title: Fracture-load values of all-ceramic cantilevered FPDs with different framework designs.
abstract: The purpose of this study was to evaluate the fracture-load values of cantilevered all-ceramic fixed partial dentures (FPDs). Fifty FPDs were manufactured using a zirconia frame to replace a missing molar. The FPDs were divided into five groups, each with a different framework design. After thermocycling and mechanical loading, the load to fracture was measured. The Mann-Whitney Utest was used for statistical analysis. The mean fracture-load values for the test groups ranged from 346 to 548 N. Reinforcement of the shoulder on the oral side of the occlusal wall resulted in higher fracture load values, while increasing the wall thickness of the distal abutment did not improve fracture resistance. The results indicate that all-ceramic cantilever FPDs cannot yet be recommended for clinical replacement of a missing molar.
authors.affiliation: Department of Prosthodontics, University of Heidelberg, Im Neuenheimer Feld 400, 69120 Heidelberg, Germany. Brigitte_Ohlmann@med.uni-heidelberg.de
authors.forename: Brigitte
authors.initials: B
authors.lastname: Ohlmann
authors.forename: Katrin
authors.initials: K
authors.lastname: Marienburg
authors.forename: Olaf
authors.initials: O
authors.lastname: Gabbert
authors.forename: Alexander
authors.initials: A
authors.lastname: Hassel
authors.forename: Herbert
authors.initials: H
authors.lastname: Gilde
authors.forename: Peter
authors.initials: P
authors.lastname: Rammelsberg
mesh_terms: D003442:Crowns; D003776:Dental Porcelain; D019232:Dental Restoration Failure; D003799:Dental Stress Analysis; D003779:Denture Design; D003830:Denture, Partial, Fixed; D006801:Humans; D008963:Molar; D015040:Zirconium
chemical_list: D003776:Dental Porcelain; D015040:Zirconium; C028541:zirconium oxide