title: Elastomeric impression materials: effect of bulk on accuracy.
abstract: Impression trays were fabricated providing 2, 4, and 6 mm spaces to determine the stability and accuracy of nine elastomeric impression materials on a simulated full crown preparation steel die. The interface space of 2 mm produced the most accurate impressions for all of the materials tested. All impression materials except one fell within the revised American Dental Association Specifications. The clinical-type tests, using castings on dies poured from these materials, corroborated the acceptance of those materials and techniques exhibiting the least dimensional change.
mesh_terms: D003760:Dental Impression Materials; D004548:Elasticity; D004987:Ethers; D011108:Polymers; D012826:Silicone Elastomers; D013440:Sulfides; D013499:Surface Properties
chemical_list: D003760:Dental Impression Materials; D004987:Ethers; D011108:Polymers; D012826:Silicone Elastomers; D013440:Sulfides