This page from the Academy of General Dentistry(AGD) gives concise definitions of a few dental terms. Not comprehensive by any stretch of the imagination, but decent starting point.
Hans Skariah, B.Sc., DMD
Promenade Court Dental Health Group in Mississauga
2233 Hurontario St., Mississauga, ON, Canada
(1/2 km north of the QEW in the Dome Building)