059-910X
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✦ Synopsis
Abstract
This study evaluated the effects on human enamel after two bleaching procedures: with a fluoridated bleaching agent and with topical fluoride application postbleaching. It used 43 enamel blocks (3 mm^2^) that were ground flat (600–2,000 grit) and polished with polishing paste (one and one‐fourth). Specimens were randomly divided into three groups according to the bleaching procedure: (1) control group, (2) hydrogen peroxide 35% (HPF) and topical application of fluoride 1.23%, and (3) HP 38% (OP) with fluoride in its composition. Bleaching agents were used according to the manufacturer's instructions. Three methodologies were used: nanoindentation, to observe surface hardness and elastic modulus; atomic force microscopy, to observe surface roughness (R~a~ − R~z~); and scanning electron microscopy, to observe the enamel surface effects. Group OP had a decrease in the elastic modulus after bleaching, which was recovered at 14 days. An increased roughness (R~a~; 32%) was observed on group HPF and had an increased erosion on enamel surface (67%). It was concluded that topical application of fluoride, after using the nonfluoridated whitening agent, increased the roughness values and erosion of enamel. Microsc. Res. Tech. 75:1093–1098, 2012. © 2012 Wiley Periodicals, Inc.