uh...kinda depends on what you want in a dental unit. When we were installing a new dental clinic at our school, we defined a complete dental unit as having
2 walls of cabinetry acting as dividers
a dental chair and all attached air powered cords
1/2 of a digital radiology unit (1 full unit shared between 2 operatories)
1 CPU and Monitor unit
We did not include things like the assistant or dentist's chairs, rolling cabinet, or any items that would sit on top of the cabinetry. Obviously things like plumbing or general construction costs were also left out.
We went with a pretty basic Adec Set up that ran about $45,000 per unit if I recall correctly, but the added costs of a sterilization room, a panoramic machine, and other general equipment really skyrocketed the total price.
Sorry, I can't help much more. I do forget the actual names of the different units...it was a mix and match of a lot of stuff.