根尖に適合するファイルサイズの決定

抄録

Abstract : The purpose of this study was to evaluate the decision of the first file size that fits the apical portion (FFFA). One hundred and thirteen extracted intact human mandibular premolars with single canals were used. The reason for extraction and age of the patients were unknown. After coronal flaring, FFFA was decided with the stepback technique (n=55, group 1) or crown-down technique (n=58, group 2). The mean size of FFFA was 0.25 mm and 0.29 mm for group 1 and group 2, respectively. The stepback technique showed a significantly smaller FFFA size than the crown-down technique.