Concerning bone support there is a difference in static beha-
vior between a cylindrical and threaded implant, which affects
the interfacial shear strength. This will be discussed with refer-
ence to Fig. 7. On the very top of the thread, the same effect on
interfacial shear strength as for a cylindrical implant can be
expected. On the very bottom of the thread there is an additional
effect, represented by the thread depth, increasing the bone
support and thereby increasing the interfacial shear strength.
On the thread flanks the resistance to gap formation exerted
by the bone is greater, which will increase the interfacial shear
strength. The opposite thread flank will further increase this