to Stargirl:
Ahh... Okay, I think it's clearer now what might be the problem.
You are cutting ivorine teeth on a typodont, correct?
Don't worry. Cutting Ivorine teeth is NOTHING like working on real teeth. Real teeth cuts LOTS more easily and the handpiece does not have a tendency to "run away" unlike ivorine. You also have to use much higher finger pressures on ivorine.
It will get better when you work on a real patient. You'll see!
Meanwhile, use new, sharp carbides, and use diamonds whenever possible-- Those cut through ivorine a bit more easily than carbides and leaves less burn marks to boot. It should go a ways in relieving your hand strain.
Definitely work on your positioning. The philosophy is that the patient is only in your chair for a few hours but you will be working for a lifetime, so having them stand a bit of discomfort by changing position for a few hours to suit you is much better than you playing contortionist all the time and ending up with a Quasimodo hunchback by the time you are 40.
My tip for getting enough study time despite all the preclinic labwork: Reserve one day of the week for catching up/finishing ALL the labwork for the week, rather than spending time in the lab every day doing piecemeal work. That way you put in one solid block of lab time, and will have solid blocks of time to do other things like study. Your mileage may vary, of course.
to SDN9876:
With the exception of the linguals of maxillary anteriors, I've actually been able to use direct vision when doing maxillary preps on live patients while my back remains upright and straight. It's all a matter of positioning! 😀
The trick to preventing hand fatigue with the intraoral mirror is to change the grasp as the situation demands it. The normal pen grasp will strain your hand if you are retracting cheeks with that grip-- Try a fingerwrap grip instead.
Luck!