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izvor podataka: crosbi

Slumping during sculpturing of composite materials (CROSBI ID 145688)

Prilog u časopisu | izvorni znanstveni rad | međunarodna recenzija

Chiang, Yu-Chiang ; Knežević, Alena ; Kunzelmann, Karl-Heinz Slumping during sculpturing of composite materials // Dental materials, 24 (2008), 12; 1594-1601

Podaci o odgovornosti

Chiang, Yu-Chiang ; Knežević, Alena ; Kunzelmann, Karl-Heinz

engleski

Slumping during sculpturing of composite materials

Objectives. The aim of this study was to develop a method for measuring the slumping resistance of resin composites and to evaluate the efficacy using rheological methodology. Methods. Two commercial hybrid composites (Z100 and Z250) and a nanofill composite (Z350) were used to make disc-shaped specimens of 2 mm thickness. Three kinds of aluminum molds with triangular, circular, and square shaped cutting surfaces were pressed onto the resin discs to make standardized imprints. The imprints were light-cured either immediately (non-slumped) or after waiting for 2 min at 25 °C (slumped). White stone replicas were made and then scanned for topography using a laser 3-D profilometer. Slumping resistance index (SRI) was defined as the ratio of the groove depth of the slumped specimen to that of the non-slumped specimen. The pre-cure viscoelasticity of each composite was evaluated by an oscillatory shear test and normal stress was measured by a squeeze test using a rheometer. Correlation analysis was performed to investigate the relationship between the viscoelastic properties and SRI. Results. SRI varied between the three materials (Z100 < Z250 < Z350) and the imprint shapes did not affect the slumping tendency. The SRI was strongly correlated with the loss shear modulus G&#8243; but not with the loss tangent. Also, slumping resistance was more closely related to the resistance to shear flow than to the normal stress. Significance Slumping tendency could be quantified using the imprint method and SRI. The index may be applicable to evaluate the clinical handling characteristics of composites.

composite materials; handling characteristics; slumping; sculpturing; rheologic property

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Podaci o izdanju

24 (12)

2008.

1594-1601

objavljeno

0109-5641

Povezanost rada

Dentalna medicina

Indeksiranost