Good Nikon Lens for Dental Use?

I want to get a Lens for my Nikon D80.
I'm going to use it for close up shots of the mouth / teeth.
I was thinking a Macro 60mm or 100mm.

Does anyone know what a Dentist would use?

Added (1). My budget is about $300 so the 105mm seems to be out in the $800 range.
I've found the 40mm for $200 and a 60mm for $279

Dentists used to use a Nikon 35 mm SLR with the 200mm f/5.6 Medical-Nikkor

http://www.mir.com.my/rb/photography/companies/nikon/nikkoresources/special/250medical.htm

Using a cropped sensor 80D, my guess is that the 105 mm f/2.8 mm macro lens would be the choice with the addition of the R1C1 flash system

http://www.kenrockwell.com/.../macro.htm