title: Biomechanical influence of crown-to-implant ratio on stress distribution over internal hexagon short implant: 3-D finite element analysis with statistical test.
abstract: The study of short implants is relevant to the biomechanics of dental implants, and research on crown increase has implications for the daily clinic. The aim of this study was to analyze the biomechanical interactions of a singular implant-supported prosthesis of different crown heights under vertical and oblique force, using the 3-D finite element method. Six 3-D models were designed with Invesalius 3.0, Rhinoceros 3D 4.0, and Solidworks 2010 software. Each model was constructed with a mandibular segment of bone block, including an implant supporting a screwed metal-ceramic crown. The crown height was set at 10, 12.5, and 15 mm. The applied force was 200 N (axial) and 100 N (oblique). We performed an ANOVA statistical test and Tukey tests; p<0.05 was considered statistically significant. The increase of crown height did not influence the stress distribution on screw prosthetic (p>0.05) under axial load. However, crown heights of 12.5 and 15 mm caused statistically significant damage to the stress distribution of screws and to the cortical bone (p<0.001) under oblique load. High crown to implant (C/I) ratio harmed microstrain distribution on bone tissue under axial and oblique loads (p<0.001). Crown increase was a possible deleterious factor to the screws and to the different regions of bone tissue.
authors.affiliation: Department of Dental Materials and Prosthodontics, Aracatuba Dental School, UNESP-Univ Estadual Paulista, Aracatuba, SP, Brazil. Electronic address: fellippo@gmail.com.
authors.forename: Fellippo
authors.initials: F
authors.lastname: Ramos Verri
authors.affiliation: Department of Dental Materials and Prosthodontics, Aracatuba Dental School, UNESP-Univ Estadual Paulista, Aracatuba, SP, Brazil.
authors.forename: Joel Ferreira
authors.initials: JF
authors.lastname: Santiago Junior
authors.affiliation: Department of Dental Materials and Prosthodontics, Aracatuba Dental School, UNESP-Univ Estadual Paulista, Aracatuba, SP, Brazil.
authors.forename: Daniel Augusto
authors.initials: DA
authors.lastname: de Faria Almeida
authors.affiliation: Department of Dental Materials and Prosthodontics, Aracatuba Dental School, UNESP-Univ Estadual Paulista, Aracatuba, SP, Brazil.
authors.forename: Guilherme Bérgamo Brandão
authors.initials: GB
authors.lastname: de Oliveira
authors.affiliation: Department of Dental Materials and Prosthodontics, Aracatuba Dental School, UNESP-Univ Estadual Paulista, Aracatuba, SP, Brazil.
authors.forename: Victor Eduardo
authors.initials: VE
authors.lastname: de Souza Batista
authors.affiliation: Department of Pediatrics Dentistry, Orthodontics and Public Health, Discipline of Research Methodology and Statistics, University of São Paulo, Bauru, SP, Brazil.
authors.forename: Heitor
authors.initials: H
authors.lastname: Marques Honório
authors.affiliation: Renato Archer Research Center (CTI), Campinas, SP, Brazil.
authors.forename: Pedro Yoshito
authors.initials: PY
authors.lastname: Noritomi
authors.affiliation: Department of Dental Materials and Prosthodontics, Aracatuba Dental School, UNESP-Univ Estadual Paulista, Aracatuba, SP, Brazil.
authors.forename: Eduardo Piza
authors.initials: EP
authors.lastname: Pellizzer
mesh_terms: D015921:Dental Implants; D017267:Dental Prosthesis Design; D019094:Dental Prosthesis, Implant-Supported; D020342:Finite Element Analysis; D006801:Humans; D008334:Mandible; D008962:Models, Theoretical; D013314:Stress, Mechanical; D016474:Weight-Bearing
chemical_list: D015921:Dental Implants
keywords: Analysis of variance; Biomechanics; Dental implants; Finite element analysis; Implant-Supported Prosthesis Dental