Alecsandro de Moura Silva; Jefferson David Melo de Matos; João Paulo Mendes Tribst; Guilherme da Rocha Scalzer Lopes; Carolina da Silva Machado Martinelli; Alexandre Luiz de Souto Borges; Estevão Tomomitsu Kimpara; Lafayette Nogueira Junior; Renata Marques de Melo & Marco Antonio Bottino
Summary
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 × 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 connections even concentrating higher stress magnitude on its structure.
KEY WORDS: dental implants, finite element analysis, dental alloys.
How to cite this article
SILVA, A. M.; MATOS, J. D. M.; TRIBST, J. P. M.; LOPES, G. R. S.; MARTINELLI, C. S. M.; BORGES, A. L. S., KIMPARA, E. T.; NOGUEIRA JR, L.; DE MELO, R. M. & BOTTINO, M. A. Effect of titanium hardness on the integrity and stress concentration of external hexagon dental implants. Int. J. Odontostomat., 15(4):1053-1059, 2021.