title: Thermal stress failure of porcelain bonded to a palladium-silver alloy.
abstract: Cracking or rupturing, due to thermal stress, of porcelain bonded to a palladium-silver alloy indicated that porcelain-metal thermal compatibility was dependent on: the difference in thermal expansion coefficients of the porcelain and metal; the geometry and dimensions of the samples; and the porcelain-metal thickness ratio. A spherical configuration was more sensitive to thermal expansion coefficient differences than was a disc configuration. A higher incidence of cracking resulted from an increase in both specimen size and porcelain-metal thickness ratio.
mesh_terms: D055598:Chemical Phenomena; D002627:Chemistry, Physical; D003722:Dental Alloys; D001840:Dental Bonding; D003776:Dental Porcelain; D010165:Palladium; D012834:Silver; D013499:Surface Properties; D013816:Thermodynamics
chemical_list: D003722:Dental Alloys; D003776:Dental Porcelain; D012834:Silver; D010165:Palladium