title: Evaluation of stress distributions occurring on zirconia and titanium implant-supported prostheses: A three-dimensional finite element analysis.
abstract: BACKGROUND
  Titanium implants have been successfully used to support fixed dental prostheses. Zirconia implants have been suggested as support for crowns, but information on their use to support partial fixed dental prostheses is limited.
  
  
  OBJECTIVE
  The purpose of this finite element study was to evaluate the maximum principal, minimum principal, and von Mises stresses and their distributions on zirconia and titanium implant-supported, partial fixed dental prostheses located in the anterior maxillary region.
  
  
  METHODS
  Zirconia and titanium implants (4 mm in diameter and 11. 5 mm in length) and prostheses made from 2 different materials (lithium disilicate and zirconia) were simulated, and 4 models were generated: Titan-IPS, Titan-Lava, Zircon-IPS, and Zircon-Lava. The maxillary bone was modeled as type 3 bone. The load was applied obliquely (534 N) and horizontally (76.5 N), and the stress values and distributions were examined.
  
  
  RESULTS
  Under horizontal loading, stresses generated on the cortical bone in the Zircon models were lower than those in the Titan models. Under oblique loading, stress values were similar in the same implant material and stress type. For all types of stress among the models, the stress values that occurred on the trabecular bone were found to be similar under both horizontal and oblique loading. The maximum stress values on the bones, implants, cores, and veneers did not exceed the strength of the structures.
  
  
  CONCLUSIONS
  Different stress values resulted from the different implant types. The prosthetic materials did not change the stress distributions in bone.
authors.affiliation: Lecturer, Gazi University, Faculty of Dentistry, Department of Prosthodontics, Ankara, Turkey. Electronic address: mervebankoglu@yahoo.com.
authors.forename: Merve
authors.initials: M
authors.lastname: Bankoğlu Güngör
authors.affiliation: Professor, Gazi University, Faculty of Dentistry, Department of Prosthodontics, Ankara, Turkey.
authors.forename: Handan
authors.initials: H
authors.lastname: Yılmaz
mesh_terms: D003442:Crowns; D017266:Dental Prosthesis / Q000379:methods / Q000592:standards; D019094:Dental Prosthesis, Implant-Supported / Q000009:adverse effects / Q000295:instrumentation / Q000379:methods*; D003799:Dental Stress Analysis; D020342:Finite Element Analysis; D006801:Humans; D014025:Titanium / Q000627:therapeutic use*; D015040:Zirconium / Q000627:therapeutic use*
chemical_list: D015040:Zirconium; D014025:Titanium; C028541:zirconium oxide