STRESS DISTRIBUTION IN THE NASOMAXILLARY COMPLEX FOLLOWING APPLICATION OF ORTHOPAEDIC HEADGEAR FORCES- A 3-DIMENSIONAL FEM STUDY
Journal Title: Journal of Evolution of Medical and Dental Sciences - Year 2017, Vol 6, Issue 91
Abstract
BACKGROUND Extraoral force has been in use in orthodontics since Cellier introduced it in early 1800s. Like many other treatment modalities, interest in headgears and the understanding of its probable effect has varied over the years. From only dental changes to skeletal changes affecting the cranial base structures as well, all have been attributed to headgear use at various times. At present, it is well established that headgears have a retarding effect on the growth and development of maxilla. However, the exact biomechanical effect of different force directions on the sutural response is still under consideration. MATERIALS AND METHODS The present study was undertaken to examine the effect of posteriorly directed headgear forces on the various nasomaxillary sutures. FEM model was created having 236685 elements and 56052 nodes and 1 Kgf force was applied at -300, 00, 300, 52.40 and 600 to the functional occlusal plane. RESULTS 1. In loading with forces in 52.40 and 600 superior directions, compressive stresses were similarly generated in most anatomic areas and both the normal and shear stresses reduced and exhibited a convergence to a certain level. 2. As the force direction approached that of the CRe, mean principal stresses approached a uniform level of compressive stress. 3. Maximum strain or displacement of all the sutures was observed at a force direction of -300. Strain approached to a minimum level at a force direction of 300 and 52.40. CONCLUSION These findings show that the stress distribution in the sutures varies in relation to the direction of force. Force applied in the direction closest to that of the CRe may produce the most effective sutural modification for controlling maxillary growth. This is an observational study
Authors and Affiliations
Suruchi Seth, Shivalinga B. M, Sunil Seth, Gurinderjit Singh Nagi
Keywords
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