Initial Stress In The Periodontal Membrane Of Lower Incisor With Different Alveolar Bone Height By Vertical Intrusion: A 3-Dimensional Finite Element Analysis

Objective:To clarify the influence of different alveolar bone height on stress distribution in the periodontal membrane (PDM) when the lower incisor was intruded. This research analyses the stress distribution in the PDM by a 3-dimensional finite element method (FEM) when the lower incisor was loaded with intrusive force. It provides the clinical reference for the orthodontic treatment of the patients with varying loss of alveolar bone. Methods:1.To get the original data of the 3-dimentional form of mandibular lateral incisor by 16 stratum spiral CT scanning and the digital image transmission and transcription, and then to construct 3-dimentional finite element model of mandibular lateral incisor in normal height alveolar crest under the condition of Solidworks (Model 1:including tooth,PDM,spongy bone and cortical bone). The biological materials used in this model is assumed to be successional and isotropic. The thickness of PDM and cortical bone are assumed to be 0.25mm and 1.0mm respectively.2.To build other six 3-dimentional finite element models of mandibular lateral incisor in different alveolar bone height (model 2～7) respectively On the basis of...