Abstract:

The female patient was 21 years old at the time of initial diagnosis, complaining of protrusion of the upper anterior teeth. The soft tissue on the left side is plump, the lip is tense from the front view, and the lateral view shows that the face shape is convex, the mental muscle is tense; there were residual roots of 36, extensive caries filling of 46, elongation of 16 and 26, incomplete eruption of 38 and 48, distally relation of bilateral molars. X-ray analysis showed that the patient was skeletal Class Ⅱ with maxillary protrusion and mandibular retraction. The treatment strategy for this case was extacting 14, 24, 36, 46. Damon Q self-locking brackets were used to straighten the upper and lower teeth, and two screws were implanted in the upper jaw to control the adduction of the maxillary anterior teeth and the vertical direction of the molars. The objective is to establish the Class Ⅱ molar relationship between the molars and the normal overbite and overjet of the anterior teeth, promote the inverse rotation of the mandible, and improve the facial shape to the greatest extent. The whole course of treatment lasted about 28 months. After the treatment, the occlusal relationship was normal and the facial shape improved greatly.

Key words: Skeletal ClassⅡ malocclusion, Mandibular retrusion, Asymmetric tooth extraction