Considerations for adhesion of impression materials to impression trays

Comparative study of Dimensional stability and accuracy of various elastomaric materials

“…Same accuracy was achieved with putty/wash, single mix and double mix techniques when addition silicones were used. The most replicative impression and resultant die were found with full adhesive application to perforated custom made trays 15 . De Araujo 16 assessed the effect of material bulk and undercuts on the accuracy of impression materials.…”

“…The monophase technique is accomplished in a single-step procedure, using materials with a medium viscosity to allow the material itself to record the finer details while avoiding the slumping of the material in the tray, it is economical, less time consuming and simple to perform. 5,20 The most replicative impression and resultant die were found in a single mix technique with full adhesive application to the custom trays 15 . The single step technique resulted in slightly larger dies, while the 2-step technique without relief produced significantly smaller dies, when compared to the original stainless steel die.…”

Effect of reactive adhesives on the tensile bond strength of polyvinyl siloxane impression materials to methyl methacrylate tray material

“…Another factor that can lead to inaccurate impressions is that the impression materials, especially polyvinyl siloxane impression materials, used in the impression trays often do not possess any chemical adhesion. Retention of the impression to the tray is an important determinant of the accuracy of the cast and the resulting definitive prosthesis 1,2) . On removal of the impression from the mouth, the impression may be distorted if the impression material pulls away from the tray.…”

Dimensional Accuracy of an Epoxy Die Material Using Different Polymerization Methods

“…Custom‐formed acrylic resin (SR‐Ivolen, Ivoclar) impression trays, non‐perforated, were produced by using the master die as a sample at least 24 hours before taking the impressions. The trays had a 3‐mm gap around the triangular master die to provide sufficient space for the impression material 27–33 . Three location marks (circular depressions 2 mm wide and 1 mm deep) were made on the base of the metal die and included in the impression trays to standardize tray positioning during impression making.…”