Evaluation of resin die materials

Dimensional accuracy of epoxy resins and their compatibility with impression materials

“…When Dentsply was cured in polyether and silicone (it was stated before by Cavazos that epoxy resin did not cure in silicone impression material) it had the same capacity of detail reproduction as the stone (Vel Mix) when used with any of the three impression materials (6.19~.). Vermilyea et al, (1979) custom trays were constructed. Using these custom trays, three types of impression materials (Table I) were used: polyether, addition silicone, and polysulfide.…”

Analysis of linear dimensional change of different materials used for casting dental models: plaster type 4, nanocomposites carbon nanostructures, polyurethane resin and epoxy resin

“…Plaster is the material of choice because of its low cost and ease-to-handle characteristics, 28 most plasters, however, show distortions 30 and some other limitations such as low fracture resistance and low abrasion resistance as well as low reproduction of details. 3,31 Stone has limited transverse strength, and this may predispose working casts to fracture when they are removed from impressions. 29 In order to produce designs with improved properties, such as accuracy and durability, studies have shown the possibility of using resin materials for casting dental models.…”

“…Such shrinkage has been observed in most studies that analyzed the dimensional behavior of resinous materials, due to the inherent polymerization shrinkage of polymers. 23,27,32,31,38 Citation: Junior One study 3 evaluated the dimensional accuracy of seven materials for making dies and reported that polyurethane resin underwent a combination of expansion and shrinkage, where resin-impregnated type IV plaster was the most accurate. Conversely, 37 dimensional stability has been demonstrated to be higher in silica reinforced polyurethane resin than in two synthetic type IV and type V plasters.…”

Dimensional Accuracy of an Epoxy Die Material Using Different Polymerization Methods

“…Vermilyea et al studied three epoxy resin die materials that showed a hardness and tensile strength superior to gypsum. In the early stages, the compressive strength of the resin was greater than that of the gypsum; at 24 hours, they seemed to be similar 15 . Nomura et al evaluated three epoxy resin materials for detail reproduction, hardness, and accuracy of fit with respect to a cast restoration.…”

“…In the early stages, the compressive strength of the resin was greater than that of the gypsum; at 24 hours, they seemed to be similar. 15 Nomura et al evaluated three epoxy resin materials for detail reproduction, hardness, and accuracy of fit with respect to a cast restoration. The resins demonstrated that, though their detail reproduction was comparable to die stone, the hardness of the materials tested was less than that of die stone, and with respect to a completed crown, the resin dies were undersized.…”