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Secondary roots emerge on the 4th or 5th day about 4 or 5 cm from the root apex. 在第四或第五天，距根端大约4或5厘米处发出次生根。
The dead load shear and impact shear testing were performed from both of root apex direction and cutting edge direction. 测试了剪切力分别沿根尖方向和切缘方向作用的静剪切和冲击剪切强度。
Methods We used the root apex locator to measure work length of each root canal of 36 cases and compared the measured results. 方法用根尖定位仪测量36例患牙的每个根管工作长度，并进行比较。