[Three dimensional finite element stress analysis in various class II cavity design on first maxillary premolar].
OBJECTIVE
To evaluate the stress influence in different contour of class II cavity with different filling materials on first maxillary premolar.


METHODS
The stress distribution in two types and all three contours of class II cavity in maxillary premolar were analyzed by three dimensional finite element. The cavity was respectively filled with amalgam and composite resin; and the vertical and lateral stress force was calculated.


RESULTS
In the different contours, the stress of composite restoration by slot design was close to that by dovetail design, and the stress of amalgam restoration by slot design, especially in vertical force, descended respectively at 41%,29% and 27%.


CONCLUSIONS
When class II lesions is only limited in proximal region of the premolar, the filling of composite resin with slot design is recommended.
Sun
Zhe
Z
Department of Oral Medicine, Ninth People's Hospital, School of Stomatology, Shanghai Second Medical University, Shanghai 200011, China.
Xu
Xiao
X
Tao
Lan
L
Xiong
Huan-guo
HG