Evaluation of stress on the periodontium induced by a fixed retraction screw appliance and an active tie-back: A 3-dimensional finite element study
| Autor: | Priyanka Kundoor Unnikrishnan, Arun Kumar Gopal Naik, Vineeth Varadarahan Thundukattil |
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| Jazyk: | angličtina |
| Rok vydání: | 2013 |
| Předmět: |
Materials science
Maxillary dentition business.industry Dentistry Orthodontics Active tie backs Periodontium finite element analysis Finite element study Finite element method Stress (mechanics) lcsh:RK1-715 repetitive active loading medicine.anatomical_structure hycon device lcsh:Dentistry Ultimate tensile strength Premolar medicine Displacement (orthopedic surgery) Composite material business retraction mechanics |
| Zdroj: | APOS Trends in Orthodontics, Vol 3, Iss 6, Pp 178-183 (2013) |
| ISSN: | 2321-1407 |
| Popis: | Objectives: To evaluate the stresses and displacement induced in the periodontium by an active retraction screw device (hycon device) and an active tie back using the finite element analysis. Materials and Methods: A 3-dimensional model of the maxillary dentition was designed for the study. A retraction force of 410 and 200 g was applied to simulate the forces generated by the hycon device and an active tie back respectively. The stresses generated by these forces were evaluated on the periodontium at cervix, mid root and apical region. Results: In the present study, maximum amount of tensile stresses were found on the labio-cervical (0.4919 and 0.2945 MPa) aspects of canine, compressive stresses on the linguo-cervical (−0.1758 and −0.0679 MPa) aspect of the 2 nd premolar and the apical region of all teeth showed low magnitude compressive stresses, with both the loads. The displacement produced by the retraction screw was of the magnitude 0.172-0.183 mm (0.177 mm) in the anterior segment and 0.0065-0.007822 mm (0.0071 mm) in the posteriors (anchor loss). Active tie backs produce a displacement of 0.162-0.172 mm in the anterior segment and a negligible amount of displacement in the posteriors. Conclusions: Even though the stress level in the periodontium produced by hycon device was almost 2-3 times that of active tie backs, the displacement produced per activation was within the physiological limits and less than the width of the periodontium (0.20-0.25 mm), which in turn induces bone remodeling. |
| Databáze: | OpenAIRE |
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