下颌骨骨折的愈合情况仅靠X 线片尚不能客观地评价,而生物电位却能真实地反映软硬组织的变化情况。材料和方法:利用高度准确性的小型电测仪,绝对误差不超过±0.5mv。采用无极化性的氯化银电极,一个电极固定在口前庭移行皱襞的中点,另一个电极测量口腔粘膜各个部位的生物电位。先从20例18～20岁的健康人测出口腔各部位生物电位的标准值。 The healing of mandibular fractures can not be objectively evaluated by X-ray alone, but the biopotential can truly reflect the changes of soft and hard tissues. Materials and methods: The use of a high degree of accuracy of small electrical measuring instrument, the absolute error of not more than ± 0.5mv. The use of non-polar silver chloride electrode, one electrode fixed in the vestibule of the midpoint of folds, the other electrode to measure the various parts of the oral mucosa of the biological potential. First of all 20 healthy subjects aged 18 to 20 years to determine the oral bioelectric potential of various parts of the standard value.