What are small area variations?

If 450 gm of ointment contains 10 gm of active ingredient, the percentage strength of the product is:

A) 22%. B) 0.22%. C) 2.2%. D) 0.022%.

Before trimming plaster models, dry models should be soaked in water for ____________

a. 2 minutes b. 5 minutes c. 10 minutes d. 24 hours