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Effect of time in hardness test on artificially demineralized human dental enamel
Marsillac, Mirian de Waele Souchois de; Delbem, Alberto Carlos Botazzo; Vieira, Ricardo de Sousa.
Afiliação
  • Marsillac, Mirian de Waele Souchois de; State University of Rio de Janeiro. Department of Community and Preventive Dentistry. BR
  • Delbem, Alberto Carlos Botazzo; State University of São Paulo. Dental School of Araçatuba. Department of Dentistry. Araçatuba. BR
  • Vieira, Ricardo de Sousa; Federal University of Santa Catarina. Dental School. Department of Pediatric Dentistry. BR
Braz. j. oral sci ; 7(24): 1507-1511, jan.-mar. 2008. ilus, tab, graf
Article em En | LILACS, BBO | ID: lil-510950
Biblioteca responsável: BR28.1
ABSTRACT
A cross-sectional microhardness (CSMH) test was carried out in human dental enamel exposed to a demineralizing solution in order to evaluate two different times of indentation in sound tissue and artificially induced caries. Twenty caries-free extracted human molars had one of their smooth surfaces sectioned and the enamel surface was isolated with nail polish except for an area of 6 mm2. These specimens were submitted to artificially induced enamel caries on a lactate buffer containing 0.1 ppm fluoride (F) during 28 days. All specimens were bisected to create groups A and B in which CSMH test was performed employing a Knoop indenter with a 25 g load for 5 or 10 s, respectively. Student’s paired t-test (p<0.05) was used to determine statistically significant differences between groups A and B in 7 depths. There were no significant differences between any of the analyzed depths. Since the present experiment showed no significant difference when comparing indentations made with a 25 g load during either 5 or 10 s in different depths, this method can be used with either one of the time intervals tested without compromising a CSMH test on artificially demineralized human enamel.
Assuntos
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Coleções: 01-internacional Base de dados: BBO / LILACS Assunto principal: Desmineralização do Dente / Esmalte Dentário / Testes de Dureza Limite: Humans Idioma: En Revista: Braz. j. oral sci Assunto da revista: ODONTOLOGIA Ano de publicação: 2008 Tipo de documento: Article País de afiliação: Brasil País de publicação: Brasil
Buscar no Google
Coleções: 01-internacional Base de dados: BBO / LILACS Assunto principal: Desmineralização do Dente / Esmalte Dentário / Testes de Dureza Limite: Humans Idioma: En Revista: Braz. j. oral sci Assunto da revista: ODONTOLOGIA Ano de publicação: 2008 Tipo de documento: Article País de afiliação: Brasil País de publicação: Brasil