Chronic, systemic, inflammatory arthritis leading to calcification and fusion of the joints is called:

The first heart sound (S1 ) is associated with closure of which heart valves?

A) Mitral and aortic B) Tricuspid and mitral C) Tricuspid and pulmonic D) Aortic and pulmonic

Gates-Glidden drills are used ____________

a. by hand b. in the high-speed handpiece c. in the low-speed handpiece d. not in endodontics