The Research On The Application Of Finite Element Method And Modeling Of The Rigid Fixed Bridge In Deletion Of6in Mandibular

Objective: Constructing three-dimensional(3-D)model of denture and applying thismodel in mechanics to study the stress distribution of rigid fixed bridge in deletion of6inmandibular. Methods: Two-dimensional images of maxillary and Mandibular teeth andsupporting tissue of healthy people were scanned by CT.We designed the buccolingualdiameter of pontic at100%90%66.7%50%of the normal separately and90%66.7%50%of the normal separately and the second right mandibular molar, and then exerted thestress on the models, analysed the stress contribution on for the alveolar bone hight of theabutment and size of pontic. Results：The concentrated stress on the second premolarsignificantly when the buccolingual diameter of pontic at66.7%and50%of the normal.The concentrated stress on the second premolar and the second mandibular molarsignificantly and when the decrease of alveolar bone’s height of the second mandibularmolar than or equal to35%. Conclusion: The Maximum stress on the fixed bridge isfocus on surface of the connector. It may cause damage to the second premolar when thebuccolingual diameter of pontic less than66.7%of the normal. It may also cause damageto both of the abutments when the decrease of alveolar bone’s height of the secondmandibular molar than or equal to35%.