Abstract
The effect of filler content on handling characteristics, mechanical properties and accuracy of addition curing silicones was investigated on 7 sets of experimental materials with filler contents between 0 and 61.5% by weight. The consistency increased linearly with the amount of filler; working and setting times were consistent irrespective of the filler content. Exponential relationships were found between filler loading on the one hand and Shore A hardness and stiffness on the other. The linear free curing contraction was approximately 0.05% for all materials tested while the coefficients of thermal contraction linearly decreased with increasing filler content. Cooling of impressions of a standardized metal preparation from 37°, to 23°C had a tremendous impact on accuracy. Adequate die accuracy was obtained only when impression and model were produced at the same temperature.
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