Simulations Using Finite Element Method Made on a Personalized Dental System

Abstract

The human skull and the maxillary bones have a very complicated architecture, determined by the outer walls, by the internal bone structures and their joining. In this paper CAD parametric software has been used to define complex virtual models. First, the mandible and jaw were defined using CT images. These images were imported into a CAD software using specific techniques and methods. These models have been finalized in SolidWorks where the virtual model of the studied system has been generated. Then, the virtual models were exported to a software for FEA simulation and prepared for every dentistry simulations. The structure of the maxillary bones contains spongy bone tissue, cortical bone tissue along with dental tissues. Each of these tissues have certain properties (elasticity, plasticity, density) assessed by flexibility. The analysis of the mechanical tension of the dental structures has been a subject of interest in recent years in order to determine the state of tension in the dental structures and to improve the mechanical strength of these structures. Such numerical techniques can give a better understanding of reactions and interactions of individual tissues. This involves a series of computational procedures to calculate stress in each element. Field variables can be interpolated by using form functions for scientific verification and validation of clinical assumptions. Various loadings have been applied to a personalized skull obtained from CT images using CAD techniques and procedures. On this system, FEM simulations were made and maps of stress, displacements and deformations were obtained that show the mechanical behavior of the maxillary dental system. Finally, important conclusions were highlighted.

Modeling and Simulation of an Orthodontic System of a Real Patient Starting from CBCT Images

“…14) and deformation energies (Fig. 15) were obtained, similar simulations in [12][13][14][15][16][17][18][19][20][21].…”

“…To obtain the patient's dental geometry, CBCT images made before the first orthodontic wires were used. The InVesalius program was used, which, based on the shades of gray in the images, creates three-dimensional geometric structures by choosing different tissue filter from the program's database [12][13][14][15][16][17][18]. Thus, by choosing from the program menu, Bone type filter, the primary geometry for such structures can be obtained as can be seen in Fig.…”

“…The model obtained in InVesalius was exported to Geomagic for processing and editing. The Geomagic program is mainly used for processing 3D scans or files containing so-called "point clouds", using Reverse Engineering techniques [3][4][5][6][7]. This model, in the primary phase, is shown in Fig.…”

“…The association of new medical imaging techniques in orthodontic practice has led to further studies on craniofacial development. These investigations include optical coherence tomography (OCT) and computed tomography (CBCT) [1][2][3][4][5][6][7][8][9][10][11].…”

A Personalized Three-Dimensional Model of a Patient Using CT Images

“…Figure 1 shows the interface of this program after loading the CT images, choosing the type of tissue analyzed (in this case -Bone) and transforming it into a primary three-dimensional model, based on surfaces [4][5][6][7][8].…”