Efficacy of tray adhesives for the adhesion of elastomer rubber impression materials to impression modeling plastics for border molding

Statement of problem. Tray adhesive, which is used for the adhesion of elastomer rubber impression materials to a custom resin tray, lowers the retention of the impression materials to the impression modeling plastics, as some ingredients of tray adhesive make the impression modeling plastic soft and tacky. Purpose. The efficacy of tray adhesive, which is used for the adhesion of elastomer rubber impression materials to a custom resin tray, on the adhesion between elastomer rubber impression material and impression modeling plastic was investigated. Material and methods. Four silicone rubber impression materials (two addition reaction types and two condensation reaction types), two polysulfide rubber impression materials, and one impression modeling plastic were used in this study. Tensile strength between elastomer rubber impression material and impression modeling plastic with or without the application of tray adhesive was evaluated. Results. Although tray adhesives for both addition reaction type and both condensation reaction type of silicone impression materials and one tray adhesive for polysulfide rubber impression material increased the tensile strength between the impression material and impression modeling plastic, one tray adhesive for polysulfide rubber impression material decreased the tensile strength when sufficient drying time was not applied. (J Prosthet Dent 1998;79:140-44.). CLINICAL IMPLICATIONS Inaccurate casts would result from lowered adhesive strength. The results of this study revealed that tray adhesive for addition reaction types and condensation reaction types of silicone rubber impression materials were effective regardless of the drying time. It also revealed that polysulfide rubber impression materials caused a contrary effect without sufficient drying time.