论文部分内容阅读
人的一生,共有两副牙齿,即乳牙和恒牙,两者的替换一般从6岁开始。此时,乳前牙开始脱落,同时第一恒磨牙(六龄牙)萌出。之后,上下颌的乳牙逐渐为相应的恒牙所替换,一直到十二三岁左右,乳牙全部被恒牙代替。这段时间称之为换牙期。在这长达六七年的“新旧牙”替换期,应该如何做好牙齿的保健工作?第一种:新牙长出,旧牙不掉。乳牙滞留或早失是替牙期最常见的问题。换牙有一定的规律,简单来讲就是“一定时间,一定顺序,左右对称,先下后上”。但不少时候,恒牙已经萌出,而所替代的乳牙尚
A person’s life, a total of two teeth, that is, deciduous teeth and permanent teeth, the replacement of both generally start from 6 years old. At this point, the milk began to fall off anterior teeth, while the first permanent molars (six teeth) eruption. Afterward, the upper and lower jaws of the deciduous teeth gradually replaced by the corresponding permanent teeth, until the twelfth or thirties, deciduous teeth were all replaced by permanent teeth. This period of time called the replacement period. In this sixty-seven years old “old and new teeth ” replacement period, how to do dental health care work? The first: new teeth grow, old teeth can not afford to fall. Deciduous tooth retention or premature loss is the most common problem during tooth period. There are certain rules of changing teeth, simply speaking is “a certain time, a certain order, so symmetrical, first after the last”. However, very often, permanent teeth have erupted, while the replacement of deciduous teeth is still