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目的探讨改良连体Hawley保持器结合压膜保持器在下颌后缩患者的保持治疗中的临床疗效。方法选择36例恒牙早期安氏Ⅱ类下颌后缩的患者,随机分为两组。两组患者白天均戴压膜保持器,实验组夜间戴用改良连体Hawley保持器,对照组夜间戴用传统Hawley保持器。记录两组患者保持器戴用12个月后的牙牙合变化,采用四个表资料的Fisher确切概率法,对两组结果进行统计学分析。结果 36例患者均牙齿排列整齐。实验组有1人深覆盖Ⅰ度,对照组中有8人覆盖增加超过Ⅰ度。实验组和对照组在牙齿覆盖保持的有效率上差异有统计学意义(P<0.05)。结论改良连体Hawley保持器结合压膜保持器用于安氏Ⅱ类下颌后缩患者的保持效果优于传统Hawley保持器结合压膜保持器的疗效。
Objective To investigate the clinical effect of modified Siamese Hawley cage combined with lamination cage in maintenance treatment of mandibular retrusion. Methods Thirty-six patients with early Class Ⅱ mandibular retrusion after permanent dentition were randomly divided into two groups. Both groups were fitted with a membrane retainer during the day, the experimental group wearing a modified Siamese Hawley at night and the control group wearing a conventional Hawley retainer at night. The changes of occlusal changes after 12 months of wearing in the two groups of patients were recorded. The Fisher exact test method was used to analyze the two groups of results. Results All the 36 patients had teeth arranged neatly. One patient in the experimental group had deep degree I coverage, while in the control group, eight people covered more than degree I. There was significant difference between the experimental group and the control group in the effective rate of tooth coverage (P <0.05). Conclusions The improved Siamese Hawley cage in combination with a lamination cage is superior to the conventional Hawley cage in combination with a lamination cage for patients with Class II mandibular retrusion.