Introduction. The Finite Elements Method (FEM) is a high-precision computer-assisted numerical technique used in the accurate investigation and identification of structural stress, based on the physical properties of the analyzed structure and of the movements caused by the action of various external factors acting on a body. Aim. This study was designed to evaluate the predictability of molar uprighting in a context with affected supporting periodontium. Materials and methods. Using Catia V5R19 and Abaqus analysis software we developed a mandibular model that reproduced with high accuracy the clinical situation in which we have a mandibular second molar, with different angulations of inclination, that requires orthodontic treatment for uprighting associated with periodontal disease. Results. The values of σ echincrease significantly together with the increase in force, remaining however below those corresponding to periodontal disease. Evaluating σ c as a function of the magnitude of the applied force shows significantly higher values in the tooth-periodontal ligament-alveolar bone system in the case of a 5,5 mm HBL. The value of f shows a significant linear growth (H=52.82, p<<0.001) in the presence of periodontal disease compared to the situation without periodontal disease. Discussion. In the case of molars affected by periodontal disease we have noted that a greater angle of inclination will induce a very slightly diminished periodontal stress, but it will necessarily be accompanied by a smaller dental movement. Conclusions. An angulation under 30 degrees is not a restrictive aspect for the molar uprighting and has no different influence at the periodontal level regardless its’ status.
Keywords:- finite elements method
- molar uprighting.
- PERIODONTAL DISEASE