Three dimensional stress analysis of periodontal ligament of mandibular premolar with alveolar bone loss
LIU Lin
LIU Na
GUO Jing
SUN Hai-yang
LI Hong-bo
Abstract：Objective:To establish three dimensional finite element analysis models based on tooth long axis, and to investigate the effects of alveolar bone loss on stress distribution of periodontal ligament of mandibular premolar.Methods:A sound extracted mandibular premolar was selected. Finite-analysis modeling procedures included micro-CT scanning, the digital tooth modeling, determining the long axis and the cemento-enamel junction, dividing the root into ten equal sections, and establishing the stress analysis model. The loading force was 100N, and the loading directions were either parallel, perpendicular, or 45 degrees to the tooth long axis. The values of maximum Von Mises stress were calculated.Results:Three dimensional finite element analysis models were established based on tooth long axis and the cemento-enamel junction. The values of maximum Von Mises stress increased along with the ratio of alveolar bone loss. When the forces were applied parallel to the long axis of the tooth,the maximum Von Mises stress of periodontal ligament in 50% alveolar bone loss is two times higher than normal teeth without bone loss. When the forces were applied perpendicular, or 45 degrees to the long axis of the tooth, the maximum Von Mises stress of periodontal ligament in 30% alveolar bone loss was two times higher than normal teeth without bone loss.Conclusion:For mandibular premolars, the alveolar bone loss up to 30% will cause damage to the periodontal tissues.
Keywords：mandibular premolarstooth long axisperiodontal ligamentthree dimensional finite element analysisalveolar bone loss
Publication Date：2015-01-01
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：5( 75-79 )