Objective: To analyse the root canal curvature frequency, position, direction and degree of the maxillary first molars.
目的：分析上颌第一磨牙根管弯曲位置、方向及弯曲度。
These verbs are compared as they mean to change to the opposite position, direction, or course.
当这些动词都意为改变到相反的位置、方向或进程时，常把它们进行比较。
These verbs are compared as they mean to change to the opposite position, direction, or course.
当这些动词都意为改变到相反的位置、方向或进程时，常把它们进行比较。
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