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第一恒磨牙是恒牙中萌出最早、担负咀嚼功能较大、对牙颌系统发育有着很大影响的牙齿,因此,一般情况下应当尽量保留,不宜轻易拔除。但在儿童时期,如果该牙严重损坏以致无法保留时,临床上可将第一恒磨牙在9岁左右,根据第二恒磨牙牙胚发育情况,掌握时机及早拔除,待第二磨牙生理性的近中移位至第一恒磨牙的位置萌出,以代替第一恒磨牙。笔者观察2例,报告如下:
The first permanent molars are the earliest permanent teeth, responsible for chewing larger teeth on the dental system has a great impact on the development of teeth, therefore, under normal circumstances should be retained as far as possible, should not be easily removed. However, in childhood, if the tooth is severely damaged and can not be preserved, the first permanent molars can be clinically 9 years old or so, according to the second permanent molars tooth germ development, grasp the opportunity to remove as soon as possible, to be second molars physiological Near the shift to the first permanent molars position eruption, instead of the first permanent molars. The author observed 2 cases, the report is as follows: