title: Mechanical properties of metal connectors soldered by gas torch versus an infrared technique.
abstract: OBJECTIVE
  The ultimate tensile strength and percentage elongation of solder joints of three alloy systems were tested.
  
  
  METHODS
  Solder joints were formed using either an infrared soldering machine or gas-oxygen torch. Intact solder materials were used as controls.
  
  
  RESULTS
  There were no significant differences in percentage elongation among different treatment methods of the solders or among various solder materials. All intact solder materials possessed significantly higher ultimate tensile strength than the joints made with either method. For high-noble and noble alloy solders, there were no significant differences in ultimate tensile strength of joints made with either method. For base metal alloy solder, the ultimate tensile strength of joints made with the infrared technique was significantly higher than that made with the gas-oxygen torch technique.
  
  
  CONCLUSIONS
  The infrared technique can be used as an alternative to the gas-torch technique for soldering high-noble and noble alloys. It is superior to the gas-torch technique for soldering a cobalt-chromium alloy.
authors.affiliation: Advanced Education Prosthodontics, Northwestern University Dental School, Chicago, Il 60611.
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; D003722:Dental Alloys; D017268:Dental Prosthesis Retention / Q000295:instrumentation*; D012994:Dental Soldering / Q000295:instrumentation / Q000379:methods*; D006047:Gold Alloys; D007259:Infrared Rays; D008422:Materials Testing; D010165:Palladium; D012834:Silver; D013718:Tensile Strength; D014800:Vitallium
chemical_list: D002858:Chromium Alloys; D003722:Dental Alloys; D006047:Gold Alloys; D014800:Vitallium; D012834:Silver; D010165:Palladium