Comparing &Evaluating the Effect of Air-Powder Polishing System on the Hot Cure Acrylic Denture Base Material Cured by Different Methods


This study was designed to evaluate the effects of an air-powder polishing system onthe hot cure acrylic denture base material, which was cured in the water bath and microwavemethod, and comparing it with a conventional dental lathe polishing specimens.Thirty samples were made from the hot cure acrylic resin denture base after beingcured in water bath and microwave oven; all samples are condition and then polished. Thesamples were numbered and divided into two groups (according to the types of curingmethod), each group consists of 15 specimens and sub divided into three subgroups: airflowpolishing in (30 sec.), airflow polishing in (10 sec.) and conventional dental lathe polishing in(2 min.). The average surface roughnesses of the samples have been determined with usingthe profilometer (surface roughness tester) before and after polishing procedures.All samples were weighted by using the precision electronic balance before and afterpolishing procedures to obtain the results. The statistical analysis of the results beforepolishing procedures showed that there were no statistically significant difference in thesurface roughness and weight loss of the hot cure acrylic denture base material for both curingmethods, while after polishing treatment by conventional dental lathe polishing (2 min.) andair-powder polishing (10 sec. and 30 sec.), the statistical analysis of the results showed thatthere were a decrease in the surface roughness and weight loss of the hot cure acrylic resin inthe water bath method more than in the microwave method and the best result shown with 2minutes pumice. The weight loss of the acrylic in the (10 seconds) group polished surfaceswas best for the (30 seconds) group when using an air-powder polishing system. So, it ispreferred when using this polishing technique especially on the microwave cure method andthe air-powder, to be used effectively to polish the acrylic denture base materials using a shortperiod time