Vol.23, No.1, 2023, pp. 70–74
UDC:

In this paper, elastic-plastic transition stresses have been analytically characterized in titanium and zirconia based crowns of dental implants. The crown of the implant is modelled in the form of a hemispherical shell which possesses transversely isotropic material behaviour. Seth’s transition theory has been implemented to model the elastic-plastic stress state. The hemispherical shell so modelled is subjected to external pressure to analyse the state of compression. The results for titanium and zirconia based implant are compared with hydroxyapatite (HAP), Ca₁₀(PO₄)₆(OH)₂, mineral present in the enamel and dentine of molars and premolars. Elastic stiffness constants for these are taken from the available literature, and obtained using ultrasonic resonance spectroscopy, a non-destructive technique of obtaining stiffness constants. Radial and circumferential stresses are obtained for radii ratios which can handle any type of dataset for crown thicknesses.

Keywords: titanium, zirconia, hydroxyapatite, implants, stresses