title: Evaluation of stress distributions in peri-implant and periodontal bone tissues in 3- and 5-unit tooth and implant-supported fixed zirconia restorations by finite elements analysis.
abstract: OBJECTIVE
  In this study, it is aimed to compare the distribution of stress on periodontal and peri-implant bone tissues in 3- and 5-unit-dental and implant-supported zirconia restorations using finite element analysis.
  
  
  METHODS
  Stress distribution formed in periodontal and peri-implant bone tissues as a result of chewing forces was analyzed in dental and implant-supported three-dimensional (3D) finite element models of zirconia restoration with 5-unit placed on the numbers of 43, 44, 45, 46, and 47 and with 3-unit placed on the number of 45, 46, and 47. Four different loading conditions were used. 200 N force was applied in 30° from the buccal inclination of number 43, 45, and 47 restorations separately and totally 850 N force was applied in 30° from the buccal inclination of whole restoration. The study was performed through static nonlinear analysis with the 3D finite element analysis method.
  
  
  RESULTS
  Stress accumulation in bone tissues in the tooth-supported model was found less than in implant-supported models. Stress accumulation was observed in the cervical portion of the implant in implant-supported models, and stress accumulation was observed surrounding bone of roots in tooth-supported models. The highest stress values were occurred in 5 unit implant-supported model in all loadings.
  
  
  CONCLUSIONS
  In posterior restorations increased in the number of supported teeth and implant can reduce the destructive forces on periodontal and peri-implant bone tissues and may allow longer period retention of the restorations in the mouth.
authors.affiliation: Department of Prosthetic Dentistry, Faculty of Dentistry, Dicle University, Diyarbakir, Turkiye.
authors.forename: Sedat
authors.initials: S
authors.lastname: Guven
authors.affiliation: Department of Prosthetic Dentistry, Faculty of Dentistry, Dicle University, Diyarbakir, Turkiye.
authors.forename: Koksal
authors.initials: K
authors.lastname: Beydemir
authors.affiliation: Department of Periodontology, Faculty of Dentistry, Firat University, Elazig, Turkiye.
authors.forename: Serkan
authors.initials: S
authors.lastname: Dundar
authors.affiliation: Department of Prosthetic Dentistry, Ministry of Health, Diyarbakir Oral and Dental Health Center, Diyarbakir, Turkiye.
authors.forename: Veysel
authors.initials: V
authors.lastname: Eratilla
keywords: Finite element analysis; implant-supported prosthesis; peri-implant and periodontal bone; tooth-supported prosthesis; zirconia restorations