the Blenderartist wissammax was so kind to give me a testfile, from his great teeth renderings,for testing.
i have found some papers about dental optical propeties, and i have put some of the values from it ,into the testfile shader.
values taken from are
IOR for enamel and dentin
SSS coefficent for dentin and enamel
from another teeth paper SSS settings for the gum
settings for the transparent/translucent enamel
at first i have scaled the model to real values, to match the SSS distance values.
chanced camera focus to 105mm, a value i have found for dentalphotografic.
thread from wissammax are here