title: Stress analysis of an all-ceramic FDP loaded according to different occlusal concepts.
abstract: The aim of this study was to investigate the influence of four different occlusal concepts on stress distribution in a four-unit fixed dental prosthesis (FDP) made of zirconia. A three-dimensional finite element (FE) model was created and four model versions with between 15 and 42 contact points were developed. A force of 300 N was distributed over the chewing surface according to the different occlusal concepts and virtually applied perpendicularly to the occlusal plane in each version. Then, FE analysis was performed and stress distribution evaluated. Generally, highest tensile stresses were located at the point of load application within the veneering layer and ranged from 104 to 204 MPa. The highest tensile stresses within the framework were located at the basal side of the connectors and ranged between 12 and 39 MPa. This study shows that the distribution of occlusal contact points significantly influences the stresses induced by occlusal forces in four-unit all-ceramic fixed dental prostheses and strongly suggests that the number and distribution of occlusal contacts may be important to minimise fatigue effects caused by cycling.
authors.affiliation: Department of Orthodontics, Dentistry and Biomedical Materials Science, Hannover Medical School, Hannover, Germany. Dittmer.Marc@mh-hannover.de
authors.forename: M P
authors.initials: MP
authors.lastname: Dittmer
authors.forename: P
authors.initials: P
authors.lastname: Kohorst
authors.forename: L
authors.initials: L
authors.lastname: Borchers
authors.forename: R
authors.initials: R
authors.lastname: Schwestka-Polly
authors.forename: M
authors.initials: M
authors.lastname: Stiesch
mesh_terms: D001696:Biomechanical Phenomena; D001732:Bite Force; D003198:Computer Simulation; D000044:Dental Abutments; D003766:Dental Occlusion; D003776:Dental Porcelain / Q000737:chemistry*; D003801:Dental Veneers; D003804:Dentin / Q000502:physiology; D003779:Denture Design; D003830:Denture, Partial, Fixed; D055119:Elastic Modulus; D020342:Finite Element Analysis; D005899:Glass Ionomer Cements / Q000737:chemistry; D006801:Humans; D021621:Imaging, Three-Dimensional / Q000379:methods; D008422:Materials Testing; D008954:Models, Biological; D010513:Periodontal Ligament / Q000502:physiology; D013314:Stress, Mechanical; D014584:User-Computer Interface; D015040:Zirconium / Q000737:chemistry*
chemical_list: D005899:Glass Ionomer Cements; D003776:Dental Porcelain; D015040:Zirconium; C028541:zirconium oxide