目的 采用Activator矫治骨性Ⅱ类错(牙合)，以评价矫治器对颅颌面部软硬组织的影响，探讨Activator矫治器的作用机制。方法30例生长发育高峰前期的骨性Ⅱ类错(牙合)患者作为治疗组，应用Activator矫治器进行功能性矫形治疗；20例同龄骨性Ⅱ类错(牙合)畸形的志愿者，作为对照组。收集治疗前后的X线头颅侧位片进行头影测量分析，使用SPSS 11.0统计软件对数据进行配对t检验分析。结果SNA角、SNB角、ANB角、Go-Gn、Ar-Go、S-Go、N-Me两组间的差异有统计学意义。治疗组下颌骨垂直和水平向生长趋向正常。结论Activator矫治骨性Ⅱ类错(牙合)，不仅能抑制上颌生长，减小上颌突度，还能有效促进下颌生长。%Objective To evaluate the effect of activator appliance on hard and soft tissue of growing patients who have skeletal Class II malocciusion. Methods Pretreatment and posttreatment cephalometric records of 30 consecutively treated Patients with Class Ⅱ malocclusions were evaluated and compared with 20 volunteers of untreated Class Ⅱ control subjects. Lateral cephalometric and study models were taken at the beginning and the end of the treatment Paired t tests were used to assess differences in the rates of change of the different variables in the treatment and control groups. Results The changes of SNA, SNB, ANB, Go-Gn, Ar-Go, S-Go, N-Me between two groups have statistically significance, the mandible horizontal growth became normal. Conclusion Activator appliance treating skeletal Class Ⅱ malocciusion in growing patients not only inhibit maxillary growth and reduce the maxillary protrusion, but also promote the mandible growth.
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