Working with light weight, I have been trying to improve my wrist strength for the field of dentistry. For the three above, 3-4 sets for 6-8 reps (making sure to pause for about 3 seconds, on the second picture, between each rep).
Furthermore, my two ideal exercises to develop stronger forearms are reverse curls and hammer curls (3-4 sets 12 reps).
Lastly, you need a strong back for dentistry. Proper posture is due to the erector spinae muscles (learned that in anatomy this Fall semester!). For upper back, I have been enjoying rope-cable face pulls, chin-ups, and pull-ups. My go-to exercise to target lower back is back extensions (making sure your back is straight). More importantly, developing a strong abdominal core is vital for back health. Before any training session, I warm up for 15-20min on the treadmill and I spend 10-15 minutes working on my rectus abdominis and external obliques.