Abstract
Evaluation the Linear Dimensional Changes and Hardness of Gypsum Product / Stone Type IV after Adding Silica Nanoparticles
Highlights
Dental casting is an important step during the process of dental prostheses
Gypsum products are classified according to their particle size, as well as their properties depending on particle size [3]
The mixing of stone was carried out according to the manufacturing instructions:, water / powder ratio 21 mL / 100g at the same room temperature using a special mixer with vibration to decrease air bubbles, while for the comparative group, 2% silica nanoparticles (Sigma-Aldrich, Germany) with 60-70 μm in size were mixed in previous manner
Summary
Dental casting is an important step during the process of dental prostheses. The progress in both materials and techniques directly enhance impressions and working casts that are crucial for the success of clinical work [1].For decades, gypsum products have been used in dentistry to generate study and master casts, on which dental appliances are make-up [2]. The aim of this study was to evaluate and compare the linear dimensional changes and Vickers hardness of type IV dental stone materials with the same stone after adding silica nanoparticles. For the evaluation of linear dimensional changes, a stainless steel mold was prepared with a 30 mm diameter and a 3 mm height from its top part.
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