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目的:探讨铸造夹板式Herbst矫治器和Twin-bolck矫治器矫治Angle Ⅱ2类错的机制和效果。方法:随机选取30例骨龄为FG-G期恒牙列Angle Ⅱ2类错患者,随机分为治疗组(Herbst矫治器组)和对照组(Twin-block矫治器组),其中治疗组15例,采用铸造夹板式Herbst矫治器矫治:对照组15例,采用Twin-blokc矫治器治疗。治疗组和对照组的所有患者均在治疗前、后拍摄头颅定位侧位片,进行矫治前后、颌、面矢状向和垂直向上的头影测量分析,并做统计学处理。结果:两组患者均达到了磨牙中性关系,前牙达到正常的覆盖、覆关系,但是治疗组的疗程明显的短于对照组。结论:Herbst矫治器和Twin-block矫治器均能有效地矫治Angle Ⅱ2类错;但前者在刺激下颌骨生长、促进下颌骨前移等骨性变化以及在患者面型的改善方面明显的优于后者。
OBJECTIVE: To investigate the mechanism and effect of cast splint Herbst appliance and Twin-bolck appliance in treatment of Angle Ⅱ 2 malocclusion. Methods: Thirty patients with Angle Ⅱ class Ⅱ malocclusion were randomly divided into treatment group (Herbst appliance group) and control group (Twin-block appliance group). Among them, 15 patients in the treatment group , Using a cast plywood Herbst appliance correction: control group of 15 patients, the use of Twin-blokc appliance treatment. All the patients in the treatment group and the control group were taken cephalometric radiographs before and after treatment, and the cephalometric analysis was performed before, after, and after the treatment, and the results were analyzed statistically and statistically. Results: The two groups of patients reached the molars neutral relationship, the anterior teeth reached the normal coverage, the relationship between the cover, but the treatment group was significantly shorter than the course of treatment. Conclusion: Both Herbst appliance and Twin-block appliance can effectively correct Class Ⅱ Ⅱ malocclusion. However, the former is superior in stimulating the growth of the mandible, promoting the bony changes such as the mandibular advancement, and improving the facial shape of the patient In the latter.