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目的：基于颈椎骨龄定量分期法（ quantitative cervical vertebral maturation，QCVM），比较应用CICE?下颌前移器（ CICE：comfortable，invisible，concise，efficient）和活动式斜面导板，对下颌骨发育不足的安氏II类I分类错牙合畸形矫形治疗的疗效。方法：选取武汉协和医院口腔医学中心正畸科安氏II类I分类，QCVM II期患者48例，年龄10.5～14.1岁（平均年龄12.7岁，男21例，女27例）。所有患者在固定矫治前行I期导下颌向前颌骨矫治，分别应用CICE?下颌前移器（ CICE组）和活动式斜面导板（斜导组），每组24例。两组患者均导下颌向前6个月，并保持3个月。对比分析矫形治疗前后的头影测量X线片。结果：两组患者矫形治疗后侧貌均明显改善，前牙覆牙合覆盖正常，磨牙中性关系。在前牙和磨牙关系的改善中， CICE 组的骨性变化比例（70.09％、85.67％）均大于斜导组（61.90％、69.48％），同时CICE组切牙的牙根吸收情况明显好于斜导组（P＜0.05）。结论：CICE?下颌前移器在治疗安氏II类I分类错牙合畸形中与活动式斜面导板相比，具有疗效稳定、舒适美观的优势，同时也可规避下前牙唇倾、切牙牙根吸收等并发症。“,”Objective:To compare the CICE(comfortable,invisible,concise,efficient)appliance and functional in?clined bite plate in the treatment of Class II malocclusion according to quantitative cervical vertebral maturation ( QCVM ) . Methods:Forty?eight subjects of Class II Division I malocclusion belonged to QCVM II according to the QCVM were included in this study,with the age of 10. 5~14. 1 years old( an average age 12. 7 years,21 males,27 females) . They were divided in?to 2 groups,and the patients in first group were treated with CICE appliance while the patients in the second group received the functional inclined bite plate. Both groups protracted the mandibular forward for 6 months treatment and retained for 3 months. Cephalometric analysis was compared pre?treatment and post?treatment. Results:After the functional treatment,both groups got harmony profile,normal overbite and overjet for the anterior teeth and the Class I relationship for the molars. More?over,proportion of the skeletal parameters in CICE group(70. 09%,85. 67%)were significantly higher than that in functional bite plate group(61. 90%,69. 48%),not only in the change of the anterior teeth relationship but also in the molar relation?ship. Also,much less apical root resorption of the incisor teeth occured in CICE group than that in functional bite plate group (P<0. 05). Conclusion:Compared with functional bite plate group,CICE group has significant advantages in the treatment effect,comfort and aesthetics. CICE group also can avoid the side effect like the incisor protrusion or apical root resorption.