Most canned scheduling programs for dentistry have the capability of selecting either 10-or 15-minute intervals. Any possibility, with a little bit of programming, to accomplish the same?

Sure. Check out the second post here: http://www.seedcode.com/support/viewtop ... =3271#3271

This is something we offer as a two hour modification to our calendar, and we could have it open to a 10 minute interval by default. Let me know if that's interesting to you (john at seedcode.com)