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Effect of topical fluoride application on enamel after in-office bleaching, as evaluated using a novel hardness tester and a transverse microradiography method.
- Source :
- European Journal of Oral Sciences; Dec2017, Vol. 125 Issue 6, p471-478, 8p
- Publication Year :
- 2017
-
Abstract
- This study evaluated the effect of topical fluoride application on enamel hardness after in-office bleaching. Twelve human incisors were cut along the long axis, resulting in 24 halves used in four treatment groups ( n = 6 in each group): (i) untreated group (C); (ii) in-office bleaching material (B); (iii) treatment with surface reaction-type prereacted glass-ionomer varnish after in-office bleaching (B+ PRG); and (iv) treatment with acidulated phosphate fluoride solution after bleaching (B+F). All specimens were subjected to pH-cycling for 4 wk. Knoop hardness was measured using a Cariotester. The decalcification of enamel was assessed quantitatively by measuring the integrated mineral loss (Δ IML). Games-Howell analysis was used to assess statistical significance of between-group differences. The Knoop hardness decreased significantly after bleaching for all groups. In treatment groups B+ PRG and B+F, the Knoop hardness returned to the original unbleached values after the first pH cycle and did not change afterwards. In treatment groups C and B there was a gradual decrease in the Knoop hardness until the fourth pH cycle. The integrated mineral loss, Δ IML, was significantly higher in treatment group B+F after 2 wk than in the other treatment groups. After 4 wk, the Δ IML in treatment group B was significantly higher than in treatment group B+ PRG. The application of fluoride-containing materials after bleaching results in recuperation of hardness to levels similar to those of unbleached enamel. [ABSTRACT FROM AUTHOR]
- Subjects :
- DENTAL enamel
INCISORS
MICRORADIOGRAPHY
TOOTH whitening
FLUORIDE varnishes
Subjects
Details
- Language :
- English
- ISSN :
- 09098836
- Volume :
- 125
- Issue :
- 6
- Database :
- Complementary Index
- Journal :
- European Journal of Oral Sciences
- Publication Type :
- Academic Journal
- Accession number :
- 126201389
- Full Text :
- https://doi.org/10.1111/eos.12386