Abstract
The Effect of Mixing Technique and Methods on Some Physical Properties of Dental Stone
Highlights
The mixing or spatulation of many dental materials is a troublesome and unpredictable process, because of the introduction of porosities caused by the nature of the water/ powder or paste/paste interaction
MATERIALS AND METHODS This study is started by a simple questioner distributed randomly to [120] dentists working in College of Dentistry at University of Mosul, the questioner include the following questions: 1.When you mix dental stone do you measure the powder and water according to the manufacturer instructions ? a
Add water to powder. 3.Do you know a method for mixing dental stone other than rubber bowl and spatula ? a
Summary
The mixing or spatulation of many dental materials is a troublesome and unpredictable process, because of the introduction of porosities caused by the nature of the water/ powder or paste/paste interaction. Such problems may result from the mechanical action of the mixing device. The porosity, and the strength, is proportional to the W/P ratio .Since stone is always mixed at a lower water powder ratio than plaster it is less porous and much stronger and harder.[6]. Surface hardness is very essential factor in evaluating dental stone. it is generally felt that the harder the stone the better will be the wear resistance and destruction during the fabrication and finishing of the pattern or casting.[13]
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