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目的比较唇挡作用于下颌牙列前后的头颅侧位片及牙合模型,分析唇挡对下颌牙列及骨骼的影响。方法在临床中选择31名下颌后缩错合患者,年龄10～17岁,戴用唇挡时间1年,唇挡的位置位于距下前牙2mm,牙冠中点到牙龈缘4mm处,唇挡的远中插入下颌第一磨牙颊面管的圆管中,治疗开始之前以及1年后各拍头颅侧位片、下颌分析模型进行分析。结果由于前牙唇倾以及合向的抬高,使下颌牙弓长度明显增加,双侧尖牙、第一双尖牙、第二双尖牙以及第一恒磨牙之间的宽度明显增加(P<0.001)。结论下颌后缩伴有下前牙轻度拥挤的患者,在第一阶段非常适合使用下颌唇挡,不但可以加大牙弓的宽度而且可以整平spee’s曲线以及打开咬合,在临床上具有相当的使用价值。
Objective To compare the effect of lip block on the lateral cephalograms and occlusal models of mandibular dentition before and after the mandibular dentition, and to analyze the effect of lip block on mandibular dentition and bone. Methods Thirty-one patients with mandibular retroflexion were enrolled in the study. They were 10-17 years old and wearing lip for 1 year. The position of lip block was 2mm from the anterior tooth, the middle of the crown to 4mm of the gingival margin, Blocking the distal insertion of mandibular first molar buccal tube in the tube, before treatment and 1 year after the filming of the lateral cranial films, mandibular analysis model for analysis. Results The length of mandibular arch was significantly increased due to anterior lip lip-up and upward alignment. The widths of bilateral canines, first bicuspid, second bicuspid and first permanent molar were significantly increased (P <0.001). Conclusions The mandibular retrusion accompanied by mild crowding of the lower front teeth is very suitable for the use of mandibular lip in the first stage, which can not only increase the width of the dental arch but also flatten the spee’s curve and open the occlusion, which has a considerable clinical use value.