Effect of time in hardness test on artificially demineralized human dental enamel
Braz. j. oral sci
;
7(24): 1507-1511, jan.-mar. 2008. ilus, tab, graf
Artigo
em Inglês
| LILACS, BBO
| ID: lil-510950
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. Students 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.
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Índice:
LILACS (Américas)
Assunto principal:
Desmineralização do Dente
/
Esmalte Dentário
/
Testes de Dureza
Limite:
Humanos
Idioma:
Inglês
Revista:
Braz. j. oral sci
Assunto da revista:
Odontologia
Ano de publicação:
2008
Tipo de documento:
Artigo
País de afiliação:
Brasil
Instituição/País de afiliação:
Federal University of Santa Catarina/BR
/
State University of Rio de Janeiro/BR
/
State University of São Paulo/BR
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