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Stress Induced in the Periodontal Ligament under Orthodontic Loading (Part I): A Finite Element Method Study Using Linear Analysis.

Hemanth M, Deoli S, Raghuveer HP, Rani MS, Hegde C, Vedavathi B - J Int Oral Health (2015)

Bottom Line: A three-dimensional (3D) FEM model of the maxillary incisors was generated using SOLIDWORKS modeling software.It was observed that with the application of intrusive load compressive stresses were distributed at the apex whereas tensile stress was seen at the cervical margin.With the application of lingual root torque maximum compressive stress was distributed at the apex and tensile stress was distributed throughout the PDL.

View Article: PubMed Central - PubMed

Affiliation: Professor and Head, Department of Orthodontics and Dentofacial Orthopedics, Dayananda Sagar College of Dental Sciences, Bengaluru, Karnataka, India.

ABSTRACT

Background: Orthodontic tooth movement is a complex procedure that occurs due to various biomechanical changes in the periodontium. Optimal orthodontic forces yield maximum tooth movement whereas if the forces fall beyond the optimal threshold it can cause deleterious effects. Among various types of tooth movements intrusion and lingual root torque are associated with causing root resoprtion, especially with the incisors. Therefore in this study, the stress patterns in the periodontal ligament (PDL) were evaluated with intrusion and lingual root torque using finite element method (FEM).

Materials and methods: A three-dimensional (3D) FEM model of the maxillary incisors was generated using SOLIDWORKS modeling software. Stresses in the PDL were evaluated with intrusive and lingual root torque movements by a 3D FEM using ANSYS software using linear stress analysis.

Results: It was observed that with the application of intrusive load compressive stresses were distributed at the apex whereas tensile stress was seen at the cervical margin. With the application of lingual root torque maximum compressive stress was distributed at the apex and tensile stress was distributed throughout the PDL.

Conclusion: For intrusive and lingual root torque movements stress values over the PDL was within the range of optimal stress value as proposed by Lee, with a given force system by Proffit as optimum forces for orthodontic tooth movement using linear properties.

No MeSH data available.


(a) Geometric model of maxillary central incisor and supporting structures in SOLIDWORKS software, (b) model showing elements and nodes distribution (1,48,097 elements and 2,39,666 nodes).
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Figure 1: (a) Geometric model of maxillary central incisor and supporting structures in SOLIDWORKS software, (b) model showing elements and nodes distribution (1,48,097 elements and 2,39,666 nodes).

Mentions: The purpose of the geometric modeling phase is to represent a geometry in terms of points (grids), line surfaces (patches), and volume (hyper patches). In this study, the analytical model incorporating maxillary central incisor along with PDL, cortical and compact bone were developed according to dimensions and morphology found in a standard textbook of Dental Anatomy, Physiology, and Occlusion by Wheeler’s.6 PDL was simulated as a 0.2 mm thick ring around the model of the tooth and cortical bone at 0.5 mm thick (Figure 1a).7 With software SOLIDWORKS surfaces were generated and this data was exported in Initial Graphics Exchange Specification (IGES) format to ANSYS workbench.


Stress Induced in the Periodontal Ligament under Orthodontic Loading (Part I): A Finite Element Method Study Using Linear Analysis.

Hemanth M, Deoli S, Raghuveer HP, Rani MS, Hegde C, Vedavathi B - J Int Oral Health (2015)

(a) Geometric model of maxillary central incisor and supporting structures in SOLIDWORKS software, (b) model showing elements and nodes distribution (1,48,097 elements and 2,39,666 nodes).
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4588778&req=5

Figure 1: (a) Geometric model of maxillary central incisor and supporting structures in SOLIDWORKS software, (b) model showing elements and nodes distribution (1,48,097 elements and 2,39,666 nodes).
Mentions: The purpose of the geometric modeling phase is to represent a geometry in terms of points (grids), line surfaces (patches), and volume (hyper patches). In this study, the analytical model incorporating maxillary central incisor along with PDL, cortical and compact bone were developed according to dimensions and morphology found in a standard textbook of Dental Anatomy, Physiology, and Occlusion by Wheeler’s.6 PDL was simulated as a 0.2 mm thick ring around the model of the tooth and cortical bone at 0.5 mm thick (Figure 1a).7 With software SOLIDWORKS surfaces were generated and this data was exported in Initial Graphics Exchange Specification (IGES) format to ANSYS workbench.

Bottom Line: A three-dimensional (3D) FEM model of the maxillary incisors was generated using SOLIDWORKS modeling software.It was observed that with the application of intrusive load compressive stresses were distributed at the apex whereas tensile stress was seen at the cervical margin.With the application of lingual root torque maximum compressive stress was distributed at the apex and tensile stress was distributed throughout the PDL.

View Article: PubMed Central - PubMed

Affiliation: Professor and Head, Department of Orthodontics and Dentofacial Orthopedics, Dayananda Sagar College of Dental Sciences, Bengaluru, Karnataka, India.

ABSTRACT

Background: Orthodontic tooth movement is a complex procedure that occurs due to various biomechanical changes in the periodontium. Optimal orthodontic forces yield maximum tooth movement whereas if the forces fall beyond the optimal threshold it can cause deleterious effects. Among various types of tooth movements intrusion and lingual root torque are associated with causing root resoprtion, especially with the incisors. Therefore in this study, the stress patterns in the periodontal ligament (PDL) were evaluated with intrusion and lingual root torque using finite element method (FEM).

Materials and methods: A three-dimensional (3D) FEM model of the maxillary incisors was generated using SOLIDWORKS modeling software. Stresses in the PDL were evaluated with intrusive and lingual root torque movements by a 3D FEM using ANSYS software using linear stress analysis.

Results: It was observed that with the application of intrusive load compressive stresses were distributed at the apex whereas tensile stress was seen at the cervical margin. With the application of lingual root torque maximum compressive stress was distributed at the apex and tensile stress was distributed throughout the PDL.

Conclusion: For intrusive and lingual root torque movements stress values over the PDL was within the range of optimal stress value as proposed by Lee, with a given force system by Proffit as optimum forces for orthodontic tooth movement using linear properties.

No MeSH data available.