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Effect of 10 percent carbamide peroxide bleaching on sound and artificial enamel carious lesions
Pinto, Cristiane Franco; Leme, Adriana Franco Paes; Cavalli, Vanessa; Giannini, Marcelo.
  • Pinto, Cristiane Franco; State University of Campinas. Dental School of Piracicaba. Departament of Restorative Dentistry. BR
  • Leme, Adriana Franco Paes; Butantan Institute. Center for Applied Toxinology. São Paulo. BR
  • Cavalli, Vanessa; University of Taubaté. Departament of Dentistry. BR
  • Giannini, Marcelo; State University of Campinas. Dental School of Piracicaba. Departament of Restorative Dentistry. BR
Braz. dent. j ; 20(1): 48-53, 2009. ilus, tab
Article in English | LILACS, SES-SP | ID: lil-513913
ABSTRACT
This study evaluated the effect of 10 percent carbamide peroxide (CP) bleaching on Knoop surface microhardness (KHN) and morphology of sound enamel and enamel with early artificial caries lesions (CL) after pH-cycling model (pHcm). Human dental enamel blocks were randomly divided into 6 groups (n=10) 1 - sound enamel bleached (S) with CP (Rembrandt/Den-Mat); 2 - S and submitted to pHcm; 3 - CL bleached with CP; 4 - CL stored in artificial saliva and submitted to pHcm; 5 - CL treated with placebo gel and submitted to pHcm; 6 - CL bleached with CP and submitted to pHcm. Enamel blocks with known initial KHN values were demineralized (groups 3 to 6) and submitted to 12 day pHcm (groups 2, 4, 5 and 6). After demineralization and treatments, KHN was determined and the specimens were examined using scanning electron microscopy (SEM). Data were analyzed statistically by ANOVA and Tukey's test at 5 percent significance level. The results showed that among CL groups (3 to 6) only the group 3 presented remineralization after treatments. S groups (1 and 2) showed higher KHN and presented less formation of porosities on enamel surface than CL groups after treatments. In conclusion, bleaching procedures on enamel with CL did not exacerbate the demineralization, but should be indicated with caution.
RESUMO
Este estudo analisou o efeito do peróxido de carbamida a 10 por cento (PC) na microdureza Knoop de superfície (KHN) e morfologia do esmalte hígido e com lesões iniciais de cárie artificial (EC), após modelo de ciclagem de pH (cpH). Blocos de esmalte dental humano foram divididos aleatoriamente em 6 grupos (n=10) 1- esmalte hígido clareado (EHC) com PC (Rembrandt/Den-Mat); 2- EHC e submetido a cpH; 3- EC clareado com PC; 4- EC armazenado em saliva artificial e submetido a cpH; 5- EC tratado com gel placebo e submetido a cpH; 6- EC clareado com PC e submetido a cpH. Blocos de esmalte com a KHN conhecida eram desmineralizados (grupos 3 a 6) e submetidos a cpH (grupos 2, 4, 5 e 6). KHN foi determinada após a desmineralização e os tratamentos. Os espécimes foram examinados através de Microscopia Eletrônica de Varredura (MEV). Os dados foram analisados através de ANOVA e teste de Tukey (p<0,05). Os resultados indicaram que entre os grupos com EC (3 a 6) somente o grupo 3 apresentou remineralização após os tratamentos. Os grupos EHC (1 e 2) mostraram maior KHN e menor formação porosidades quando comparados aos grupos EC após os tratamentos. Os procedimentos clareadores no esmalte com lesão de cárie não exacerbaram a desmineralização, entretanto precisam ser indicados com cautela.
Subject(s)

Full text: Available Index: LILACS (Americas) Main subject: Peroxides / Tooth Bleaching / Urea / Tooth Demineralization / Oxidants / Dental Caries / Dental Enamel Type of study: Controlled clinical trial / Evaluation studies Limits: Humans Language: English Journal: Braz. dent. j Year: 2009 Type: Article Institution/Affiliation country: Butantan Institute/BR / State University of Campinas/BR / University of Taubaté/BR

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Full text: Available Index: LILACS (Americas) Main subject: Peroxides / Tooth Bleaching / Urea / Tooth Demineralization / Oxidants / Dental Caries / Dental Enamel Type of study: Controlled clinical trial / Evaluation studies Limits: Humans Language: English Journal: Braz. dent. j Year: 2009 Type: Article Institution/Affiliation country: Butantan Institute/BR / State University of Campinas/BR / University of Taubaté/BR