Trend of x tensions

Trend of y tensions

The results of this analysis cannot be compared with the previous analyses for a number of reasons:
-In The volume of the chin bone was not discretised in this model, resulting in the alteration of both the geometry and the disposition of the constraints (the chin zone is no longer constrained against translations along X and Y);
- The discretisation of the superior part of the mandible was achieved using a degree of thickening equal to 8, whereas it was equal to 1 in earlier studies (maximum degree of “meshing”): this choice had a minor incidence on the results.
1- in the punctual evaluation, given that the elements are generally laid out in a more orderly way, without local concentrations leading to consequent peaks of tension, but the corresponding nodes are much further from the holes than in previous cases,
2- in the graphic evaluation because, again for the same reason, the distribution of tensions is influenced by the presence of screws and also by the greater distance between the nodes, leading to a consequent increase in grey zones and the extreme tones around the holes;
- There is a marked increase in tensional status around the central hole; this can probably be attributed to the fact that the mandible is unbalanced by keeping the central screw embedded in cancellous bone, with a more yielding part flanked by two much more rigid areas, leading to a concentration of stress in the weakest zone.