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10 姜瑞宗 / Jui -Tsung Chiang
10 姜瑞宗 / Jui -Tsung Chiang
Main Instructor Li Chung-Hsing
Department / Institution Tri-Service General Hospital, Department of Orthodontic
Classification Research report

An effective generally accepted treatment strategy is based on stimulating the mesial repositioning of the mandible to correct the Class II relationship. The aims of this study included: (1) to determine the dental and skeletal effect, (2) to evaluate the role of timing in relation to skeletal maturity. 

Materials and Methods:
The subjects of this study were young adolescents with growth potential and inclusion criteria of skeletal Class II malocclusion (ANB>4,) and a minimum of 4 mm overjet (measured clinically). All patients were instructed to wear the treatment appliance, Invisalign Mandibular Advancement, for almost 20~22 hours a day.Cephalometric images were collected before and after the treatment.

The results showed that the overjet and the angles of U1 were reduced after the treatment; indicating that the patients’ esthetic have improved. In addition, the increase in the length of the mandible is greater than the increase in the maxilla.

The tentative summary: (1) Facial appearances were improved by correction of the overjet, the inclination of upper anterior teeth, and promotion of the mandibular growth. (2) Young adolescents with growth potential showed the good results of this appliance.

Evaluation of Invisalign Mandibular Advancement Treatment Effectiveness in Skeletal Class II Patient