hey i believe showing an interest in the following may help:
playing a musical instrument- e.g. violin.
a hobby- for example Nitro R/C cars and Engine building-
by analogy the engine is similar to a patients mouth in the sense that changing the air/ fuel ratio mixture may cause severe damage to the piston and overheating of the engine head. likewise, too much NO2 and 02 or local anaesthetic may knock the patient out or cause brain damage!
Precision skills- as the OP suggested, soldering on circuit boards, computer building (lool at the other guy who suggested this, coincidentally, i used 2 work for maplin!)- this may give you the upper hand in close technical procedures in dentistry for example root canal treatment! very high risk of faliure!!!!! you may go beyond the apex of the tooth and make the patient weep like a baby!
And finally, the ability to concentrate for hours and hours- even computer consoles games can assist this!
so, if you are stumped of ideas, just think what qualities a brain surgeon might have- its pretty much similar.
i hope that helps!