Volume 6 Issue 5 (September -October), 2020

Original Articles

Evaluation of stresses produced around the root of teeth with different orthodontic treatment approaches
Harinarayan Dhaka, Lokendra Singh Dagur, Prakhar Pathak, Aanchal Agarwal

Background: Orthodontic mini-implants (OMIs) are used for various anchorages. For treatment of bialveolar protrusion, anchorage preservation during space closure is important for maximum retraction of the anterior teeth after premolar extractions. OMIs have been reported to be effective anchorage for en-masse space closure. When using mini implants we must understand the stress and strain distribution in the bone around the implant. Stability of the mini-implant again relies on degree of inflammation, accompanying local irritation, quality and quantity of cortical bone, proximity of mini-implant to the roots of adjacent teeth. Aim of the study: To evaluate the stresses produced around the root of teeth, when placed at different distances from the root of the maxillary first molar and to evaluate the influence of the magnitude of the force applied on the resultant stresses generated. Materials and methods: The present study was conducted in the Department of Orthodontics of the Dental institution. The ethical clearance for the study was approved from the ethical committee of the hospital. Finite element modeling is the representation of geometry in terms of a finite number of elements and their connection points known as nodes. These are the building blocks of numerical representation of the model. The elements present are of finite number as opposed to a theoretical model with complete continuity. Results: On comparing all the teeth with different forces, the highest maximum stress was to be found in the second molar by varying implant placement height, with and without Curve of Spee. On comparing all the teeth with different forces, the highest maximum stress was found in the second molar followed by first molar, second premolar, lateral incisor, central incisor and then canine in varying implant placement height with & without Curve of Spee. On comparing all the teeth with different forces, the highest maximum stress was found at 16mm implant height compared to 13mm and 10mm implant height anterior to the extraction space. Conclusion: Within the limitations of the present study, it can be concluded that irrespective of the height of implant placement, the maximum stress generated on the root surface was at the last molar included in the set up in the second molar. Anterior to the extraction space, the stress increases as the implant height increases and the posterior to extraction space stress increases as the implant height decreases. This can be attributed to greater stress generated by the larger vertical component anteriorly and larger horizontal component posteriorly. Keywords: Dental protrusion, Orthodontic treatment, mini implant, maximum force

 
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