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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Tilted and Short Implants Supporting Fixed Prosthesis in an Atrophic Maxilla: A 3D-FEA Biomechanical Evaluation

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Author(s):
Almeida, Erika O. [1] ; Rocha, Eduardo P. [2] ; Freitas Junior, Amilcar C. [3] ; Anchieta, Rodolfo B. [2] ; Poveda, Ronald [4] ; Gupta, Nikhil [4] ; Coelho, Paulo G. [5]
Total Authors: 7
Affiliation:
[1] Univ Fed Rio Grande do Norte, Dept Dent, BR-59072970 Natal, RN - Brazil
[2] Sao Paulo State Univ, Aracatuba Sch Dent, Dept Dent Mat & Prosthodont, Sao Paulo - Brazil
[3] Univ Potiguar, Sch Dent, Postgrad Program Dent, Natal, RN - Brazil
[4] NYU, Polytech Inst, Dept Mech & Aerosp Engn, New York, NY - USA
[5] NYU, Coll Dent, Dept Biomat & Biomimet, New York, NY - USA
Total Affiliations: 5
Document type: Journal article
Source: CLINICAL IMPLANT DENTISTRY AND RELATED RESEARCH; v. 17, n. 1, p. E332-E342, JAN 2015.
Web of Science Citations: 19
Abstract

PurposeThis study compared the biomechanical behavior of tilted long implant and vertical short implants to support fixed prosthesis in an atrophic maxilla. Materials and MethodsThe maxilla model was built based on a tomographic image of the patient. Implant models were based on micro-computer tomography imaging of implants. The different configurations considered were M4S, four vertical anterior implants; M4T, two mesial vertical implants and two distal tilted (45 degrees) implants in the anterior region of the maxilla; and M6S, four vertical anterior implants and two vertical posterior implants. Numerical simulation was carried out under bilateral 150N loads applied in the cantilever region in axial (L1) and oblique (45 degrees) (L2) direction. Bone was analyzed using the maximum and minimum principal stress (sigma(max) and sigma(min)), and von Mises stress (sigma(vM)) assessments. Implants were analyzed using the sigma(vM). ResultsThe higher sigma(max) was observed at: M4T, followed by M6S/L1, M6S/L2, M4S/L2, and M4S/L1 and the higher sigma(vM): M4T/L1, M4T/L2 and M4S/L2, M6S/L2, M4S/L1, and M6S/L1. ConclusionsThe presence of distal tilted (all-on-four) and distal short implants (all-on-six) resulted in higher stresses in both situations in the maxillary bone in comparison to the presence of vertical implants (all-on-four). (AU)

FAPESP's process: 09/09075-8 - Influence of number and angulation of implants to support fixed prosthesis in atrophic maxilla: comparative non-linear study using 3D finite element
Grantee:Erika Oliveira de Almeida
Support type: Scholarships in Brazil - Doctorate