title: Finite element analysis of ceramic abutment-restoration combinations for osseointegrated implants.
abstract: All-ceramic restorations can solve many esthetic problems associated with implant-supported prostheses. This study evaluated stress concentration and distribution in implant abutments under normal masticatory forces using computer simulations. Two-dimensional finite element analysis was used to study four different abutment-restoration combinations using Brånemark implants. The models considered two positions of the fastening screw, two positions of the crown margins, cemented versus screw-retained prostheses, and clinical loads of 200 N. Models having screws on top of abutments had the lowest stresses (3.1 to 4.8 MPa) and best stress distribution. Screw-retained prostheses and short crown margins increased overall stresses (9.9 to 11.4 MPa).
authors.affiliation: Department of Prosthodontics, School of Dentistry, University of North Carolina at Chapel Hill, USA.
authors.forename: G
authors.initials: G
authors.lastname: Papavasiliou
authors.forename: A P
authors.initials: AP
authors.lastname: Tripodakis
authors.forename: P
authors.initials: P
authors.lastname: Kamposiora
authors.forename: J R
authors.initials: JR
authors.lastname: Strub
authors.forename: S C
authors.initials: SC
authors.lastname: Bayne
mesh_terms: D000537:Aluminum Oxide; D000044:Dental Abutments; D003758:Dental Implantation, Endosseous; D019250:Dental Implants, Single-Tooth; D003776:Dental Porcelain; D017267:Dental Prosthesis Design; D017268:Dental Prosthesis Retention / Q000295:instrumentation; D003799:Dental Stress Analysis; D007180:Incisor; D008437:Maxilla; D009716:Numerical Analysis, Computer-Assisted
chemical_list: D003776:Dental Porcelain; C070870:In-Ceram; D000537:Aluminum Oxide