Initial Stress In The Periodontal Membrane Of Maxillary First Molar With Different Alveolar Bone Height By Intrusion: A 3-dimensional Finite Element Analysis

Objectives: To establish the 3-D finite element models of maxillary first molar with normal alveolar bone height, horizontal balanced bone loss and horizontal unbalanced bone loss, respectively, calculating the stress magnitude and distribution within the PDL of maxillary first molar when loaded with intrusion force for the purpose of providing reference for the orthodontic treatment of patients with periodontal problem.Methods: Get the 3-D morphologic date of the upper first molar by CT scanning, then construct the three-dimensional finite element model of maxillary first molar and its periodontal tissue with normal alveolar bone height by Solidwork which was distinguished the tissues of the tooth, PDL, cancellous bone and cortical bone. This model was named model â… . After that, remove 2.0 mm, 3.5 mm, 6.0 mm height of alveolar bone horizontally from the alveolar crest, created model â…¡, â…¢, â…£ to simulating horizontal balanced bone loss sequentially, remove 2.0 mm height of alveolar bone lingually formed the model â…¤, remove 3.5 mm height alveolar bone lingually while remove 2.0 mm height alveolar bone buccally formed model â…£ ; remove 6.0 mm height alveolar bone lingually while remove 3.5 mm height alveolar bone buccally formed model â…¦ , simulating the horizontal unbalanced bone resorption model sequentially. Then these CAD concrete models referred above were imported into ALGOR software, FEA concrete element can be produced automatically. The concerning material parameters and hypothesis...