Vlerësimi i stresit të shfaqur në nofullën e sipërme nga vidat ortodontike nga çeliku dhe zirkoni

This research aims to evaluate the pressure exerted on the upper jaw by steel and zirconium orthodontic screws using finite element analysis. Based on this, two working models were built in which the mechanical processing and dimen- sions of the orthodontic screws were not changed, and two orthodontic screws were placed from the biomaterial steel and zircon. In this study, a scenario of a case treated with extraction was selected, in which the first premolar was extracted, and the canine retraction was performed on continuous arches (steel 0.0016 x 0.0022) and with brackets of 0.0018’’ slot size. Orthodontic screws is placed between the second premolar and the first molar. A closed spring is suspended from the canine in the direction of or- thodontic screw, which applied a force of 1N. Referring to the achieved results, the value of the maximum principal stress (Pmax), in the cortical bone, was identified in or- thodontic screw made of steel, i.e., zirconium. While the value of the maximum principal stress (Pmax), in trabecu- lar bone, has been identified in steel and zirconium. Based on the conclusions of this research, zirconium may also be used for the production of orthodontic screws.