Ritu Duggal
CDER All India Institute of Medical Sciences, India
Title: Skeletal and dentoalveolar effects of Twin-block appliances in the treatment of Class II malocclusion: finite element analysis
Biography
Biography: Ritu Duggal
Abstract
Introduction: The aim of the research project was to evaluate and analyze the stress and its areas, displacement and force generated in the human mandible, following Twin Block therapy through 3 dimensional finite element analysis.
Methods: A 3D finite element model of the mandible was constructed from the Ct Scan of a patient who had undergone twin block therapy and had achieved Class I molar relation or had completed at least six months of treatment. Mimics and Ansys
software were used for 3D Model generation. In the 3D finite element model the magnitude and direction of the muscle force attached to the mandible were entered in all the three planes i.e. x,y,z respectively. The length in x plane was 105.44mm length
in y plane was 75.823 mm and in the z plane was 94.364mm. The volume of the geometry was 46066 mm³ and mass was 4.6112e+.006 kg
Results: The entire mandible was moved antero-inferiorly. The antero inferior displacement of the mandibular dentition was
most pronounced in the incisor region. The entire dentition experienced tensile stress. Maximum tensile stress and von Mises stresses were occurred in the condylar neck and head. The force generated was 101.76 N.
Conclusions: The tensile stresses on the condyle were suggestive of biomechanical effects of the twin block appliance, role of condylar cartilage and lateral pterygoid muscle on the growth of the mandible after functional appliances. The displacement suggested that the entire mandible moved antero inferiorly and the force generated suggested that activating the muscle attached to the mandible could bring the changes in the direction of growth.