Document Detail

Effect of light irradiation on tooth whitening: enamel microhardness and color change.
MedLine Citation:
PMID:  20002925     Owner:  NLM     Status:  MEDLINE    
The aim of this study was to evaluate the influence of light exposure associated with 35% hydrogen peroxide (Pola Office, SDI, Melbourne, Vic., Australia) or 15% hydrogen peroxide (BriteSmile, Discus, Culver City, CA, USA) on the microhardness and color changes of bovine enamel. Experimental groups were Britesmile + Light (BL) (15% hydrogen peroxide + plasm arc; 4 x 20 minutes), Britesmile + No Light (BN) (BL, no light), Pola office + Light (PL) (35% hydrogen peroxide + LED; 4 x 8 minutes), and Pola office + No light (PN) (PL, no light). Color changes (DeltaE) and the CIELAB (Commission Internationale de l' Eclairage, L* a* b* color system) parameters (L*, a*, and b*) were assessed with a spectrophotometer before (B), immediately (A), 1 day and 7 days after bleaching. The microhardness was measured before (B) and after (A), the obtained data were submitted to a two-way analysis of variance, and DeltaE were submitted to t-test for each period. Only Pola Office, in which the peroxide is associated with the light, improved DeltaE when evaluated immediately after bleaching (p < 0.001). Light exposure did not influence DeltaE after 1 day or 7 days for either bleaching system. The enamel microhardness was not altered after bleaching for BriteSmile. However, enamel microhardness was reduced after bleaching for Pola Office, 283 MPa (+/-21) and 265 MPa (+/-27), respectively. It was concluded that these two bleaching systems were efficient regardless of the light systems used. However, the 35% hydrogen peroxide altered the enamel microhardness. CLINICAL SIGNIFICANCE Enamel microhardness was affected by a 35% hydrogen peroxide in-office bleaching therapy. Moreover, the in-office bleaching outcome was not improved by using the light associated with systems tested in this study. (J Esthet Restor Dent 21:387-396, 2009).
Mauricio Neves Gomes; Carlos Francci; Igor Studart Medeiros; N?vea Regina De Godoy Froes Salgado; Heraldo Riehl; Jos? Milton Marasca; Ant?nio Muench
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Publication Detail:
Type:  Comparative Study; Journal Article    
Journal Detail:
Title:  Journal of esthetic and restorative dentistry : official publication of the American Academy of Esthetic Dentistry ... [et al.]     Volume:  21     ISSN:  1708-8240     ISO Abbreviation:  J Esthet Restor Dent     Publication Date:  2009  
Date Detail:
Created Date:  2009-12-16     Completed Date:  2010-03-24     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  101096515     Medline TA:  J Esthet Restor Dent     Country:  England    
Other Details:
Languages:  eng     Pagination:  387-94     Citation Subset:  D    
Department of Dental Materials, School of Dentistry, University of S?o Paulo, Av. Prof. Lineu Prestes, 2227,Cidade Universit?ria, 05508-900 S?o Paulo, Brazil.
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MeSH Terms
Dental Enamel / anatomy & histology,  radiation effects*
Hydrogen Peroxide / administration & dosage,  radiation effects
Oxidants / administration & dosage,  radiation effects
Phototherapy* / instrumentation,  methods
Radiation Dosage
Random Allocation
Time Factors
Tooth Bleaching / methods*
Water / chemistry
Reg. No./Substance:
0/Oxidants; 7722-84-1/Hydrogen Peroxide; 7732-18-5/Water
Comment In:
J Esthet Restor Dent. 2009;21(6):395-6   [PMID:  20002926 ]

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine

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