ysonmex...thanks for your entries! I really like #156. It's very simple and I like the colors and fonts. However, I've seen that image in the sphere (a lotus flower?) so many times that I don't know if it will set them apart from many other logos. Personally, I think it works well in this case, but I'm interested in seeing new shapes inside the sphere.
Also, the dentists told us specifically not to show them anything with their initials in it. That's what they have now and they don't want to completely re-brand themselves every time a new dentist joins or leaves the practice.
Lastly...what type of flower is being used in #146?