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Main Instructor Chun-Hsiu Yang
Chun-Liang Kuo
I-Hua Liu1
Yu-Ling Tsai
Department / Institution Department of Orthodontics, Chi-Mei Medical Center, Tainan City, Taiwan
Classification Case report
「Objective」To correct class III malocclusion by using mini-screw for mandibular dentition distalization
「Case」This is a 20-year-old female who has a skeletal class III malocclusion with dental class III crowding, tooth 12,22 crossbite, and straight profile. The patient refused the orthognathic surgery and wanted to retract her lower dentition. We extracted the four third molars and placed mini-screws in the both side of buccal shelf area to distalize upper and lower dentition. The total treatment duration was 29 months. We achieved Angle Class I canine and molar relationship, while anterior crossbite was corrected by retraction of mandibular teeth, and then obtain a harmonious profile.
「Discussion & Summary」
In skeletal class III camouflage treatment, it is usually to compensate the skeletal discrepancy by proclining and retroclining the maxillary and mandibular incisors, respectively. But flaring of the maxillary incisors will compromise the pleasing smile and profile. In our case, by placing the mini-screw in the buccal shelf, it is beneficial to control the labial inclination of the maxillary incisors and distalize mandibular arch. Buccal shelf mini-screws are placed outside the alveolar process, so extensive lower arch distalization is possible. The thick cortical plate of high density bone in the buccal shelf area offers very good skeletal anchorage for retracting the mandibular arch.
Nonextraction Treatment of A Class III Malocclusion Using Miniscrew-assisted Mandibular Dentition Distalization- A Case Report