An in vitro study to assess different drying times of polyvinlysiloxane tray adhesive to achieve optimal tensile bond strength with autopolymerizing acrylic resin tray material

Background: The maximum tensile bond strength between acrylic special tray and silicone impressions is achieved when adhesive is allowed to dry for a longer period of time, usually 15 minutes. This delays the impression making procedure. Aims and Objectives: This study tested the tensile bond strength of tray adhesive on special trays using warm air to dry and hence decrease its drying time. Materials and Methods: 48 test specimens were prepared with autopolymerizing acrylic resin. The study groups considered in this study were - Group 1: 15 min (control) (normal drying), Group 2: 1 minute (with warm air drying), Group 3: 2 minutes (with warm air drying) and Group 4: 3 minutes (with warm air drying). Statistical Analysis: The one-way ANOVA was used to test the null hypothesis that there is no significant difference in mean tensile bond strength among the four study groups. Results and Conclusion: It was found that there was no change in tensile bond strength between adhesive and impression when air at 35 degree Celsius was blown from a distance of 10 cms for 2minutes: This study suggests a new technique to reduce drying time of tray adhesive considerably without compromising tray- impression bond strength.