1. Congenital absence of teeth: development and embryonic reason, the third molar missing for more than phylogenetic degradation.
2. Teeth: teeth can cause teeth, the form of kinetic energy of the jaw system disorders, and the formation of teeth can lead to central incisor gap between the central incisors.
3. Deciduous teeth: the individual tooth fails to dental equipment fall off for the deciduous teeth, can lead to the following for the eruption of permanent teeth was blocked was an ambush, or dislocation of the eruption of teeth.
4. In addition there are many systemic factors and local disease factors, such as infectious diseases, malnutrition, endocrine factors, vitamin deficiency, cleft lip and palate, mandibular condyle benign hypertrophy, facial hypertrophy psychosis.
5 Ru Jian lack of tooth wear: children to eat the food too soft, so some Rujian teeth less tooth wear, and thus higher arch tooth surface, resulting in premature contact, resulting in the front or side move to the formation of the cross bite.
6. Bad habits: the majority refers to sucking habits, tongue habits, Yaochun habit bite objects habits, stretch jaw habits, poor swallowing habits, unilateral chew habit Porcelain tooth pain causes can cause a variety of malocclusion.
7. Deciduous teeth as early as lost: there will be insufficient clearance, produce crowded dislocation. Lost the guide sprouting role, misplaced and can not be the eruption of permanent teeth eruption.
It is understood that the wrong tooth deformity risk factors is generally hereditary factors and acquired factors.
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