Authors : Dr. Kratika Mishraa, Dr. P.G. Makhija
DOI : 10.18231/j.jco.2017.004
Volume : 1
Issue : 2
Year : 2017
Page No : 28-33
Objective: Evaluation of distribution of stresses in human mandible generated during clenching in various malocclusion groups like class I, II, III malocclusion for better diagnosis and treatment and rearrangement of teeth to distribute forces.
Materials and methods: 3D anatomical models were generated using DICOM images from CBCT scans. These jaw models were exported using STL format. Such models were developed from class I, II, III malocclusion Cone Beam Computed Tomography (CBCT) data. Complete model was saved as .stl file which were imported in HyperMesh software to generate volume mesh from surface volume by refining the mesh volume of each
part of all cases.
Result: In CLASS I MALOCCLUSION the stress trajectories were observed from beneath the teeth in the alveolar process, lower border of mandible. The stress was homogeneously distributed throughout the mandibular body, symphysis region, ramus, gonial angle. In CLASS II MALOCCLUSION, the high concentration of stress is seen on symphysis region and beneath the posterior crest of alveolar bone. In case of CLASS III malocclusion, the force is not homogeneously distributed throughout entire mandibular body and was observed more in the ramus of the mandible and posterior part even the coronoid process.The low amount of stress was observed in anterior part of mandible and on condylar head.
Conclusion: Various Von Mises stress distributions trajectories and stress patterns were observed in different classes of malocclusion i.e. in class I, II, III malocclusion in cases with normal maxilla and skeletal class I, II, III malocclusion
Keywords: CBCT, DICOM, Finite element analysis,Regional thresholding,Von Mises stress,Trajectories.