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Evaluation and comparison of the effect of repeated microwave irradiations on some mechanical and physical properties of heat cure acrylic resin and valplast (nylon) denture base materials | ||
| Journal of baghdad college of dentistry | ||
| Article 1, Volume 23, Issue 3, 2011, Pages 6-10 | ||
| Authors | ||
| Raghdaa KJ; Ali AM | ||
| Abstract | ||
| ABSTRACTBackground: Microwave irradiation has been considered for denture sterilization/disinfection instead of chemicalsolutions since it has no expiration date and does not induce resistance to the microorganisms. The aim of this studywas to evaluate the effects of repeated microwave disinfection on heat cure and valplast (nylon) denture basematerials in some mechanical and physical properties.Material and method: A total No. of 320 specimens (80 maxillary denture bases and 240 specimens) were preparedin this study, then divided into two main groups according to the type of material used (heat cure resin and valplastresin).Each main group was subdivided into four subdivisions according to the type of test used (Transverse strengthtest, Surface hardness test, Surface roughness test, and fitness test), for each test 40 samples were divided into fourgroups according to the number of cycles of microwave disinfection that were applied (control, 1 microwave cycle,3 microwave cycles, and 7 microwave cycles). The term cycle refer to 3min of microwave disinfection at 680 watt.Each specimen was disinfected(subjected to one cycle) one time per a day then transferred to container containdistilled water until another cycle applied in the next day.Result: The repeated microwave irradiation of heat cure and valplast specimens showed slight but no significantdecrease in transverse strength, shore D hardness, and surface roughness. The results of the fitness of denture basematerials to stone cast showed an improvement in the fitness of heat cure and valplast denture base materials afterthe first microwave cycle, and no further improvements in the fitness were taken place after repeated microwavedisinfection.Key Word: valplast (nylon), microwave irradiation, mechanical and physical properties. (J Bagh Coll Dentistry2011;23(3):6-10). | ||
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