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Hardness and compressive strength of indirect composite resins: effects of immersion in distilled water.
Da Fonte Porto Carreiro, A; Dos Santos Cruz, C A; Vergani, C E.
Afiliação
  • Da Fonte Porto Carreiro A; Department of Dental Materials and Prosthodontics, São Paulo State University, Araraquara Dental School, Araraquara, S.P., Brazil. adrianadafonte@hotmail.com
J Oral Rehabil ; 31(11): 1085-9, 2004 Nov.
Article em En | MEDLINE | ID: mdl-15525387
The aim of this study was to evaluate the effect of ageing in distilled water on the hardness and compressive strength of a direct composite resin Z100, a feldspatic porcelain (Noritake) and three indirect composites (Artglass, Solidex and Targis). For the Vickers hardness tests, five disk-shaped specimens (2 x 4 mm) of each material were prepared according to the manufacturers' instructions. The hardness tests were conducted using a Vickers diamond indentor. Compressive strength measurements were recorded on cylindrical specimens with a diameter of 6 mm and a length of 12 mm. The compression tests were carried out with a constant cross-head speed of 0.5 mm min(-1) on a mechanical test machine. For each material, 10 specimens were tested after 7 days of dry storage at 37 +/- 1 degrees C and 10 specimens were tested after water storage at 37 +/- 1 degrees C for 180 days. Noritake porcelain specimens showed higher hardness values than the composites. Among the composite materials, Z100 promoted the highest VHN values, regardless of the ageing periods. The results showed that Solidex and Z100 had the highest compressive strength values. Ageing in water reduced the hardness for all composites, but had no long-term effect on the compressive strength.
Assuntos
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Coleções: 01-internacional Base de dados: MEDLINE Assunto principal: Resinas Compostas Idioma: En Revista: J Oral Rehabil Ano de publicação: 2004 Tipo de documento: Article País de afiliação: Brasil País de publicação: Reino Unido
Buscar no Google
Coleções: 01-internacional Base de dados: MEDLINE Assunto principal: Resinas Compostas Idioma: En Revista: J Oral Rehabil Ano de publicação: 2004 Tipo de documento: Article País de afiliação: Brasil País de publicação: Reino Unido