title: Influence of implant/abutment joint designs on abutment screw loosening in a dental implant system.
abstract: The objective of this study was to investigate the influence of implant/abutment joint designs on abutment screw loosening in a dental implant system, using nonlinear dynamic analysis of the finite element method (FEM). This finite element simulation study used two dental implant systems: the Ankylos implant system (Degusa Dental, Hanau, German) with a taper joint (taper joint-type model), and the Bränemark implant system (Nobel Biocare, Gothenburg, Sweden) with an external hex joint (external hex joint-type model). The nonlinear dynamic analysis was performed using three-dimensional finite element analysis. In comparing the movement of the taper type-joint model and external hex type-joint model, it was found that the external hex type-joint model had greater movement than the taper type-joint model. The external hex joint-type model showed rotation movement, whereas the movement of the taper joint-type model showed no rotation. It was concluded that the nonlinear dynamic analysis used in this study clearly demonstrated the differences in rotation of components in dental implant systems with taper or external hex joints.
authors.affiliation: Department of Crown Bridge Prosthodontics, Nihon University School of Dentistry at Matsudo, 2-870-1 Sakaecho Nishi, Matsudo, Chiba 271-8587 Japan.
authors.forename: Tsuyoshi
authors.initials: T
authors.lastname: Kitagawa
authors.forename: Yasuhiro
authors.initials: Y
authors.lastname: Tanimoto
authors.forename: Misako
authors.initials: M
authors.lastname: Odaki
authors.forename: Kimiya
authors.initials: K
authors.lastname: Nemoto
authors.forename: Masahiro
authors.initials: M
authors.lastname: Aida
mesh_terms: D001672:Biocompatible Materials / Q000138:chemical synthesis*; D001863:Bone Screws; D003198:Computer Simulation; D017076:Computer-Aided Design / Q000295:instrumentation; D000044:Dental Abutments; D015921:Dental Implants; D003765:Models, Dental; D017711:Nonlinear Dynamics
chemical_list: D001672:Biocompatible Materials; D015921:Dental Implants