Determining the effect of the angle between the ITI implant long axis and its load on stress distribution and magnitude in peri-implant bone using finite element analysis

Ever-increasing use of dental implants and the changes they have brought about in patients’ lives have prompted many studies on dental implants. The aim of this study was to investigate the effect of a 100-mpascal force at different load angles on stress distribution in implant‒jaw assembly, using finite element analysis.
In this experimental analytical study, a three dimensional model consisting of the mandible and a narrow-neck ITI implant was used. Peri-implant stress was evaluated at three points of A (implant neck), B (the middle of the implant) and C (implant apex). The load was applied from 0° to 30° on the implant with a 5° increase rate of the angle. Analysis of data was carried out with one-way ANOVA and Friedman test (α = 0.05).
Increasing the angle of load from 0W to 30° increased the stress around the implant. At all the angles the amount of stress in the implant neck was higher than the middle area, which in turn was higher than the apical area.
An increase in the load angle resulted in the highest amount of stress in the implant neck, i.e. the closest area to the force application site and away from the center of resistance, with the least stress in the apical area.