Spot-welded matrix bands are custom-made bands used for Class _____ restorations

Although underground buildings pose several problems for firefighters, the greatest challenge in controlling fires is probably:

A) access to the structure. B) rescue and evacuation. C) ventilation of heat and smoke. D) water supply and drainage.

Which of the following antibiotics was the first discovered?

a. erythromycin b. penicillin c. tetracycline d. clindamycin