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材料和方法 选择符合下列条件的30颗下颌磨牙的60个近中根管:(a)根管从根管口到根尖孔无分叉,(b)在近远中平面上根管的曲率在15°～31°之间,(c)距(牙合)方参照点根管长度超过15mm。在距根尖孔2.0mm处环绕牙根面划一条线,从根管开始偏离长轴点处向根尖方1.0mm划另一条线。根尖孔处滴上石蜡,把标本固定在树脂中,在两处划线的冠方0.5mm处垂直牙根表面切割树脂块。将树脂块拍摄成像,数字减影处理,贮存在光盘中,然后将树脂块复位,按根管
Materials and Methods Sixty proximal mesial tubules of 30 mandibular molar were selected: (a) the root canal had no bifurcation from the root orifice to the apical foramen, (b) the curvature of the root canal in the mesial and distal planes Between 15 ° ~ 31 °, (c) from the occlusal point of reference root canal length of more than 15mm. In the apical foramen 2.0mm around the root surface of a line drawn from the root canal away from the point of the long axis to the apical 1.0mm draw another line. The apical foramen was dropped with paraffin, the specimen was fixed in the resin, and the resin block was cut at a vertical root surface of 0.5 mm at the two crossed lines. The resin block shooting imaging, digital subtraction processing, stored in the disc, and then reset the resin block, press the root canal