The relationship between contact angles of die stone on elastomeric impression materials and voids in stone casts

Pre‐ and Post‐set Hydrophilicity of Elastomeric Impression Materials

“…These studies also suggested that there is a strong negative correlation between mean contact angles and the ability of the impression material to be poured with dental stone without air bubble entrapment. Other studies 18,19 also reported better wetting ability of the hydrophilic poly(vinyl siloxanes), when compared with that of the hydrophobic ones; however, the contact angle values of these materials were significantly higher than those of polyether. 18 In all published research, hydrophilicity of the impression materials before setting was tested by the number of voids in the impression.…”

“…Other studies 18,19 also reported better wetting ability of the hydrophilic poly(vinyl siloxanes), when compared with that of the hydrophobic ones; however, the contact angle values of these materials were significantly higher than those of polyether. 18 In all published research, hydrophilicity of the impression materials before setting was tested by the number of voids in the impression. In most of the studies the authors used dies, 13,15,16,19 flat dentin surfaces (with or without grooves), 4,20 or plastic teeth, 14 while the primary method of mixing was by hand spatulation after dispensing equal lengths of base and catalyst; however, mode of mixing seems to be an important factor, as it has been shown that automixing produces significantly fewer voids than hand mixing.…”

Effect of non-ionic surfactants on surface properties of hydrophilic polyvinyl siloxane impression materials

“…The increased wettability of these products has been attributed to the incorporation of surface-active substances to the formula, increasing the affinity of the liquid phase of the plaster mix for the impression surfaces [6,7]. The surface-activated silicone impression materials exhibit greater wettability than non-activated materials [8,9].…”

Radiofrequency Glow Discharge as a Mode of Disinfection for Elastomeric Impression Materials

“…The incompatibility of impression materials and the disinfectants may affect the accuracy, texture, dimensional stability, hardness, and other important aspects of the casts which are the deciding factors of an excellent prosthesis. 31 Moreover, the method used should not be messy and tedious as impressions are an integral part of our daily practice. Hence, it is essential to choose a method, i.e., ideal for the impression material to be disinfected.…”