[The three-dimensional analysis of mandibular overdenture supported by implants].
In recent decade, the treatment in which two or four implants are placed in an edentulous patient to support an overdenture has been more effective and safe, and the retention and stability of overdenture have been improved by the use of attachments fabricated on implant abutments. This study aimed to investigate the supporting tissue stress distributions of implant-overdenture with a 3-D finite element model built by CT scan and CAD technology when various attachments and loads were used respectively. The results demonstrated that the establishment of the three-dimensional finite element model with CT scan and CAD technique had saved time and effort, and it did not damage the experiment model. The tissue structure was quite distinct in imaging. In terms of the stress distribution of bone tissue in the overdenture supported by implant, there was a difference between bar attachment and stud attachment. However, such a difference was minor as compared with the difference caused by the bite force direction. The stress value of cortical bone around abutment with 20 degree oblique force was 2.2-3 times that with vertical force. Therefore, to reduce high stress peaks, attention must be paid to the direction of the bite force, as this variable is much more important than the design of superstructure.
Luo
X
X
Department of Prosthodontics, College of Stomatology, Fourth Military Medical University, Xi'an 710032.
Ouyang
G
G
Ma
X
X
Jia
A
A
Guo
T
T
D000368:Aged; D003758:Dental Implantation, Endosseous; D003799:Dental Stress Analysis / Q000379:methods*; D003781:Denture Retention; D003826:Denture, Complete, Lower; D003936:Diagnosis, Computer-Assisted; D005260:Female; D020342:Finite Element Analysis; D006801:Humans