Ghafari J, Shofer F S, Jacobsson-Hunt U, Markowitz D L, Laster L L
Department of Orthodontics, School of Dental Medicine, University of Pennsylvania, Philadelphia 19104, USA.
Am J Orthod Dentofacial Orthop. 1998 Jan;113(1):51-61. doi: 10.1016/s0889-5406(98)70276-8.
A prospective randomized clinical trial was conducted to evaluate the early treatment of Class II, Division 1 malocclusion in prepubertal children. Facial and occlusal changes after treatment with either a headgear or a Fränkel function regulator are reported. Molar and canine relationships, overjet, intermolar and intercanine distances were measured from casts taken every 2 months, and mounted on a SAM II articulator. Cephalometric radiographs were taken annually. The results indicate that both the headgear and function regulator were effective in correcting the malocclusion. A common mode of action of these appliances is the possibility to generate differential growth between the jaws. The extent and nature of this effect, as well as other skeletal and occlusal responses differ. Treatment in late childhood was as effective as that in midchildhood. This finding suggests that timing of treatment in developing malocclusions may be optimal in the late mixed dentition, thus avoiding a retention phase before a later stage of orthodontic treatment with fixed appliances. However, a number of conditions may dictate an earlier intervention in the individual patient.
一项前瞻性随机临床试验旨在评估青春期前儿童安氏II类1分类错牙合的早期治疗效果。报告了使用头帽或Frankel功能调节器治疗后的面部和咬合变化。每2个月取模型，测量磨牙和尖牙关系、覆盖、磨牙间和尖牙间距离，并安装在SAM II牙合架上。每年拍摄头颅侧位片。结果表明，头帽和功能调节器在矫正错牙合方面均有效。这些矫治器的共同作用方式是有可能在上下颌之间产生差异性生长。这种效应的程度和性质，以及其他骨骼和咬合反应有所不同。儿童晚期治疗与儿童中期治疗效果相同。这一发现表明，在混合牙列晚期进行错牙合畸形的治疗时机可能是最佳的，从而避免在后期使用固定矫治器进行正畸治疗之前的保持阶段。然而，一些情况可能决定对个体患者进行更早的干预。
