Effect of the bleaching light on whitening efficacy

Jong-Hyun Park; Hye-Jin Shin; Deok-Young Park; Se-Hee Park; Jin-Woo Kim; Kyung-Mo Cho

doi:10.5395/JKACD.2009.34.2.095

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Park, Shin, Park, Park, Kim, and Cho: Effect of the bleaching light on whitening efficacy

Original Article

Journal of Korean Academy of Conservative Dentistry

Journal of Korean Academy of Conservative Dentistry 2009; 34(2): 95-102.

Published online: 31 March 2009

DOI: https://doi.org/10.5395/JKACD.2009.34.2.095

Effect of the bleaching light on whitening efficacy

Jong-Hyun Park¹, Hye-Jin Shin², Deok-Young Park³, Se-Hee Park¹, Jin-Woo Kim¹, Kyung-Mo Cho¹

¹Department of Conservative Dentistry, College of Dentistry, Kangnung National University, Korea.

²Department of Conservative Dentistry, College of Medicine, A-jou University, Korea.

³Department of Preventive Dentistry, College of Dentistry, Kangnung National University, Korea.

Corresponding author: Kyung-Mo Cho. Department of Conservative Dentistry, College of Dentistry, Kangnung National University, Jibyun-Dong, Kangnung City, Kangwon-Do, Korea, 210-702. Tel: 82-33-640-3155, Fax: 82-33-640-3103, drbozon@kangnung.ac.kr

Received 10 November 2008 Revised 13 January 2009 Accepted 15 January 2009

(open-access):

This is an Open Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/by-nc/3.0/) which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.

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 ΔE 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.

Keywords: Tooth whitening, Bleaching light, Hydrogen peroxide, Spectrophotometer

Figures and Tables

Figure 1

Tooth fragment fabrication

Figure 2

Experiment flow

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

Table 1

List of bleaching light units used in this study

Table 2

List of bleaching powder used in this study

Table 3

Experimental groups

Table 4

One way ANOVA of shade changes

No significant differences between groups by scheffe test.

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