Abstract
Objective:To determine the effect of different retraction cord medicaments on surface detail reproduction of polyvinyl siloxane impression materials and compare this effect on any two brands of commercially available polyvinyl siloxane impression materials. Material and methods: Four stainless steel dies were made according to ADA specification no.19. Three dies were treated with aluminium chloride (5%), ferric sulphate (13.3%) and epinephrine (0.1%) while the fourth one was left untreated to serve as control. Two impression materials (Dentsply and 3M ESPE) were used. Results: All the three medicaments adversely affected the surface detail reproduction of both the brands of the polyvinyl siloxane impression materials. These effects were statistically significant as compared to untreated control. The impressions of 3M ESPE brand have shown better surface detail reproduction as compared to Dentsply impression material. Conclusion: Surface detail reproduction of the polyvinyl siloxane impression materials is adversely affected by the retraction cord medicaments. The presence of moisture or any traces of the medicaments should be removed from the tooth surface to provide a dry field for the correct reproduction of the surface detail of these materials. Key words:Polyvinyl Siloxane, retraction cord medicaments, surface detail reproduction.
Highlights
Accurate reproduction of prepared tooth or edentulous arch is of critical importance in the fabrication of fixed or removable restorations
The polymerization of hydrophilic polyvinyl siloxane impression material is inhibited by sulfur compounds which are contained in latex gloves, rubber dam sheets and some surface containing retraction cord medicaments such as aluminum sulfate and ferric sulfate [4,5,6]
As sulfur containing medicaments inhibit the polymerization of polyvinyl siloxane impression material; it results in rippled surface and affects the surface detail reproduction [8]
Summary
Accurate reproduction of prepared tooth or edentulous arch is of critical importance in the fabrication of fixed or removable restorations. The polymerization of hydrophilic polyvinyl siloxane impression material is inhibited by sulfur compounds which are contained in latex gloves, rubber dam sheets and some surface containing retraction cord medicaments such as aluminum sulfate and ferric sulfate [4,5,6]. If impression does not reproduce this critical area where tooth and future restoration meet, fabricating the restoration with marginal adaptation to finish line and proper contour is not possible. This results in the failure of the prosthesis [7]. As sulfur containing medicaments inhibit the polymerization of polyvinyl siloxane impression material; it results in rippled surface and affects the surface detail reproduction [8]. This study was planned to find out whether these medicaments affect the detailed reproduction of the impression material and to compare the effect on two commercially available polyvinyl siloxane impression materials
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