1, bad oral habits
(1) Bad breast-feeding posture, such as improper bottle feeding, requires the lower jaw to suck forward, which may cause the front teeth to bite back.
(2) There is a bad habit of biting the upper lip or mandibular protrusion, which leads to anterior teeth inversion and mandibular protrusion.
2. Local disorder in mixed dentition.
(1) Retention or premature loss of deciduous teeth may lead to malocclusion of individual anterior teeth or malocclusion of multiple anterior teeth.
(2) Maxillary deciduous molars fall off prematurely, and maxillary permanent anterior teeth move backward, which can form anterior crossbite.
(3) Underwear of deciduous teeth is higher than the plane of dental arch. In order to avoid the possible premature contact between the upper and lower deciduous teeth, the mandible will move forward or sideways, forming mandibular protrusion, resulting in anterior crossbite or anterior crossbite.
(4) Congenital absence of upper permanent incisors, such as common maxillary lateral incisors, can lead to hypoplasia of the anterior maxilla and form anterior crossbite.
3. Disease
(1) Chronic inflammation of palatal tonsil or lingual tonsil stimulates mandibular protrusion, which may lead to anterior crossbite with mandibular protrusion over time.
(2) Patients with cleft lip and palate often suffer from maxillary hypoplasia, which easily leads to anterior crossbite, mesial malocclusion and mandibular protrusion.
(3) Patients with rickets, whose calcium and phosphorus metabolism are disordered and their facial and maxillofacial muscles are abnormal, often lead to more serious mandibular protrusion or anterior teeth bite deformity.
(4) Endocrine diseases, such as hyperfunction of anterior pituitary, can cause mandibular protrusion deformity.
4. heredity
There is an obvious family history, and the mandibular and facial deformities are remarkable.
Second, how to treat children's teeth?
In medicine, the principle of correction is to eliminate the cause as soon as possible and correct it as soon as possible, which can obtain good correction effect and prevent the serious development of deformity. Children's individual teeth can be handled by their parents under the guidance of doctors. When multiple dentures or deformities are serious, dentists need to use special appliances to correct them. Many front teeth can be corrected by dentists to restore normal mandibular occlusal function and facial beauty.
The deciduous teeth are slightly swollen and cannot be corrected for the time being. When deciduous teeth fall off to replace permanent teeth, some edema deformities can be corrected by themselves. However, deciduous teeth are serious and obvious, and it is best to treat them at the age of 4.
During the period of tooth replacement and early permanent teeth, the maxillofacial region grows vigorously. If malocclusion is corrected in time, it can get twice the result with half the effort and block the abnormal growth and development of jaw in time, which is the key period to correct puffiness. The average age is 8- 12 years old. Otherwise, only through orthodontic treatment or orthognathic surgery can we achieve good results.
There are three treatment opportunities for children who brush their teeth:
The first stage: occlusal period of deciduous teeth.
The best orthodontic age at this stage is about four years old. At this time, the child's permanent teeth have not erupted, and the roots of deciduous teeth have not been absorbed. They can be corrected by wearing removable appliances in the mouth, and the course of treatment is about six months. Early treatment at this stage is of great benefit to the normal growth and development of children's maxillofacial region.
The second stage: occlusal period of mixed teeth.
After the upper and lower four front teeth are replaced, the child can continue to correct when he is about eight or nine years old. According to the severity of deformity in children, movable appliance, fixed appliance and even external plastic force can be used to correct teeth. If treated in time, it will be of great help to children's face improvement and growth and development.
The third stage: occlusal period of permanent teeth.
It is the peak of growth and development when all the baby teeth are replaced. Children who are still brushing their teeth at this time can continue their treatment. Because the growth of children's mandible is basically synchronous with the growth of their height, it is still necessary to observe the end of the peak period of children's growth and development after orthodontic treatment is completed.
It should be noted that large hospitals and experienced doctors should be selected for orthodontics.
Malocclusion of deciduous teeth is caused by dental factors, which can be caused by local obstacles in the process of tooth eruption and replacement, such as premature loss of deciduous front teeth and insufficient wear of deciduous cusp teeth. There are also some genetic and disease factors, such as chronic inflammation and hypertrophy of tonsils, which lead to poor breathing and mandibular extension; As well as the mother's improper breastfeeding posture and the small opening of the bottle in infancy, it may also be caused by some bad habits, such as biting the upper lip, sucking fingers for a long time or some children imitating people with teeth around them out of curiosity.