[Changes of soft tissues in patients with functional and skeletal Angel Class Ⅲ malocclusion after FRⅢ appliance therapy].

PURPOSE: To compare the changes of soft tissues before and after treatment of functional and skeletal Angle class Ⅲ malocclusion with FRⅢ appliance.

METHODS: Thirty patients with functional and skeletal Angel Class Ⅲ malocclusion were selected and treated with FRⅢ appliance，SPSS 22 software package was used to analyzed soft tissue changes before and after treatment.

RESULTS: After treatment, FCA,NLA, Pog labial angle,upper lip to E line were increased significantly (P<0.05). Z angle was decreased significantly (P<0.05). Lower lip to E line was decreased significantly (P<0.01). There was no significant difference in H angle, superior sulcus depth, inferior sulcus to H-line, basic upper lip thickness, upper lip strain measurement (P>0.05).

CONCLUSIONS: After FRⅢ appliance treatment of Angel Class Ⅲ malocclusion, the convexity of facial profile was increased, type Ⅲ concave profile tends to be flat, the facial profile of patient become more attractive; the protrusion of upper lip was found, the retrusion of lower lip was also present, the convexity of upper lip was increased.