1、Dental crossbite: Mainly seen in the crossbite during the milk tooth period. The patient's facial shape is close to the normal facial shape, the teeth are in crossbite, the upper front teeth are slightly inclined inward, and the position of the lower front teeth is relatively normal. This type of patient generally has no genetic factors, mostly caused by bad habits and incorrect breastfeeding methods. This type of crossbite correction is relatively simple, with a better prognosis. It can even be self-corrected at the opportunity of milk-permanent teeth replacement under the guidance of orthodontic specialists.
2、Skeletal crossbite: If the first two types of crossbite patients are not treated in time, they can develop into skeletal crossbite. The face presents a typical "concave face shape", and the mandible cannot retreat. This type of crossbite malformation is the most serious, having the greatest impact on appearance and function. If the skeletal deformity is mild or the patient is still in the growth peak period, the deformity can be improved through orthodontic means. If the patient has passed the growth peak period, orthodontic means alone can correct the crossbite relationship of the teeth, but cannot change the abnormal bone structure. Severe skeletal crossbite must be corrected through jaw surgery.
3、Functional crossbite: Caused by the functional excessive protrusion of the mandible due to poor breastfeeding posture, leading to mandibular protrusion and anterior teeth crossbite relationship, also known as pseudo-mandibular protrusion. If not corrected in time, it may develop into true mandibular protrusion over time. The face shape of this type of crossbite patient can show a "concave face shape". Although the teeth are in crossbite, the mandible can retreat to the state where the front teeth bite each other, and at this time, the patient's reverse face shape improves significantly. These patients should be treated as soon as possible to avoid the aggravation of deformities with growth and development, evolving into skeletal crossbite, increasing the difficulty of treatment.