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. 2017 Mar-Apr;14(2):117-124.
doi: 10.4103/1735-3327.205795.

Stress distribution in maxillary first molar periodontium using straight pull headgear with vertical and horizontal tubes: A finite element analysis

Masood Feizbakhsh  1 , Mahmoud Kadkhodaei  2 , Dana Zandian  1 , Zahra Hosseinpour  1
Affiliations

Stress distribution in maxillary first molar periodontium using straight pull headgear with vertical and horizontal tubes: A finite element analysis

Masood Feizbakhsh et al. Dent Res J (Isfahan). 2017 Mar-Apr.

Abstract

Background: One of the most effective ways for distal movement of molars to treat Class II malocclusion is using extraoral force through a headgear device. The purpose of this study was the comparison of stress distribution in maxillary first molar periodontium using straight pull headgear in vertical and horizontal tubes through finite element method.

Materials and methods: Based on the real geometry model, a basic model of the first molar and maxillary bone was obtained using three-dimensional imaging of the skull. After the geometric modeling of periodontium components through CATIA software and the definition of mechanical properties and element classification, a force of 150 g for each headgear was defined in ABAQUS software. Consequently, Von Mises and Principal stresses were evaluated. The statistical analysis was performed using T-paired and Wilcoxon nonparametric tests.

Results: Extension of areas with Von Mises and Principal stresses utilizing straight pull headgear with a vertical tube was not different from that of using a horizontal tube, but the numerical value of the Von Mises stress in the vertical tube was significantly reduced (P < 0/05). On the other hand, the difference of the principal stress between both tubes was not significant (P > 0/05).

Conclusion: Based on the results, when force applied to the straight pull headgear with a vertical tube, Von Mises stress was reduced significantly in comparison with the horizontal tube. Therefore, to correct the mesiolingual movement of the maxillary first molar, vertical headgear tube is recommended.

Keywords: Dental stress analyses; Finite element analysis; extraoral traction appliance; maxilla; molar.

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Conflict of interest statement

The authors of this manuscript declare that they have no conflicts of interest, real or perceived, financial or non-financial in this article.

Figures

Figure 1
Figure 1
(a) Maxillary first molar model, (b) metal band with horizontal tube model, (c) metal band with vertical tube model, (d) complex of tooth, bone, and band with horizontal tube.
Figure 2
Figure 2
(a) Meshing of tooth, bone, and band with horizontal tube complex, (b) force and fulcrum of tooth, bone, and horizontal tube.
Figure 3
Figure 3
The extension of Von Mises stress area by applying vertical tube: (a) Roots, (b) periodontal ligament, (c) lamina dura, (d) spongy bone, (e) cortical bone, (f) combination of lamina dura, spongy, and cortical bone.
Figure 4
Figure 4
The extension of Von Mises stress area by applying horizontal tube: (a) Roots, (b) periodontal ligament, (c) lamina dura, (d) spongy bone, (e) cortical bone, (f) combination of lamina dura, spongy, and cortical bone.
Figure 5
Figure 5
The extension of Principal stress area by applying vertical tube: (a) Roots, (b) periodontal ligament, (c) lamina dura, (d) spongy bone, (e) cortical bone, (f) combination of lamina dura, spongy, and cortical bone.
Figure 6
Figure 6
The extension of Principal stress area by applying vertical tube: (a) Roots, (b) periodontal ligament, (c) lamina dura, (d) spongy bone, (e) cortical bone, (f) combination of lamina dura, spongy, and cortical bone.
See this image and copyright information in PMC

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