Effect of Titanium Hardness on the Integrity and Stress Concentration of External Hexagon Dental Implants

Autor(es)

Alecsandro de Moura Silva ^[1] ; Jefferson David Melo de Matos ; João Paulo Mendes Tribst ^[3] ; Guilherme da Rocha Scalzer Lopes ^[4] ; Carolina da Silva Machado Martinelli ^[5] ; Alexandre Luiz de Souto Borges ^[6] ; Estevão Tomomitsu Kimpara ^[7] ; Lafayette Nogueira-Junior ^[8] ; Renata Marques de-Melo ^[9] ; Marco Antonio Bottino ^[10]

Afiliação do(s) autor(es)

^[1] University of Taubaté. Department of Dentistry - Brasil

^[3] University of Taubaté. Department of Dentistry - Brasil

^[4] São Paulo State University. Department of Dental Materials and Prosthodontics. Institute of Science and Technology - Brasil

^[5] São Paulo State University. Department of Dental Materials and Prosthodontics. Institute of Science and Technology - Brasil

^[6] São Paulo State University. Department of Dental Materials and Prosthodontics. Institute of Science and Technology - Brasil

^[7] São Paulo State University. Department of Dental Materials and Prosthodontics. Institute of Science and Technology - Brasil

^[8] São Paulo State University. Department of Dental Materials and Prosthodontics. Institute of Science and Technology - Brasil

^[9] São Paulo State University. Department of Dental Materials and Prosthodontics. Institute of Science and Technology - Brasil

^[10] São Paulo State University. Department of Dental Materials and Prosthodontics. Institute of Science and Technology - Brasil

• Tipo de documento: Artigo Científico
• Fonte: Int. J. Odontostomat.; v. 15, n. 4, p. 1053-1059, 2021-12-00.

Resumo

ABSTRACT: The aim of this study was to evaluate the influence of overtorque on integrity, strength and stress on external hexagonal implants (EH), with two different grades (N=10): conventional (C), grade 4; and modified (M), grade 4 with thermal treatment. The dimensions of EH were 3.75 x 13 mm; the specimens were fixed and submitted to SEM analysis and image acquisition. The abutment was then retained with 70 N/cm, re-analyzed by SEM, and a second image was obtained. The images were analyzed by Image J software (1.44o- NIH, USA) for dimensional variations measurement on surface of the hexagonal area. The finite element method was applied with a similar compliance to calculate the resultant stress (MPa) during the torque. Results were statistically analyzed with t-student test (5 %). The dimensional accuracy of M (0.22 mm2) was statistically significant (p<0.05). Minimum principal stress and von-Mises stress of C (-19.95 MPa, -19.94 MPa), were lower than M values (-55.83 MPa, -55.96 MPa), respectively. However, the M group showed lower deformation than C group. Therefore, more rigid titanium alloy is a promising alternative to avoid plastic deformation of prosthetic connec tions even concentrating higher stress magnitude on its structure. (AU)

• Processo FAPESP: 19/24903-6 - Análise comparativa entre implantes de titânio e cerâmica policristalina, na sobrevivência em fadiga e comportamento biomecânico
• Beneficiário: Jefferson David Melo de Matos
• Modalidade de apoio: Bolsas no Brasil - Doutorado