Apical stress distribution on maxillary central incisor during various orthodontic tooth movements by varying cemental and two different periodontal ligament thicknesses: A FEM study
| Autor: | K. S. Nagachandran, N Raj Vikram, KS Senthil Kumar, Y Mohamed Hashir |
|---|---|
| Rok vydání: | 2012 |
| Předmět: |
Adult
Materials science Adolescent Rotation Tooth Movement Techniques Periodontal Ligament Dentistry Context (language use) finite element analysis Models Biological Stress (mechanics) Imaging Three-Dimensional Tooth Apex Cemental stress stomatognathic system Alveolar Process Maxilla PDL stress Dentin medicine Humans Periodontal fiber Computer Simulation Maxillary central incisor Cementum Dental Enamel General Dentistry Dental Pulp Dental alveolus Dental Cementum Orthodontics FEM Orthodontic Extrusion Enamel paint business.industry General Medicine Biomechanical Phenomena Incisor lcsh:RK1-715 stomatognathic diseases medicine.anatomical_structure lcsh:Dentistry visual_art visual_art.visual_art_medium Stress Mechanical root resorption business |
| Zdroj: | Indian Journal of Dental Research, Vol 23, Iss 2, Pp 213-220 (2012) |
| ISSN: | 0970-9290 |
| DOI: | 10.4103/0970-9290.100429 |
| Popis: | Context: During fixed orthodontic therapy, when the stress levels in the periodontal ligament (PDL) exceedsan optimum level, it could lead to root resorption. Aims: To determine an apical stress incident on the maxillary central incisor during tooth movement with varying cemental and periodontal ligament thickness by Finite Element Method (FEM) modeling. Settings and Design: A three dimensional finite element model of a maxillary central incisor along with enamel, dentin, cementum, PDL and alveolar bone was recreated using EZIDCOM and AUTOCAD software. ALTAIR Hyper mesh 7.0 version was used to create the Finite Element meshwork of the tooth. This virtual model was transferred to Finite Element Analysis software, ANSYS where different tooth movements were performed. Materials and Methods: Cemental thickness at the root apex was varied from 200 μm to 1000 μm in increments of 200 μm. PDL thickness was varied as 0.24 mm and 0.15 mm. Intrusive, Extrusive, Rotation and Tipping forces were delivered to determine an apical stress for each set of parameters. Results: Results indicated that an apical stress induced in the cementum and PDL, increased with an increase in cementum and PDL thickness respectively. Apical stress induced in the cementum remained the same or decreased with an increase in the PDL thickness. Apical stress induced in the PDL decreased with an increase in the cementum thickness. Conclusion: The study concluded that the clinical delivery of an orthodontic forces will cause stress in the cementum and PDL. Hence, it is necessary to limit the orthodontic force to prevent root resorption. |
| Databáze: | OpenAIRE |
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