3-Dimensional Finite Element Analysis on Periodontal Stress Distribution of Impacted Teeth During Orthodontic Treatment
To analyze stress around the impacted tooth by constituting a 3-dimensional finite element model of impacted tooth. The 3-dimensional finite element model of the right upper canine palatally impacted tooth was constituted by CT scan, append periodontal ligament and alveolar bone model was used to constitute impacted model. Three forces were loaded to 3-dimensional finite element model and the periodontal stress of impacted tooth was calculated. When the direction of the force has angle with the central axis of the impacted tooth, if the angle is larger, the maximum stress is larger and the stress distribution is more concentrate, and this goes against the eruption of the impacted tooth. If the angle between the orientation of the traction and central axis of the impacted tooth is smaller, there are more advantages to the eruption of the impacted tooth. When the direction of the force is in line with the central axis, the maximum stress is smaller, and the stress distribution is more even, and this has advantage to the eruption of the impacted tooth. Therefore the angle should be properly selected in order to make sure of the eruption of the impacted tooth. When the angle is quite large, more anchorage is needed to withstand the large force.
Keywords3-Dimensional finite element Impacted tooth Periodontal stress analysis Orthodontic treatment
This study was funded by Shandong Provincial Science and Technology Development Project (2006GG2202031) and Dongying city Science and Technology Development Project (2006-24).
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