TY - RPRT TI - Effectiveness of four methods for preparing root canals: a scanning electron microscopic evaluation. AU - Y Haikel AU - C Allemann PY - 1988 DO - 10.1016/s0099-2399(88)80195-x UR - https://pubmed.ncbi.nlm.nih.gov/3251995/ ID - 3251995 ER -