The majority of the "alternate careers in dentistry" explored by the 5% of dentists not in private practice require a lesser degree of manual dexterity... insurance adjustor...the aforementioned public health, radiology and oral pathology...non-clinical dental school professor.... my personal favorite: oral anatomy guru - learn the lingo, write a textbook and you're golden!
seriously though, anyone with D.D.S. after their name has or had a serious amount of manual dexterity and bag of skills to make it through school and boards.
Yah-E - glad you mentioned research requiring manual skills - it was pretty embarassing this summer when my advisor was looking at my ELISA data and commented: this looks like it was pipetted by gerbils!!!