How to judge whether overbite is skeletal

Overbite is a type of dental deformity, and the name comes from the mentality of deformed teeth. There are many reasons for overbite, and it is also hereditary. Generally speaking, overbite can be divided into two types: femoral and dental. Different types have different characteristics and treatment methods, which requires us to have a preliminary judgment. So, how do we determine whether overbite is osseous? Let’s take a look below.

Abnormal mesiodistal relationship of the upper and lower dental arches can manifest as mandibular protrusion, mesial malocclusion and anterior crossbite. It is mostly caused by poor breastfeeding posture, retained or early loss of deciduous front teeth, congenital absence of upper permanent incisors, bad habits, insufficient wear of deciduous canines, systemic diseases and hereditary mandibular protrusion.

How to judge whether the overbite is skeletal

First, check whether the maxillofacial morphology is abnormal. Dental overbite is mainly a simple underbite caused by obstruction in the eruption of teeth, and the maxillofacial structure is basically normal. However, skeletal overbite is mainly manifested by excessive development of the mandible and insufficient development of the maxilla, which has a great impact on the beauty of the maxillofacial structure.

Secondly, see whether the mandible can be retracted to the point where the tangent is facing the tangent. Some functional overbites may also cause mandibular protrusion, but it is only a functional advancement of the mandible. The size and shape of the mandible are basically normal, and the mandible can be retracted to the point where the front teeth are facing each other. However, the protruding mandible of bony overbites cannot be retracted.

In addition, look at the X-ray cephalometric measurement to see the angle between the incisor closure line and the SN plane. The larger the angle, the more likely it is that there is bony overbite.

Treatment of underbite

1. Headgear and traction chin cup correction device

Suitable for patients with early skeletal anterior crossbite and mandibular protrusion. It can be used in the late stage of deciduous teeth, the stage of replacement teeth or the early stage of permanent teeth. Can be used in conjunction with intraoral appliances such as occlusal splints and tongue spring orthodontics.

2. Front traction correction device

It is suitable for early skeletal anterior crossbite with maxillary underdevelopment and mandibular protrusion, and can be used during the period of replacement teeth or the early stage of permanent teeth.

3. Functional orthosis

For example, activator or Frankel type III. It is suitable for early skeletal anterior crossbite and functional anterior crossbite, and can be used in the period of tooth replacement, especially in the late stage of tooth replacement.

4. Class III traction correction device

It is mainly used to adjust the mesio-maxillary relationship and is often used for early skeletal anterior crossbite. It can be used in the late stage of replacement teeth or the early stage of permanent teeth. The intraoral correction device can be a removable upper and lower occlusal pad corrector, or a fixed corrector, or a combination of the two.

5. Removable maxillary occlusal pad and tongue spring corrector

It can be used to correct any anterior crossbite and can be used alone or in combination with other plastic surgery devices.

6. Fixed braces

Both edgewise square wire arch braces and Begg braces can be used to correct anterior crossbite and are often used during the replacement or permanent tooth period. When using the Begg appliance, Class III traction should be performed instead of Class II traction, with a traction force of about 80 grams.

7. Correction of anterior crossbite in adults

If it is an odontogenic anterior crossbite or a mild skeletal anterior crossbite, the above-mentioned correction devices with non-plastic force can be used for correction. If the anterior crossbite is combined with obvious skeletal deformity, combined orthodontic-orthognathic surgery treatment is required.