Delayed tooth eruption

Introduction The newborn has no teeth, and the deciduous teeth begin to erupt 4 to 10 months after birth. The late ones can reach 10~12 months. After 12 months, the teeth are delayed. The cause of late deciduous teeth is more, first of all, whether the young children should be excluded Systemic diseases affect the eruption of teeth and promptly treat related diseases.

Cause

Generally speaking, the morning and evening of a child's teething is mainly determined by innate factors.

(1) Rickets: The late germination rate of deciduous teeth of children with rickets is higher than that of normal children. Vitamin D treatment of vitamin D deficiency rickets can promote the eruption of deciduous teeth, indicating that late deciduous teeth are associated with rickets.

(2) stagnation: congenital thyroid hypoplasia or dysfunction causes developmental disorders in children, causing deciduous teeth to erupt too late.

(3) serious lack of nutrition: the lack of some trace elements, such as calcium, zinc, etc., can also cause the deciduous teeth to be late. The cause should be identified and treated promptly.

an examination

Related inspection

Child growth and development test

The early and late eruption of teeth is not an important indicator to measure the baby's growth and development. Generally speaking, the morning and evening of a child's teething is mainly determined by innate factors. Some children can start teething at 4 months, and some children have just erupted their first deciduous teeth in 10 months. Even after 10 months, the deciduous teeth are still not erupted and need not be nervous. As long as the body has no other diseases, it is not very important to postpone the first deciduous teeth until the age of one year.

Differential diagnosis

Teething is a physiological phenomenon. Some children have temporary drooling, restless sleep, low fever, diarrhea and love to bite the nipple. The deciduous teeth are late, the tooth quality is poor; the disorder of the teeth is seen in diseases such as stagnation, congenital, nutritional disorders, rickets and bone dysplasia.

Early eruption: It means that the eruption time of the teeth is ahead of the normal eruption time, and the root development is less than 1/3 of the root length.

Erupted at birth or shortly after birth (more common in mandibular incisors), long teeth with hypoplasia or even no heel, often can fall off on their own; individual permanent teeth, may be caused by early deciduous teeth, may be erupted premature eruption Difficulties: usually the first deciduous teeth are erupted one year after birth, still normal. Individual deciduous teeth are late, may be related to trauma or infection; permanent teeth are late or ectopic, often due to deciduous teeth retention, occupying permanent teeth or deciduous teeth Premature detachment causes displacement of adjacent teeth, resulting in insufficient voids; permanent teeth (maxillary incisors) erupted, often due to premature deciduous deciduous teeth, local enamel tough hypertrophy, may be erupted too late, ectopic, eruption difficulties. Ectopic eruption: Any permanent tooth that erupts in the normal position of the dentition during eruption, is called ectopic eruption.

Common in clinical practice: maxillary first permanent molar and maxillary canine, followed by mandibular lateral incisors and first permanent molars.

1, the first permanent molar ectopic eruption: the early diagnosis of the first permanent molar ectopic eruption can be found in the X-ray film around 6 years old. In the far middle root of the second deciduous tooth close to the tooth neck position, the root surface has a curved absorption Before and after the age of 7 years, in addition to the performance on the X-ray film, it is often seen that the distal edge of the first permanent molar is erupted, while the proximal margin is blocked under the distal middle of the second molar, the crown tilt.

2, permanent fangs ectopic eruption: the common is the maxillary canine's labial dislocation eruption. Sometimes clinically visible: canine and the first bicuspid or mandibular lateral incisor and canine translocation, clinically known as translocation eruption. When the permanent incisor is lost prematurely or the root of the permanent incisor is short, the maxillary canine can also be displaced to the position of the central incisor or across the jaw. The early and late eruption of the tooth is not a measure of the baby. An important indicator of growth and development. Generally speaking, the morning and evening of a child's teething is mainly determined by innate factors. Some children can start teething at 4 months, and some children have just erupted their first deciduous teeth in 10 months. Even after 10 months, the deciduous teeth are still not erupted and need not be nervous. As long as the body has no other diseases, it is not very important to postpone the first deciduous teeth until the age of one year.

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