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Evaluation of superficial microhardness in dental enamel with different eruptive ages
Palti, Dafna Geller; Machado, Maria Aparecida de Andrade Moreira; Silva, Salete Moura Bonifacio da; Abdo, Ruy Cesar Camargo; Lima, José Eduardo de Oliveira.
  • Palti, Dafna Geller; University of São Paulo. School of Dentistry of Bauru. Department of Pediatric Dentistry, Orthodontics and Public Oral Health. Bauru. BR
  • Machado, Maria Aparecida de Andrade Moreira; University of São Paulo. School of Dentistry of Bauru. Department of Pediatric Dentistry, Orthodontics and Public Oral Health. Bauru. BR
  • Silva, Salete Moura Bonifacio da; University of São Paulo. School of Dentistry of Bauru. Department of Pediatric Dentistry, Orthodontics and Public Oral Health. Bauru. BR
  • Abdo, Ruy Cesar Camargo; University of São Paulo. School of Dentistry of Bauru. Department of Pediatric Dentistry, Orthodontics and Public Oral Health. Bauru. BR
  • Lima, José Eduardo de Oliveira; University of São Paulo. School of Dentistry of Bauru. Department of Pediatric Dentistry, Orthodontics and Public Oral Health. Bauru. BR
Braz. oral res ; 22(4): 311-315, 2008. tab
Artículo en Inglés | LILACS | ID: lil-502184
ABSTRACT
This study evaluated the superficial microhardness of enamel in teeth at different posteruptive ages (before eruption in the oral cavity, 2-3 years after eruption, 4-10 years after eruption and more than 10 years after eruption). The study sample was composed of 134 specimens of human enamel. One fragment of each tooth was obtained from the flattest central portion of the crown to produce specimens with 3 x 3 mm. The enamel blocks were minimally flattened out and polished in order to obtain a flat surface parallel to the base, which is fundamental for microhardness testing. Microhardness was measured with a microhardness tester and a Knoop diamond indenter, under a static load of 25 g applied for 5 seconds. Comparison between the superficial microhardness obtained for the different groups was performed by analysis of Student's t test. The results demonstrated that superficial microhardness values have a tendency to increase over the years, with statistically significant difference only between unerupted enamel and that with more than 10 years after eruption. According to the present conditions and methodology, it was concluded that there were differences between the superficial micro-hardness of specimens at different eruptive ages, revealing an increasing mineralization. However, this difference was significant only between unerupted specimens and those with more than 10 years after eruption.
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Texto completo: Disponible Índice: LILACS (Américas) Asunto principal: Erupción Dental / Diente no Erupcionado / Esmalte Dental Límite: Niño / Child, preschool / Humanos Idioma: Inglés Revista: Braz. oral res Asunto de la revista: Odontología Año: 2008 Tipo del documento: Artículo País de afiliación: Brasil Institución/País de afiliación: University of São Paulo/BR

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Texto completo: Disponible Índice: LILACS (Américas) Asunto principal: Erupción Dental / Diente no Erupcionado / Esmalte Dental Límite: Niño / Child, preschool / Humanos Idioma: Inglés Revista: Braz. oral res Asunto de la revista: Odontología Año: 2008 Tipo del documento: Artículo País de afiliación: Brasil Institución/País de afiliación: University of São Paulo/BR