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材料扣方法 制作可纵分式牙模型,将报管扩至25~#并让1～2~#Machtou根管充压器只能进入距根尖狭窄5mm处,备好的根管也只允许中小号非标准牙胶尖到达距根尖0.5～1.0mm处。凭视觉和触觉定下主尖的位置,将牙胶尖充填至根尖冠方0.5 mm处(定为第1组),第2组主牙胶尖充填至距根尖1mm处。第2个术者分开牙齿照下主尖的位置并放大10倍,测量牙胶尖尖端至根尖的距离(d_1),如牙胶尖超过根尖孔则d_1为负,反之为正。垂直加压充填后摄第二次照片测量根尖与牙胶尖尖端间距离(d_2)。d_2-d_1的值表明了牙胶尖移动的距离,该值如为负则主尖在加压过程中
Material deduction method can be made of longitudinal tooth model, will be reported to expand to 25 ~ # and let 1 ~ 2 ~ # Machtou root canal pressure regulators can only enter 5mm from the apical stenosis, the prepared root canal only allows Small and medium sized non-standard gutta-percha point reached 0.5 ~ 1.0mm away from the root tip. Determine the location of the main tip by visual and tactile method. The gutta percha crest was filled to 0.5 mm at the apical crest (defined as group 1). The main gutta percha of Group 2 was filled 1 mm away from the root tip. The second surgeon separated the teeth according to the position of the main tip and magnified 10 times. The distance between the tip of the dentin and the root tip was measured (d_1). If the gutta percha is more than the apical foramen, d_1 is negative, and vice versa. The second photo was taken after vertical pressure filling. The distance between root tip and gutta tip was measured (d_2). The value of d_2-d_1 indicates the distance traveled by the gutta-percha point. If the value is negative, the main tip will be pressed