IMMEDIATE VERSUS ONE-MONTH WET STORAGE FATIGUE OF RESTORATIVE MATERIALS

Immediate finishing is a highly desirable property of restorative mate rials. In general, the resin composites, the polyacid-modified resin c omposites and resin-modified glass-ionomers are finished immediately a fter light-curing. For the conventional glass-ionomers a waiting perio d of 24 h is recommended. Therefore, the objective of this study was t o investigate whether immediate finishing and application of cyclic lo ading under water spray on resin-modified glass-ionomers, a convention al glass-ionomer, a polyacid-modified resin composite and a resin comp osite are reflected in their Young's modulus and fatigue resistance af ter 1-month wet storage compared with a control group that could matur e untroubled for I month. From this study, it could be concluded that there is a material-dependent response on immediate finishing. For the conventional glass-ionomer, the waiting period of 24 h is highly advi sable. The resin composite suffered more than the other test materials . A second statement is that one must be cautious by the extrapolation of findings obtained on quasi static tests (Young's modulus) towards dynamic properties (flexural fatigue limit). (C) 1998 Published by Els evier Science Ltd. All rights reserved.