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J Dent. 2012 Aug;40(8):644-53. doi: 10.1016/j.jdent.2012.04.010. Epub 2012 Apr 21.

The effects of light on bleaching and tooth sensitivity during in-office vital bleaching: a systematic review and meta-analysis.

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1
State Key Laboratory of Oral Diseases, Sichuan University, Chengdu, China.

Abstract

OBJECTIVE:

To evaluate the influence of light on bleaching efficacy and tooth sensitivity during in-office vital bleaching.

DATA SOURCES:

We performed a literature search using Medline, EMBASE and Cochrane Central up to September 2011.

STUDY SELECTION:

All randomised controlled trials (RCTs) or quasi-RCTs comparing the light-activated bleaching system with non-activation bleaching system were included. Reports without clinical data concerning bleaching efficacy or tooth sensitivity were excluded.

RESULTS:

Eleven studies were included in the meta-analysis. A light-activated system produced better immediate bleaching effects than a non-light system when lower concentrations of hydrogen peroxide (15-20% HP) were used (mean difference [MD], -1.78; 95% confidence interval [CI]: [-2.30, -1.26]; P<0.00001). When high concentrations of HP (25-35%) were employed, there was no difference in the immediate bleaching effect (MD, -0.39; 95% CI: [-1.15, 0.37]; P=0.32) or short-term bleaching effect (MD, 0.25; 95% CI: [-0.47, 0.96]; P=0.50) between the light-activated system and the non-light system. However, the light-activated system produced a higher percentage of tooth sensitivity (odds ratio [OR], 3.53; 95% CI: [1.37, 9.10]; P=0.009) than the non-light system during in-office bleaching.

CONCLUSIONS:

Light increases the risk of tooth sensitivity during in-office bleaching, and light may not improve the bleaching effect when high concentrations of HP (25-35%) are employed. Therefore, dentists should use the light-activated system with great caution or avoid its use altogether. Further rigorous studies are, however, needed to explore the advantages of this light-activated system when lower concentrations of HP (15-20%) are used.

PMID:
22525016
DOI:
10.1016/j.jdent.2012.04.010
[Indexed for MEDLINE]
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