Slumping resistance and viscoelasticity prior to setting of dental composites

Dental Materials : Official Publication of the Academy of Dental Materials
I B LeeJ L Ferracane

Abstract

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. Two commercial hybrid composites (Z100 and Z250) and a nanofill composite (Z350) were used to make disc-shaped specimens of 2mm 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 2min at 25 degrees 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. 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...Continue Reading

Citations

Aug 1, 2013·Dental Materials : Official Publication of the Academy of Dental Materials·Ljubomir M PetrovicTeodor M Atanackovic
Oct 7, 2010·Journal of Dental Research·N B CramerC N Bowman
Mar 19, 2014·Dental Materials : Official Publication of the Academy of Dental Materials·Khold Al-AhdalDavid C Watts
Nov 26, 2010·Dental Materials : Official Publication of the Academy of Dental Materials·Jack L Ferracane
Feb 23, 2010·Dental Materials : Official Publication of the Academy of Dental Materials·In-Bog LeeJack Ferracane
Feb 23, 2010·Dental Materials : Official Publication of the Academy of Dental Materials·Min-Ho KimIn-bog Lee
Jun 17, 2015·Dental Materials : Official Publication of the Academy of Dental Materials·Ljubomir M PetrovicTeodor M Atanackovic
May 1, 2016·Dental Materials : Official Publication of the Academy of Dental Materials·Johannes SteinhausBernhard Moeginger
Jul 2, 2016·Dental Materials : Official Publication of the Academy of Dental Materials·Muhammad Kaleem, David C Watts
Aug 3, 2010·Operative Dentistry·Dimitris KampouropoulosAfrodite Kakaboura
Jul 13, 2018·Dental Materials Journal·Guangyun LaiKarl-Heinz Kunzelmann
Jan 30, 2020·The Journal of Clinical Pediatric Dentistry·Hae-Jung KimKwang-Mahn Kim

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