Are you currently a physician or medical student?
Well, I don't know about skipping a year, but Columbia University College of Dental Medicine grants credit for medical school courses.
See this page for physicians and medical students by the College of Dental Medicine:
http://dental.columbia.edu/education/physicians_meds.htm
Also, many dental schools are willing to award credit for past courses taken in other programs (i.e., graduate, medical, etc.). Contact individual schools.
If you are not a physician or medical student, you may be interested in these opportunities.
The combined program offered by the Case Western Reserve University School of Medicine and School of Dental Medicine:
http://dental.case.edu/dmdmd/
Some schools allow you to pursue a double degree by special arrangement:
University of Connecticut School of Dental Medicine
http://sdm.uchc.edu/predoctoral/combineddegree/index.shtml