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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) Load application along the long axis of the tooth, (b) load application for lingual root torque.
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Figure 2: (a) Load application along the long axis of the tooth, (b) load application for lingual root torque.

Mentions: Application of forces in this study was the same as used previously by Puente et al. and Rudolph et al.10,11 They were also within the range of optimum forces for orthodontic tooth movement proposed by Proffit et al.1 Intrusion and lingual root torque were applied at various points of the crown surface. Intrusion was modeled by applying 20 g of force directed along the long axis of the tooth (Figure 2a). To obtain lingual root torque, it was necessary to apply a couple, to create a moment (the moment of a couple or Mc) equal in magnitude and opposite in direction to the original movement. Therefore, 15 N/mm of lingual root torque was applied (Figure 2b).


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) Load application along the long axis of the tooth, (b) load application for lingual root torque.
© Copyright Policy - open-access
Related In: Results  -  Collection

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

Figure 2: (a) Load application along the long axis of the tooth, (b) load application for lingual root torque.
Mentions: Application of forces in this study was the same as used previously by Puente et al. and Rudolph et al.10,11 They were also within the range of optimum forces for orthodontic tooth movement proposed by Proffit et al.1 Intrusion and lingual root torque were applied at various points of the crown surface. Intrusion was modeled by applying 20 g of force directed along the long axis of the tooth (Figure 2a). To obtain lingual root torque, it was necessary to apply a couple, to create a moment (the moment of a couple or Mc) equal in magnitude and opposite in direction to the original movement. Therefore, 15 N/mm of lingual root torque was applied (Figure 2b).

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.