J Korean Acad Conserv Dent.  2009 Mar;34(2):95-102. 10.5395/JKACD.2009.34.2.095.

Effect of the bleaching light on whitening efficacy

• Park JH
• Shin HJ
• Park DY
• Park SH
• Kim JW
• Cho KM

• KMID: 2294350
• DOI: http://doi.org/10.5395/JKACD.2009.34.2.095

Abstract

The aim of this study was to evaluate the influence of light energy on the tooth whitening effect of bleaching agent in vitro. Extracted human mandibular molars were sectioned to 2 fragments(mesial, distal) and lingual portions of crown were used in this study. All specimens were stained using a red wine for 24 hours and immersed in artificial saliva. Specimens divided into four groups, group 1 and 2 light-activated by LumaCool (LED, LumaLite, Inc., Spring Valley, USA), group 3 and 4 light-activated by FlipoWhite2 (Plasma acr lamp, Lokki, Australia). Group 1 and 3 bleached with LumaWhite(LumaLite, Inc., Spring Valley, USA), group 2 and 4 bleached with Polaoffice(SDI, Victoria, Australia). Bleaching treatment performed during 10 minutes every 24 hours and repeated 6 times. During bleaching treatment , distal fragments was light-activated(L) but mesial fragments was not(NL). Shade assessment employed before and after bleaching treatment using spectrophotometer. The results of the change in shade was compared and analysed between NL and L by using paired-sample T test with 95% level of confidence. There were no significant differences between NL and L with a few exceptions. In group 2, a* value more change in L, in group 3, b* value more change in L, in group 4, a* value less change in L. After bleaching, L* value and DeltaE increased in all groups and the value of a* and b* decreased in all groups. Within the limitation of this test conditions, the results of this study indicate that the light energy has no obvious improving impact on the tooth whitening effect of a bleaching agent.

Keyword

Tooth whitening; Bleaching light; Hydrogen peroxide; Spectrophotometer

MeSH Terms

Crowns
Humans
Hydrogen Peroxide
Light
Molar
Saliva, Artificial
Tooth Bleaching
Victoria
Wine
Hydrogen Peroxide
Saliva, Artificial

Figure

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  Figure 1 Tooth fragment fabrication

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  Figure 2 Experiment flow

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  Figure 3 Differences of color value before and after tooth bleaching treatment (Mean shade changes in experimental groups.) ★: significance at the level of p<0.05

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