Study of stress-strain state of an individual titanium mesh for directed bone regeneration

A popular task in modern dentistry is dental implantation with immediate temporary prosthet-ics. In the work, a complex structure was studied using the finite element method, including a fixed individual perforated titanium mesh with four abutment supports via screws on the lower jaw and a bridge-like fixed dental prosthesis fixed on these supports. Several options for fixing the mesh with a vertical load of 100 N and the same at an angle of 45° from the lingual side to the occlusal surface of one, two and several teeth were considered. Due to the complexity of the geometry of the entire structure, the task was divided into 3 stages of solution. At the first stage, the problem was solved with only one titanium mesh (to test the possibility of using fewer screws), at the second stage – a titanium mesh with a fixed dental prosthesis, and at the third stage – the entire structure, including screws with which the mesh with the prosthesis is fixed to the jawbone. As a result of the numerical solution of the contact problem, the minimum number of screws was determined (for less trauma to patients) and the distribution of displacements and stresses according to von Mises of all components of the structure was obtained. The main ob-jective was to determine the maximum displacements of the upper surface of the mesh, which turned out to be very insignificant in all variants, which is important to prevent pressure on the osteoplastic material placed inside the mesh, replacing the lost bone tissue. The maximum stress values in the cortical and spongy bones turned out to be significantly lower than their ultimate strength, so destruction will not occur in them in either the first or second variant.