title: The influence of bone quality on the biomechanical behavior of full-arch implant-supported fixed prostheses.
abstract: We evaluated the influence of bone tissue type on stress distribution in full-arch implant-supported fixed prostheses using a three-dimensional finite element analysis. Stresses in cortical and trabecular bones were also investigated. Edentulous mandible models with four implants inserted into the interforaminal region were constructed from different bone types: type 1 - compact bone; type 2 - compact bone surrounding dense trabecular bone; type 3 - a thin layer of compact bone surrounding trabecular bone; and type 4 - low-quality trabecular bone. The mandible was restored with a full-arch implant-supported fixed prosthesis. A 100-N oblique load was applied to the left lower first molar of the prosthesis. The maximum (σmax) and minimum (σmin) principal stress values were determined. The σmax in the type 4 cortical bone was 22.56% higher than that in the type 1 bone. The σmin values in the cortical bone were similar among all the bone types. For the superstructure, increases of 9.04% in the σmax and 11.74% in the σmin in G4 (type 4 bone) compared with G1 (type 1 bone) were observed. For the implants, the highest stress values were located in G4, and the lowest values were observed in G1. In the trabecular bone, the highest stress was generated in G1 and G2. In conclusion, the more compact bones (types 1 and 2) are the most suitable for supporting full-arch implant-supported fixed prostheses, and poor bone quality may increase the risk of biological and mechanical failure.
authors.affiliation: Department of Surgery and Integrated Clinic, Aracatuba Dental School, Univ Estadual Paulista (UNESP), José Bonifácio 1193, Araçatuba, São Paulo 16015-050, Brazil; Department of Dental Materials and Prosthodontics, Araçatuba Dental School, Univ Estadual Paulista (UNESP), José Bonifácio 1193, Araçatuba, São Paulo 16015-050, Brazil.
authors.forename: Leonardo Perez
authors.initials: LP
authors.lastname: Faverani
authors.affiliation: Department of Prosthodontics and Periodontology, Piracicaba Dental School, University of Campinas (UNICAMP), Av Limeira, 901, Piracicaba, São Paulo, 13414-903, Brazil. Electronic address: barao@fop.unicamp.br.
authors.forename: Valentim Adelino Ricardo
authors.initials: VA
authors.lastname: Barão
authors.affiliation: Department of Surgery and Integrated Clinic, Aracatuba Dental School, Univ Estadual Paulista (UNESP), José Bonifácio 1193, Araçatuba, São Paulo 16015-050, Brazil.
authors.forename: Gabriel
authors.initials: G
authors.lastname: Ramalho-Ferreira
authors.affiliation: Department of Dental Materials and Prosthodontics, Araraquara Dental School, Univ Estadual Paulista (UNESP), Humaitá, 1680, Araraquara, São Paulo, 14801-903, Brazil.
authors.forename: Juliana Aparecida
authors.initials: JA
authors.lastname: Delben
authors.affiliation: Department of Dental Materials and Prosthodontics, Araçatuba Dental School, Univ Estadual Paulista (UNESP), José Bonifácio 1193, Araçatuba, São Paulo 16015-050, Brazil.
authors.forename: Mayara Barbosa
authors.initials: MB
authors.lastname: Ferreira
authors.affiliation: Department of Surgery and Integrated Clinic, Aracatuba Dental School, Univ Estadual Paulista (UNESP), José Bonifácio 1193, Araçatuba, São Paulo 16015-050, Brazil.
authors.forename: Idelmo Rangel
authors.initials: IR
authors.lastname: Garcia Júnior
authors.affiliation: Department of Dental Materials and Prosthodontics, Araçatuba Dental School, Univ Estadual Paulista (UNESP), José Bonifácio 1193, Araçatuba, São Paulo 16015-050, Brazil.
authors.forename: Wirley Gonçalves
authors.initials: WG
authors.lastname: Assunção
mesh_terms: D001842:Bone and Bones / Q000737:chemistry* / Q000000981:diagnostic imaging; D015921:Dental Implants; D055119:Elastic Modulus; D020342:Finite Element Analysis; D006801:Humans; D007575:Jaw, Edentulous; D008297:Male; D008334:Mandible; D008875:Middle Aged; D013314:Stress, Mechanical; D014057:Tomography, X-Ray Computed
chemical_list: D015921:Dental Implants
keywords: Dental implants; Finite element analysis; Prostheses and implants