Longevity of Use of the Fixed Prosthetic Constructions in Relation to the Used Alloy

Introduction: The process of mixing metals with non metals is called alloying, and the resulting mixture alloy. Alloys are composed of at least two elements, from which one must be metal. They are divided into alloys for fixed partial dentures-FPD (golden, golden-platinum, silver-palladium alloys, alloys for soldering and alloys for metal-ceramic dentures). Purpose: the main purpose is to investigate the longevity of fixed partial dentures-FPD in patients in relation to the basic properties of the used alloys for their fabrication. Material and methods: As material we observed 81 clinical case of patients in which was used FPD with implementation of different types of alloys. We selected 81 clinical cases with FPD for metal-ceramics. In 27 clinical case with FPD was used alloy with highest nickel percentage. In another 27 patients in the base of the alloy there was highest percentage of palladium, the third group was patients with FPD fabricated from alloy with highest cobalt percentage. All clinical cases from the third examined groups of patients were observed for ten year period. Results: The alloys for FPD were applicable without the need reparation in average period of 9.7 years. Only in a small part of the patients that weren’t covered with this investigation there was a need for reparation or replacement with new FPD. The longevity that we measured for FPD fabricated with palladium alloy was 11. 1 years, for chrome alloy was 8.2, and for nickel alloy was 9.5 years. Conclusion: We determined that FPD have long durability because of the components of their alloys which create bond between the metal and the ceramics and presence of retentive oxides suitable for baking of ceramic masses. Therefore we justify the application of alloys as choice materials in the dental prosthodontics. In the examined patients the highest longevity was measured in patients with palladium as a used alloy in the FPD.