3-D Finite Element Analysis Of Peridental Stress Distribution When Impacted Teeth Are Tracted

[Objective] Impacted tooth is frequent disease of oral section.Impacted tooth frequently appears in upper cuspid and upper central incisors(except of the third molar) .The impacted tooth have a large effect on function of the dentofacial anomaly and aesthetic.The study in existence about the impacted tooth mostly focus on complication due to impacted tooth,orientation of impacted tooth and the treatment.But biomechanical mechanism on traction of impacted tooth is not clear.The study about the best force and the best orientation that the impacted tooth is tracted in is in the phase of experiential medicene It reduces controlling to tooth motion,delays the treatment time and increases the treatment difficulty.The objeative of this research is analyzing stress around the impacted tooth,by constituting a 3-d finite element model of impacted tooth,consequently offering reference basis for clinic traction treatment.[Method] Have a CT scaning to selected model,and transform obtainedimage data of impacted tooth to CT image.Then build right-angle coordinate on tracing paper, trace out the figure curve of impacted tooth and number the figure paper.The 3-D right-angle coordinate is built,and select node from figure of every section.Imput the coordinate number of node to the compute. Using Ansys ,,The substantiality model is constituted.Then transmit the substantiality model to great limited element analysis soft ANSYS by USA ANSYS company,and constitute the 3-D limited element model of the impacted tooth. Then append periodentium and alveolar bone model to constituted impacted model. Load 3 force to 3-d finite element model ,and calculate peridotal stress of impacted tooth.