The aims of this study were to evaluate the effect of change in time, temperature (increase or decrease) and some additives(Nigella sativa and Thyme oil) on the degree of conversion, residual monomer release, transverse strength, indentation hardness, volumetric and color changes of the vertex heat cured acrylic resin.The results of the present study were analyzed statistically by (Descriptive statistics, ANOVA and Duncan's multiple range test). The results of this study showed that both changes in time and temperature showed significant changes in the degree of conversion, residual monomer,...

This study aims to: 1- Modify Iraqi natural waxes by adding some natural and chemical materials in order to produce new experimental modelling waxes that can be used in dentistry. 2- Evaluate the new waxes by measuring the physical properties according to ADA specification No. 24 and ISO 1561. 3- Evaluate the manipulation of the prepared experimental modelling waxes in constructing maxillary completely edentulous record base.The results showed that the addition of 20% Na-CMC, 20% gum Arabic, and 20% rosin to hard paraffin led to decrease the maximum melting point, flow, thermal...