title: Three-dimensional finite element analysis of zirconia all-ceramic cantilevered fixed partial dentures with different framework designs.
abstract: The purpose of this study were: to perform stress analyses using three-dimensional finite element analysis methods; to analyze the mechanical stress of different framework designs; and to investigate framework designs that will provide for the long-term stability of both cantilevered fixed partial dentures (FPDs) and abutment teeth. An analysis model was prepared for three units of cantilevered FPDs that assume a missing mandibular first molar. Four types of framework design (Design 1, basic type; Design 2, framework width expanded buccolingually by 2 mm; Design 3, framework height expanded by 0.5 mm to the occlusal surface side from the end abutment to the connector area; and Design 4, a combination of Designs 2 and 3) were created. Two types of framework material (yttrium-oxide partially stabilized zirconia and a high precious noble metal gold alloy) and two types of abutment material (dentin and brass) were used. In the framework designs, Design 1 exhibited the highest maximum principal stress value for both zirconia and gold alloy. In the abutment tooth, Design 3 exhibited the highest maximum principal stress value for all abutment teeth. In the present study, Design 4 (the design with expanded framework height and framework width) could contribute to preventing the concentration of stress and protecting abutment teeth.
authors.affiliation: Division of Molecular and Regenerative Prosthodontics, Tohoku University Graduate School of Dentistry, Sendai, Japan.
authors.forename: Shoko
authors.initials: S
authors.lastname: Miura
authors.affiliation: Division of Molecular and Regenerative Prosthodontics, Tohoku University Graduate School of Dentistry, Sendai, Japan.
authors.forename: Shin
authors.initials: S
authors.lastname: Kasahara
authors.affiliation: Division of Molecular and Regenerative Prosthodontics, Tohoku University Graduate School of Dentistry, Sendai, Japan.
authors.forename: Shinobu
authors.initials: S
authors.lastname: Yamauchi
authors.affiliation: Division of Molecular and Regenerative Prosthodontics, Tohoku University Graduate School of Dentistry, Sendai, Japan.
authors.forename: Hiroshi
authors.initials: H
authors.lastname: Egusa
mesh_terms: D002516:Ceramics / Q000627:therapeutic use*; D003779:Denture Design; D003830:Denture, Partial, Fixed; D020342:Finite Element Analysis; D006801:Humans; D017060:Patient Satisfaction; D015040:Zirconium / Q000627:therapeutic use*
chemical_list: D015040:Zirconium; C028541:zirconium oxide
keywords: Y-TZP; fracture; gold alloy; modulus of elasticity; stress distribution