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. 2018 Jun 29;4(4):113-118.
doi: 10.1002/cre2.113. eCollection 2018 Aug.

Effect of sodium fluoride pretreatment on the efficacy of an in-office bleaching agent: An in vitro study

Khin Yupar Kyaw  1 , Masayuki Otsuki  1 , Michelle Sunico Segarra  1   2 , Junji Tagami  1
Affiliations

Effect of sodium fluoride pretreatment on the efficacy of an in-office bleaching agent: An in vitro study

Khin Yupar Kyaw et al. Clin Exp Dent Res. .

Abstract

This in vitro study evaluated the effect of sodium fluoride (NaF) on the bleaching efficacy using an artificial discolored bovine tooth model. Twenty specimens were prepared from bovine teeth by staining with black tea extract and were divided into two groups (n = 10). In control group, specimens were immersed in distilled water for 30 min. In NaF group, specimens were applied with 0.2% NaF for 30 min. Then, the specimens in each group were bleached by an in-office bleaching material (Shofu Hi-Lite, Shofu, Kyoto, Japan). The CIE L*a*b* values were measured by a dental colorimeter before and after 10 consecutive bleaching treatments, and the color difference (ΔE) was calculated. Brightness and color difference (ΔE) increased in both groups per bleaching cycle. There were no statistical differences in ΔE values between both groups (p > 0.05). It was concluded that the application of NaF before bleaching did not interfere with the bleaching effect.

Keywords: sodium fluoride; tooth bleaching; tooth color.

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Figures

Figure 1
Figure 1
Schematic illustration of an experimental samples, T: cylindrical tube, E: enamel, D: dentin, W: dental wax, R: acrylic resin. Wax was removed after polymerization of acrylic resin for embedding
Figure 2
Figure 2
Typical color change at each bleaching step
Figure 3
Figure 3
Comparison of changes of the average L*a*b* values of each period. (a) control group and (b) sodium fluoride group
Figure 4
Figure 4
ΔE changes after bleaching between control group and NaF group. No significant difference was observed between the two groups to the figure legend. NaF: sodium fluoride
See this image and copyright information in PMC

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