title: The fatigue strength of the interface between Ag-Pd alloy and hydrothermal ceramic.
abstract: OBJECTIVE
  The purpose of this paper was to investigate the fatigue strength of a hydrothermal ceramic fused to Ag-Pd alloy. This study compared the values with those of other metal-ceramic systems previously reported by other authors.
  
  
  METHODS
  This investigation was performed on 48 specimens made of Ag-Pd alloy frames (45 x 12 x 4 mm) on which the hydrothermal ceramic was fused (25 x 12 x 2 gmm). The specimens were divided into two groups. The first group of specimens was dynamically loaded immediately after casting and fusing, while the other group of specimens was thermocycled (1000 times at 0 degree C and 55 degrees C) before dynamic loading. The dynamic loading tests were carried out by using a modified three-point load method in a universal testing machine.
  
  
  RESULTS
  The determined dynamic loading limit was up to 550 N for thermocycled, and up to 850 N for non-thermocycled specimens. These results are very respectable in comparison with other metal-ceramics. A statistically significant difference between maximal dynamic forces and number of loading cycles for thermocycled and non-thermocycled samples was determined.
  
  
  CONCLUSIONS
  From the data obtained in this study and current literature profiles, it is concluded that the tested metal-ceramic system is more durable than other metal-ceramic systems.
authors.affiliation: School of Dental Medicine, University of Zagreb, Croatia. poljak@rudjer.irb.hr
authors.forename: R
authors.initials: R
authors.lastname: Poljak-Guberina
authors.forename: A
authors.initials: A
authors.lastname: Catovic
authors.forename: V
authors.initials: V
authors.lastname: Jerolimov
authors.forename: M
authors.initials: M
authors.lastname: Franz
authors.forename: V
authors.initials: V
authors.lastname: Bergman
mesh_terms: D006358:Hot Temperature; D008422:Materials Testing; D016876:Metal Ceramic Alloys / Q000737:chemistry*; D010165:Palladium / Q000737:chemistry; D012834:Silver / Q000737:chemistry; D013314:Stress, Mechanical; D016474:Weight-Bearing
chemical_list: D016876:Metal Ceramic Alloys; D012834:Silver; D010165:Palladium