TY - JOUR AN - 12 AU - Zelada,G. AU - Varela,P. AU - Martin,B. TI - The effect of rotational speed and the curvature of root canals on the breakage of rotary endodontic instruments. JO - J Endod PY - 2002 VL - 28 SP - 540-542 M2 - 540 ER -