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目的:应用FrankelⅡ功能矫治器(FRⅡ)治疗生长发育高峰期下颌后缩合并开的患者,研究患者治疗前后颅颌面的变化情况。方法:对比研究20例下颌后缩合并开患者治疗前后的X线头影测量数据。结果:①治疗后患者上下颌切牙和磨牙均有伸长,上颌切牙突度减小,下颌切牙突度增加。②SNB、B-V治疗后数值增大,下颌骨的位置前移。下颌长度(Pg/V-Co/V)、下颌升支长(Go/X-Ar/X)治疗后均有增长,下颌骨在矢状和垂直方向都有所增加。③SN/MP、FMA、Y轴治疗前后无统计学意义,下颌平面没有发生顺时针旋转。④A-V、SNA治疗前后无统计学差异,上颌骨在矢状方向上变化很少。结论:①FrankelⅡ功能矫治器不仅改变了下颌骨的位置,同时还促进了下颌骨矢状方向和垂直方向的生长。下颌骨的位置、长度和上下颌牙齿轴倾度的共同变化使原来后缩面型得以改善,侧貌变得更加协调、美观。②开的解除主要是由于上下颌切牙的伸长和不良习惯的破除。③FrankelⅡ只适用于上颌骨正常或轻度前突的患者。
OBJECTIVE: To study the changes of cranio-maxillofacial area before and after treatment with Frankel Ⅱ functional appliance (FR Ⅱ) in patients with post-maxillofacial degeneration and maxillary growth. Methods: Comparative study of 20 cases of mandibular postcondensation patients with preoperative and postoperative X-ray measurement data. Results: After treatment, the maxillary and mandibular incisors and molars were elongated, the maxillary incisors were reduced and the incisors of mandibular incisors were increased. ②SNB, B-V increased after treatment, the position of the mandible forward. Mandibular length (Pg / V-Co / V) and mandibular ascending (Go / X-Ar / X) increased after treatment, and the mandible increased in the sagittal and vertical directions. ③SN / MP, FMA, Y-axis before and after treatment was not statistically significant, mandibular plane did not occur clockwise rotation. ④A-V, SNA no significant difference before and after treatment, the maxillary changes in the sagittal direction rarely. Conclusions: ①Frankel Ⅱ functional appliance not only changed the position of mandible, but also promoted the growth of mandible in sagittal and vertical direction. The common changes of mandibular position, length, and mandibular axial inclination make the original regrowth improved and the appearance becomes more harmonious and beautiful. ② Kai release is mainly due to the elongation of mandibular incisors and bad habits get rid of. ③Frankel Ⅱ only applies to patients with normal or mild maxillary protrusion.