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

Autor(es)

Almeida, Erika O. ; Rocha, Eduardo P. ; Freitas Junior, Amilcar C. ; Anchieta, Rodolfo B. ; Poveda, Ronald ; Gupta, Nikhil ; Coelho, Paulo G.

• Tipo de documento: Artigo Científico
• Fonte: CLINICAL IMPLANT DENTISTRY AND RELATED RESEARCH; v. 17, p. 11-pg., 2015-01-01.

Resumo

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)

• Processo FAPESP: 09/09075-8 - Influência do número e inclinação dos implantes para a ancoragem de prótese fixa em maxila atrófica: estudo comparativo com elementos finitos não-linear 3D
• Beneficiário: Erika Oliveira de Almeida
• Modalidade de apoio: Bolsas no Brasil - Doutorado