[Study on the stress distribution of different superstructures for tooth-implant supported denture].
OBJECTIVE
To compare the stress distributions of fixed bridge, cement-retained telescopic prostheses and extracoronal precision attachment (CEKA attachment) when connect the implants to the natural teeth, in order to find a more suitable design for it.


METHODS
3-D finite element models of tooth-implant partial fixed dentures were constructed by using the ANSYS software. The partial fixed denture was supported by the second premolar and an implant (substitute the second molar). A total load of 200N was distributed to the three units of the denture in vertical and lateral (45 degree) directions.


RESULTS
Both of the cement-retained telescopic and the CEKA attachment made the stress of the osseous tissues surrounding the implant and the tooth declined obviously under the loads of the two directions. The stress of the cement-retained telescopic was lower under vertical load,the stress of Ceka attachment was lower under lateral load while it caused the stress of the natural tooth increasing slightly. The stress under the lateral load was higher than that under the vertical load.


CONCLUSIONS
Both of the cement-retained telescopic and the CEKA attachment can improve the stress distribution of tooth-implant support denture. The CEKA attachment is better under lateral loads.
Chen
Ye
Y
Department of Stomatology, Tongji Hospital of Tongji University, Shanghai 200065, China. leafchen92@sina.com
Han
Dong-wei
DW
Xu
Qi-hua
QH