Comparison of some physical properties of acrylic denture base material cured by water bath and microwave techniques

Abstract

This study was designed to evaluate the physical properties (porosity and transverse strength) for microwave cured acrylic resin using new Iraqi microwavable flask. For transverse strength test, 20 acrylic samples were prepared with dimensions 65 × 10 + 0.03 × 2.5 mm. Ten samples were processed by conventional water bath technique, while the other 10 samples were prepared by microwave technique using new Iraqi microwavable flask. The transverse strength of the acrylic samples were measured by three–point bending test. For porosity test, 16 acrylic samples were prepared with dimensions 65 × 55 × 2.5 mm. Eight acrylic samples were processed by conventional water bath while the other 8 samples were processed by microwave technique using new Iraqi microwavable flask. Evaluation of porosity occurrence was done using microscope at 20× and 40× magnifications. The results of student’s t–test showed that there are no significant differences ( p > 0.05) in transverse strength for samples cured by water bath and microwave techniques while microscopical examination revealed that all acrylic samples which cured by both techniques were free from porosities. It was concluded that new Iraqi microwavable flask could be successfully used in curing of acrylic denture base material by microwave technique.