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目的:探讨运用双钥匙曲近中移动下颌第一磨牙纠正Ⅱ类错畸形的临床效果。方法:选择安氏Ⅱ类错畸形,需拔除下颌第二前磨牙、近中移动下颌第一磨牙以改善颌位关系的患者16例,年龄14~25岁。拔牙间隙处牙槽嵴高度和宽度均正常,运用双钥匙曲近中移动第一磨牙。结果:16例病例均实现下颌第一磨牙整体移动,无近中倾斜,无升高,第一磨牙与第一前磨牙接触关系良好,间隙完全关闭。结论:运用双钥匙曲矫治技术近中移动第一磨牙的临床效果稳定并能够实现整体移动。
Objective: To explore the clinical effect of using double keycaps to move the mandibular first molar in the correction of class Ⅱ malocclusion. Methods: Sixteen patients (aged 14 to 25 years) with Class Ⅱ malocclusion were selected. The second premolar mandibular second molar was removed and the first mandibular first molar was removed to improve the relationship between mandibular position. Alveolar ridge crest height and width are normal extraction space, the use of double-key song in the first move around the molars. Results: All the 16 cases achieved the whole movement of mandibular first molars, without near tilt and without elevation. The first molars had good contact with the first premolar and the gap was completely closed. Conclusions: The clinical effect of moving the first molars with the double-key correction technique is stable and can achieve the overall movement.