Permanent teeth of children has been the eruption of deciduous teeth did not fall off, or when the eruption of permanent teeth fails to deciduous teeth are retained in the permanent dentition is deciduous. The deciduous reason can be divided into three:
1. Direction of abnormal eruption of permanent teeth, the root of the deciduous teeth can not be completely absorbed. Common in the early mixed dentition mandibular central incisors, eruption of permanent teeth since the tongue side of the deciduous teeth in the labial dental instruments and first and second milk molar root and residual crown stranded in the first molar buccal and lingual or distal gap. The removal of such cases may be retention of deciduous teeth.
2. Congenitally missing permanent teeth, the deciduous root can not absorb and retention. Such can be accessed via the X-rays to determine whether the permanent teeth, in the absence of permanent teeth, retained deciduous teeth play a chewing function, but can not be retained for life.
3. Deciduous teeth under the permanent teeth, but the eruption of permanent teeth and weak, the primary teeth will not be absorbed and retention, X-rays to determine the permanent teeth after retention of primary teeth extracted, the observation of permanent teeth is The front teeth opening and closing of Knowledge Lecture natural eruption, within six months can not erupt normally can cut the gums to help Meng.
Deciduous teeth, it may cause eruption of permanent teeth difficult, and even the dentition, so there are stranded, it is recommended as soon as possible treatment, so as not to delay the best time.
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