Three Dimensional Finite Element Analysis of the Stress Distribution of Dental Implants with Immediate Loading

Objective:To analyze the stress distribution of bone around the dental implants with immediate loading with the method of three-dimensional finite element.Methods:Three-dimensional finite element model of thread dental implants with immediate loading was developed using CT scanning and USIS(Universal Surgical Integration System)software developed by ourselves.The value of Von Mises stress 、strain of implant-bone interface were calculated with the software of ANSYS,when the dental implants were loaded with vertical、 buccolingual and mesiodistal force of 150 N.Results:When the dental implants were loaded with vertical force,the Von Mises stress concentration appeared around the lingual cortical bone intergrated with the neck of implants,and Von Mises strain were well-distributed,.When the dental implants were loaded with buccolingual force,the Von Mises stress and strain concentration all appeared around the lingual cortical bone intergrated with the neck of implants,but the maximum value of Von Mises stress increased by 315%,the maximum value of strain increased by 298%,and the strain distribution weren' even.When the dental implants were loaded with mesiodistal force,the Von Mises stress concentration appeared around the distall cortical bone intergrated with the neck of implants,the maximum value of Von Mises stress increased by 272%,and Von Mises strain concentrated on on the mesial cancellous bone intergrated with the bottom of implants,the maximum value of Von Mises strain increased by 51%.Conclusion:Von Mises stress and strain didn't concentrated obviously and the distribution of them were even,when dental implants were loaded with immediate vertical force.However,when dental implants were loaded with immediate oblique force,the value of Von Mises stress and strain increased apparently and the distribution of them were quite uneven.