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Water absorption, dimensional change and radial pressure in resin matrix dental restorative materials

Paper ID Volume ID Publish Year Pages File Format Full-Text
12905 822 2004 7 PDF Available
Title
Water absorption, dimensional change and radial pressure in resin matrix dental restorative materials
Abstract

The purpose of this work was to study the relationship between water absorption, dimensional change (swelling) under cavity constraint and radial stress generation in resin matrix dental restorative materials. Water absorption was determined on disc specimens whilst swelling was determined on samples of materials restrained within cavities cut in cast polymethylmethacrylate and pressure generated was determined using a ‘push-out’ test. Four commercially available resin matrix materials were used. A giomer material gave significantly greater water absorption than two compomers and a fluoride releasing composite (p<0.05). The giomer material was the only material which produced a significant degree of swelling (p<0.05) when restrained within a cavity. The giomer product produced the greatest radial pressure (over 20 MPa in 1 month) following water storage, however a significant pressure generation was also observed for other materials despite their much lower water absorption values.The mechanism of water absorption and the amount of water absorbed determine the dimensional changes and radial pressure generated by resin matrix materials in a moist environment.

Keywords
Dental materials; Dental composites; Water absorption; Radial pressure; Hygroscopic expansion
First Page Preview
Water absorption, dimensional change and radial pressure in resin matrix dental restorative materials
Publisher
Database: Elsevier - ScienceDirect
Journal: Biomaterials - Volume 25, Issue 18, August 2004, Pages 4001–4007
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Bioengineering