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.
journal_name
Biomaterialsjournal_title
Biomaterialsauthors
McCabe JF,Rusby Sdoi
10.1016/j.biomaterials.2003.10.088keywords:
subject
Has Abstractpub_date
2004-08-01 00:00:00pages
4001-7issue
18eissn
0142-9612issn
1878-5905pii
S0142961203010433journal_volume
25pub_type
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