@Article{, title={Evaluation of the Effect of Microwave Irradiation and Die Hardener Application on Surface Hardness of Type IV Dental Stone}, author={Lateef E. A. Al-Jorani لطيف عيسى الجوراني and Suha Fadhil Dulaimi سهى فاضل دليمي}, journal={Tikrit Journal for Dental Sciences مجلة تكريت لعلوم طب الاسنان}, volume={4}, number={2}, pages={128-135}, year={2016}, abstract={Type IV dental stone play an important role during fabrication ofindirect dental restoration. It should be accurate in every respect,dimensionally stable over time, hard enough to with standfabrication process resistant to the inadvertent abrasions caused byfabrication. The aim of present study was to evaluate the effect ofmicrowave irradiation and die hardener application on surfacehardness of type IV dental stone. Two commercial brands of typeIV dental stone (Spofadental/ Czech, Zhermack/ Italy) wereevaluated. 30 samples were prepared from each brand and left todry for 24hr. After that divided into three groups, control group(10 samples without treatment), 10 samples subjected tomicrowave irradiation at 650 watt output power and 2450 MHZfor 10 mint. And 10 samples painted with die hardener. Surfacehardness measured with Shore C (Durometer, Digital hardnesstester). The die hardener application not affect surface hardness ofboth brands (P>0.05). However microwave irradiation increasesurface hardness of Spofadental Type IV dental stone. But reducesurface hardness of Zhermack Type IV dental stone. After 24hr. ofpouring Type IV dental stone (Spofadental / Czech, Zhermack /Italy) die hardener application not affect surface hardness.However surface hardness of Spofadental Type IV dental stonemay be improved with microwave irradiation. But Zhermack TypeIV dental stone showed reduction in surface hardness aftermicrowave irradiation.

} }