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

Khin Yupar Kyaw,Michelle Sunico Segarra,Masayuki Otsuki,Junji Tagami

doi:10.1002/cre2.113

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.

Highlights

Tooth bleaching is one of the most conservative and cost‐effective dental treatments and is highly demanded by patients desiring to improve their smile
The active ingredient of in‐ office bleaching agents is a high concentration of hydrogen peroxide (ADA Council on Scientific Affairs, 2009)
As the teeth are dehydrated during the bleaching procedures, a negative osmotic pressure develops that draws the odontoblastic processes into the dentinal tubules, which was explained by Brännström's hypersensitivity theory (Papathanasiou, Kastali, Perry, & Kugel, 2002)

Summary

Introduction

Tooth bleaching is one of the most conservative and cost‐effective dental treatments and is highly demanded by patients desiring to improve their smile. There are several methods of tooth bleaching; professionally applied in the dental office (in‐office bleaching); dentist‐prescribed patient at‐home use (at‐home bleaching), over‐the‐ counter, and other nondental options. The in‐office bleaching is applied in a dental in‐office, and one or several visits are required to achieve satisfactory results. The active ingredient of in‐ office bleaching agents is a high concentration of hydrogen peroxide (ADA Council on Scientific Affairs, 2009). Hydrogen peroxide generates unstable free radicals that attack the organic chromogenic molecules in the tooth substrate and break down these pigments smaller transparent molecules (Sulieman, 2008). One of the most frequent adverse effects of tooth bleaching is postoperative dentin hypersensitivity (ADA Council on Scientific Affairs, 2009). Almost two‐thirds of patients who undergo tooth bleaching experienced transient tooth sensitivity during and after the procedure (Haywood, Leonard, Nelson, & Brunson, 1994)

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