title: Investigation of stiffness and microstructure of joints soldered with gas-oxygen torch and infrared methods.
abstract: The stiffness of soldered connectors fabricated with the gas-oxygen torch technique was compared with those fabricated with the infrared technique. Untreated solder materials were used as controls. Untreated solder materials of gold-palladium, palladium-silver, and chromium-cobalt alloys exhibited significantly higher stiffness than the soldered specimens fabricated with either method. There was no significant difference between the gas-oxygen torch and the infrared groups of the gold-palladium and palladium-silver alloys. Photomicrographs revealed that the soldered specimens displayed porosities. For the chromium-cobalt alloy, the infrared group demonstrated significantly higher stiffness than the gas-oxygen torch group. Photomicrographs also disclosed that the chromium-cobalt alloy soldered with the gas-oxygen torch technique had a significant heat-affected zone.
authors.affiliation: Northwestern University Dental School, Chicago, Ill.
authors.forename: A C
authors.initials: AC
authors.lastname: Cheng
authors.forename: J Y
authors.initials: JY
authors.lastname: Chai
authors.forename: J
authors.initials: J
authors.lastname: Gilbert
authors.forename: L M
authors.initials: LM
authors.lastname: Jameson
mesh_terms: D000704:Analysis of Variance; D002858:Chromium Alloys / Q000737:chemistry; D003035:Cobalt / Q000737:chemistry; D003722:Dental Alloys / Q000737:chemistry*; D017268:Dental Prosthesis Retention / Q000295:instrumentation*; D012994:Dental Soldering / Q000295:instrumentation / Q000379:methods*; D004548:Elasticity; D005740:Gases; D006047:Gold Alloys / Q000737:chemistry; D007259:Infrared Rays; D008422:Materials Testing; D010100:Oxygen; D010165:Palladium / Q000737:chemistry; D016062:Porosity; D012834:Silver / Q000737:chemistry; D013718:Tensile Strength
chemical_list: D002858:Chromium Alloys; D003722:Dental Alloys; D005740:Gases; D006047:Gold Alloys; D003035:Cobalt; D012834:Silver; D010165:Palladium; D010100:Oxygen