title: Some parameters for testing deformation of elastomeric impression materials.
abstract: Because of conflicting published data, the temperature rise in four elastomeric materials was measured with a thermistor during setting in the oral cavity and in metal and plastic moulds of varying shapes and volumes for 'elastic set' specimens. The clinical temperature rise was 2-3 degrees C higher in the molar region than anteriorly, except for the polysiloxane. The temperature range attained in the set materials varied from 29 degrees C to nearly 35 degrees C for clinical and in vitro specimens. The average time taken by a group of operators to remove this type of impression from the mouth was five seconds. In a custom tray with light and heavy viscosity materials, the syringe material layer was only 0-0.15 mm thick and, essentially, the heavy viscosity material provided the elastic components for the impression.
authors.affiliation: Department of Dentistry, University of Adelaide, South Australia.
authors.forename: P A
authors.initials: PA
authors.lastname: Blomberg
authors.forename: S
authors.initials: S
authors.lastname: Mahmood
authors.forename: R J
authors.initials: RJ
authors.lastname: Smales
authors.forename: O F
authors.initials: OF
authors.lastname: Makinson
mesh_terms: D003760:Dental Impression Materials / Q000737:chemistry*; D004548:Elasticity; D011108:Polymers / Q000737:chemistry; D011145:Polyvinyls / Q000737:chemistry; D012117:Resins, Synthetic / Q000737:chemistry; D012408:Rubber / Q000737:chemistry*; D012826:Silicone Elastomers / Q000737:chemistry; D012833:Siloxanes / Q000737:chemistry; D013314:Stress, Mechanical; D013440:Sulfides / Q000737:chemistry; D013499:Surface Properties; D013696:Temperature; D013718:Tensile Strength; D013997:Time Factors; D014783:Viscosity
chemical_list: D003760:Dental Impression Materials; C022821:Impregum; D011108:Polymers; D011145:Polyvinyls; D012117:Resins, Synthetic; D012826:Silicone Elastomers; D012833:Siloxanes; D013440:Sulfides; C034183:vinyl polysiloxane; D012408:Rubber; C032915:polysulfide