Due to bad oral habits, tooth replacement obstacles, improper orthodontic treatment and other reasons, the upper and lower incisors or dental arches obviously lean forward, the upper and lower lips protrude and are not completely closed, and the side is convex, but the position and sagittal relationship of the upper and lower jaws are normal, the molar relationship is neutral, and the overbite of the front teeth is basically normal. This deformity is easy to correct and has a good prognosis.

2. Complex bimaxillary protrusion

Due to genetic and other factors, the upper and lower dental arches and jaws grow excessively in the sagittal direction, showing that the upper and lower dental arches protrude and the upper and lower incisors are inclined or erect. The upper and lower lips are not completely closed, and the lateral shape is obviously convex. The sagittal relationship between maxilla and mandible is normal or mild class II, and the molar relationship is neutral. Anterior tooth coverage is basically normal and difficult to correct.

For more professional knowledge of stomatology, welcome to pay attention to the review materials of stomatology of Zhonggong Health Talent Network!