It was clear that zygoma implants undertook more of the
stresses in Models 3 and 4 so that the burden of clasps and
abutments decreased evidently, and the stress distribution with
two implants was more balanced compared with that with one
implant. Moreover, the distal implant shared more stresses in
Model 4 under lateral loading. There was just a stress concentra-
tion, aslarge as 14 N and 25 N of the two models respectively,in
the implant-superstructure joint region(Fig. 8).