Main Instructor Yu-Ling Tsai
Department / Institution Department of Orthodontics, Chi Mei Medical Center, Tainan City, Taiwan
Classification Case report
Retroclined maxillary incisors and deep overbite can be frequently observed in Class II Division 2 malocclusion. Consequently, bite opening and establishment of adequate inclination of incisors with ideal overbite and overjet are important treatment objectives.
This case was a 12-year-old girl with 100% deep overbite and gummy smile, combined with straight lateral profile. Diagnostic records revealed skeletal Class I and dental Class II malocclusion associated with tooth 75, 85 retained, tooth 35 impaction and congenital missing of tooth 45. Treatment plan included extraction of tooth 14, 24, 35, 75, 85. Overbite and overjet were corrected by compensation curve, Class I and II elastics. Extraction spaces were closed with brake mechanism. Anterior root torquing springs were applicated to correct inclination of anterior teeth in both arch. After 36 months of active treatment, Class I canine and molar relationship were achieved bilaterally with ideal inclination of incisors. Gummy smile was also improved. Moreover, patient was satisfied about the treatment result.
「Discussion & Summary」
Treatment in Class II Division 2 malocclusion is challenging in orthodontics treatment due to increased overbite and retroclined maxillary incisors. In our case, congenital missing combined with premolars extraction even raising the difficulties. Nevertheless, we used brake mechanism and anterior root torque auxiliaries effectively and ideal treatment outcomes were accomplished.
Orthodontic Treatment in Class II Division 2 Malocclusion Growing Patient Associated with Tooth Impaction and Congenital Missing- A Case Report