Influence of bicortical techniques in internal connection placed in premaxillary area by 3D finite element analysis

Author(s)

Verri, Fellippo Ramos ; Cruz, Ronaldo Silva ; Araujo Lemos, Cleidiel Aparecido ; de Souza Batista, Victor Eduardo ; Faria Almeida, Daniel Augusto ; Goncales Verri, Ana Caroline ; Pellizzer, Eduardo Piza

• Document type: Journal article
• Source: COMPUTER METHODS IN BIOMECHANICS AND BIOMEDICAL ENGINEERING; v. 20, n. 2, p. 193-200, 2017.
• Web of Science Citations: 2

Abstract

The aim of study was to evaluate the stress distribution in implant-supported prostheses and peri-implant bone using internal hexagon (IH) implants in the premaxillary area, varying surgical techniques (conventional, bicortical and bicortical in association with nasal floor elevation), and loading directions (0 degrees, 30 degrees and 60 degrees) by three-dimensional (3D) finite element analysis. Three models were designed with Invesalius, Rhinoceros 3D and Solidworks software. Each model contained a bone block of the premaxillary area including an implant (IH, empty set 4 x 10 mm) supporting a metal-ceramic crown. 178 N was applied in different inclinations (0 degrees, 30 degrees, 60 degrees). The results were analyzed by von Mises, maximum principal stress, microstrain and displacement maps including ANOVA statistical test for some situations. Von Mises maps of implant, screws and abutment showed increase of stress concentration as increased loading inclination. Bicortical techniques showed reduction in implant apical area and in the head of fixation screws. Bicortical techniques showed slight increase stress in cortical bone in the maximum principal stress and microstrain maps under 60 degrees loading. No differences in bone tissue regarding surgical techniques were observed. As conclusion, nonaxial loads increased stress concentration in all maps. Bicortical techniques showed lower stress for implant and screw; however, there was slightly higher stress on cortical bone only under loads of higher inclinations (60 degrees). (AU)

• FAPESP's process: 11/01045-2 - Evaluation of single-tooth implant supported prostheses with external hexagon, internal hexagon and Morse taper with different types of bone anchorage in the anterior maxilla: study by 3-D finite element analysis
• Grantee: Fellippo Ramos Verri
• Support type: Regular Research Grants
• FAPESP's process: 12/21065-0 - Biomechanical evaluation of internal hexagon implant supported prostheses on anterior maxillary area with different bone anchorages: study by 3-D finite element analysis
• Grantee: Ronaldo Silva Cruz
• Support type: Scholarships in Brazil - Scientific Initiation