Perillo L, Johnston L E, Ferro A
Faculty of Medicine and Surgery II, University of Naples, Italy.
Am J Orthod Dentofacial Orthop. 1996 Feb;109(2):132-9. doi: 10.1016/s0889-5406(96)70173-7.
The purpose of this study was to examine the skeletal changes produced by the Fränkel function regulator (FR-2) appliance during the treatment of patients with mandibular retrusive Class II malocclusions and to characterize the permanence of these changes in the years after treatment (5 years, on average). Data from the pretreatment, posttreatment, and long-term serial cephalograms of 14 patients who received FR-2 treatment were compared with data obtained from untreated controls and from published standards. Relative to controls, FR-2 therapy produced a statistically significant decrease in the ANB angle and an increase in the rate of mandibular growth. At the same time, no maxillary effect was noted. During the post-FR-2 period, the rate of mandibular growth showed no compensatory decline or "rebound." Instead, it was remarkably similar to that inferred from age-matched and sex-matched normative standards. The present study thus supports the conclusion that FR-2 therapy, in conjunction with a period of postfunctional fixed- or removable-appliance therapy designed to perfect the occlusion, can produce a statistically and perhaps clinically significant relative increase in mandibular length.
本研究的目的是检查在治疗下颌后缩II类错牙合患者时，Frankel功能调节器（FR-2）矫治器所产生的骨骼变化，并描述这些变化在治疗后数年（平均5年）的持久性。将14例接受FR-2治疗患者的治疗前、治疗后及长期系列头颅侧位片数据与未经治疗的对照组及已发表标准所获得的数据进行比较。相对于对照组，FR-2治疗使ANB角有统计学意义的减小，下颌生长速率增加。同时，未观察到对上颌的影响。在FR-2治疗后阶段，下颌生长速率未出现代偿性下降或“反弹”。相反，它与根据年龄和性别匹配的正常标准推断出的生长速率非常相似。因此，本研究支持以下结论：FR-2治疗，结合一段旨在完善咬合的功能后固定或可摘矫治器治疗，可以使下颌长度产生统计学上以及可能临床上显著的相对增加。
