First of all sorry for the bad english!

is there a way to influence the net(tesselation?) of a subd-object.
i've tried the standard functions but the result isnt satisfying at all. it looks like the example in the teeth-thread.

I`m modeling a head using subd. but the subdfaces aren't perfect quadpolys. also extruding the proxymesh produces a quiete unusual behavior of the subd-object.
what confuses me is that most professionell subd-structures consists of a perfect quadmesh. how can i achieve this. i guess they convert the subd-mesh into polys but this way i loose all of the advantages of subd.