| Objective: The purpose of this study is to evaluate the effect of the LH crossbitearch as the method to correct anterior crossbite.Methods: One female case was selected from the Taiwan Tong Ping dental clinic.This patient was19.5years old, with permanent dentition, normal maxilla andprotrusive mandible. The patient had mild deep bite and anterior crossbite. Anteriorteeth were crowding with spacing in lower. The midline of lower arch was1mm leftshift. The profile of this patient was convex. This patient was treated with LHcrossbite arch in upper arch. Elastic chain was used to close the spacing in lower arch.In the late orthodontic stage, intermaxillary elastics were used to correct midline andimproved interdigitation. The cephalometric measurement was made to analysis theoutcome.Results: The total treatment time is22months. Compared the changes betweenpre-treatment and post-treatment:①The position of the maxilla was not changed andmandibule retruded. The mandibular plane was rotated clockwise.SNA,SNB were notchanged significantly,the ANB was increased by0.5°.②U1/SN was altered from108.9°to113.2°; L1/MP was decreased from83.3°to82.9°;L1/N-B was decreased from20.0°to15.0°③ULP was increased from5.0mm to6.5mm，LLP was decreased from8.0mm to7.0mm;UL-E was altered1.0mm, LL-E was altered1.0mm, the convexity of theupper and lower lip had improved favorablely a-nd the lips were inside the E-line,Sothe soft tissue has changed better, The patient was satisfied with the result.Conclusions: LH crossbite arch was used to correct anterior crossbite by its owncharacteristic of super elasticity and shape memory. Anterior crossbite was corrected ina very short period and presented a good result. |
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