Chinese Journal of Tissue Engineering Research ›› 2014, Vol. 18 ›› Issue (24): 3845-3849.doi: 10.3969/j.issn.2095-4344.2014.24.013

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Maxillary first molar displacement and stress analysis of transmission straight wire technique under gable bend effect

Ding Rui1, 2, Bai Xin-hua2, Man Yun-na2, Wu Pei-ling1, Wang Wei3   

  1. 1Department of Stomatology, Second Affiliated Hospital of Xinjiang Medical University, Urumqi 830063, Xinjiang Uygur Autonomous Region, China
    2Urumqi Stomatological Hospital, Urumqi 830002, Xinjiang Uygur Autonomous Region, China
    3CAD/CAM Laboratory, Xinjiang University, Urumqi 830046, Xinjiang Uygur Autonomous Region, China
  • Revised:2014-05-17 Online:2014-06-11 Published:2014-06-11
  • Contact: Wu Pei-ling, M.D., Chief physician, Doctoral supervisor, Department of Stomatology, Second Affiliated Hospital of Xinjiang Medical University, Urumqi 830063, Xinjiang Uygur Autonomous Region, China
  • About author:Ding Rui, Attending physician, Department of Stomatology, Second Affiliated Hospital of Xinjiang Medical University, Urumqi 830063, Xinjiang Uygur Autonomous Region, China; Urumqi Stomatological Hospital, Urumqi 830002, Xinjiang Uygur Autonomous Region, China
  • Supported by:

    a grant from Urumqi Municipal Science and Technology Bureau, No. Y101310007

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Abstract:

BACKGROUND: With the development of modern orthodontics techniques, designing an efficient appliance is the focus in recent studies. Transmission straight wire appliance was invented under this background. This appliance can accelerate teeth leveling, shorten treatment duration, improve correction efficacy, and provide a novel approach to solve intractable cases. The relationship between maxillary first molar displacement and stress distribution needs further study.
OBJECTIVE: To establish three-dimensional finite element model with better biological and mechanical similarity of transmission straight wire appliance, and obtain the relationship between maxillary first molar displacement and stress distribution.
METHODS: By using 64-row spiral CT scanning, the sectional image data in DICOM of TMJ, maxilla and upper tooth were acquired from a volunteer with Angle Class II division 1. With the help of Mimics 10.01, Geomagic Studio 8.0, Unigraphics NX 6.0 and Ansys workbench 13.0 softwares, the three-dimensional finite element model of transmission straight wire appliance, bend, Australian Orthodontic Wire, including maxilla, upper tooth, periodontal ligament, arch wire and brackets was established in Windows XP Service Pack 3 system. The model was loading, to obtain the maxillary first molar displacement and stress distribution.
RESULTS AND CONCLUSION: A three-dimensional finite element model of transmission straight wire appliance was established, which consisted of 250 929 elements and 657 766 nodes. Furthermore, the stress distribution of maxillary first molar tilt displacement trend curve under the action of maxillary first molar region was observed, which favors to analyze transmission straight wire appliance mechanical system and guide the clinical application and appliance improvements. Our findings indicate that, under the tilt bending, dental root will be close to the buccal cortical bone, leading to stress concentration at the root tip and maxillary buccal cortical areas; this stress concentration may lead to root resorption of the maxillary first molar.



中国组织工程研究杂志出版内容重点：组织构建；骨细胞；软骨细胞；细胞培养；成纤维细胞；血管内皮细胞；骨质疏松；组织工程


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Key words: finite element analysis, molar, maxilla, tooth root

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