Analytical Methods and Finite Element Method Computation The dental - periodontal tissues response

Abstract

The study of the biomechanical behaviour of dental-periodontal structures during orthodontic movement has been carried out on the basis of the analysis of values of equivalent stress following Von Mises theory, of the stress after the direction of the sz vertical force, which constitutes the essential component of the Von Mises equivalent stress, as well as on the basis of registering the deformities on the tooth axis. The processes of implementation, modelling, calculation and interpretation, using FEM, involved the following steps: defining the geometry and the structure of the model under analysis; meshing the geometry of the structure; connecting the nodal elements; defining the limit conditions and restrictions; loading the created model with vertical forces of different intensities; solving the equation system, having as unknowns in the nodes the following: movement, tension, tension on the spatial coordinates, Von Mises stress. We simulated the orthodontic intrusion through the application of some vertical forces with different intensities and on structures with alveolar bone loss. The tension values in the tooth axis vary in direct proportion to the level of resorption of the alveolar bone, but the decisive element is the numerical value of the applied force, and not the absorption level.

Experimental Study on the Improvement of the Use of Diacrylic Composite Resins in Restorative Dentistry by Compensatory Techiniques

“…They are materials of a good quality / price ratio and outstanding physiognomic aesthetics. The composite diacrylic resins (DRCs) used by practitioners in many clinical situations of the restorative dentistry lead to successful results only by appropriately assimilating the techniques of manipulating these materials and by observing the restoration work technology [9][10][11][12][13].…”