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KMID : 1035320140410030197
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Korean Society for Dental Materials
2014 Volume.41 No. 3 p.197 ~ p.207
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Effects of pre- and post-fluoride treatments on the shear bond strength of dental bracket
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Yang Yu-Kyoung
Seok Soo-Hwang
Lee Yoo-Mee
Yang Hyeong-Cheol
Lim Bum-Soon
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Abstract
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The purpose of this study was to evaluate the effects of the periodic topical fluoride application before (APF gel) and after (fluoride varnish) bracket bonding, on the shear bond strength of orthodontic brackets bonded to bovine teeth. Eighty permanent mandibular incisors of bovine with whole enamel and no decalcification, cracks, or fractures were used. After being extracted, the teeth were kept in a 0.1% tymol solution for disinfection for 1 week. Forty bovine teeth were untreated (CTL, EXP-1), and 40 teeth were pre-treated with 1.23% APF gel about 14 times during 28 days (EXP-2, EXP-3), and XRD analysis was performed to detect the formation of new crystal. After orthodontic bracket adhesion, each groups were divided into 2 subgroups. One subgroup was untreated (CTL, EXP-2) and stored in deionized water (37 ℃) for 28 days, and the other subgroup was treated with fluoride varnish for 4 times during 28 days (EXP-1, EXP-3). SBS test and ARI evaluation were performed, and the data were analyzed using Newman-Keuls multiple comparisons test (p=0.01). Calcium fluoride as well as fluorapatite crystals were formed on the bovine surface after periodical APF gel treatment. Pre-treatment with APF gel caused significant decrease of bond strength and different ARI scores compared to the control group. Post-treatment with fluoride varnish after bracket bonding resulted in significant decrease of bond strength also, however, the strength was higher than the clinically recommended values (6-8 MPa). Both pre-treatment and post-treatment with fluoride agents showed similar SBS and ARI score to the groups with only pre-treatment and no further worsening was observed. Therefore, the post-treatments of fluoride can be suggested after bracket bonding for reduced caries and white spot formations with maintaining proper bonding durability.
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KEYWORD
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APF gel, fluoride varnish, bovine, bracket, shear bond strength, adhesive remnant index
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