Bony face classification in orthodontic

Scholars combination of clinical features and X-ray cephalometry analysis, right or wrong from the sagittal and vertical jaw deformity facial type classification.

1. Sagittal facial type according to the relative position of the upper and lower, the size of the ANB angle X cephalometry measurements from the sagittal orientation of the facial type is divided into three types.

(1). Class I facial type: ANB angle between 0°to 5°between the upper and lower jaws are relatively normal position.

(2). Class II bone surface type: ANB angle greater than 5°, the front of the upper jaw relative to the jaw position or jaw relative to the maxillary position, shrink, or as a composite performance.

(3). Class III bone surface type: ANB angle is less than 0°, the front of the lower jaw relative to the maxillary position, or upper jaw relative to the mandibular position after reduction, or as a composite performance.

2. Vertical facial types according to dental equipment the steepness of the edge under the lower jaw, from the vertical direction of facial type is divided into three types

(1). Normal type: facial vertical development of coordination, SN-MP angle of 34.3° ± 5°, or FH-MP angle of 27.2° ± 4.7° (early permanent dentition)

(2). High-angle: excessive facial vertical development, the SN-MP, c is greater than 40°, or FH-MP angle is greater than 32 °

(3). Low-angle: the lack of facial Brief Analysis of the minimally invasive painless tooth extraction vertical development of the SN-MP angle is less than 29°, or FH-MP angle is less than 22°.