Department of Dentistry, Maxillo-Facial Surgery and Orthodontics, Second University of Naples, Naples, Italy.
Eur J Paediatr Dent. 2011 Dec;12(4):261-6.
To evaluate the dentoskeletal effects produced by Fränkel-2 (FR-2) appliance during the treatment of patients with Class II malocclusion by mandibular retrusion and to verify the long-term stability of these changes.
Pre-treatment, post-treatment and long-term serial cephalograms (at least 10 years after the end of treatment) of patients treated with FR-2 were compared with data obtained from untreated controls. To be included in the study, patients and controls had to exhibit Class II malocclusion caused by short mandibular body. Lateral cephalograms were analysed with a specific tracing regimen in both groups. Summary measures for the initial cephalometric values and increments of changes between visits were calculated.
Compared to controls, the FR-2 treatment produced a significant decrease in the ANB angle that improved the skeletal intermaxillary and occlusal relationship. At long-term follow- up, the FR-2 group showed further improvements of skeletal intermaxillary and occlusal relationship, therefore the changes observed during treatment showed no compensatory decline or rebound.
FR-2 treatment, in conjunction with a period of post-functional fixed appliance therapy designed to perfect the occlusion, can produce a long-lasting improvement of the skeletal Class II malocclusions with little skeletal correction and significant incisor compensation.
评估 FR-2 矫治器（FR-2）治疗下颌后缩型安氏Ⅱ类错[牙合]患者的牙颌面变化，并验证这些变化的长期稳定性。
将 FR-2 矫治器治疗组患者的治疗前、治疗后和长期（治疗结束后至少 10 年）系列头颅侧位片与未治疗对照组的资料进行比较。为了纳入研究，患者和对照组都必须有由下颌体短小引起的安氏Ⅱ类错[牙合]。两组均采用特定的描记方案对侧位头颅片进行分析。计算初始头影测量值的综合测量值和各次就诊间变化的增量。
与对照组相比，FR-2 治疗可显著降低 ANB 角，改善上下颌骨及咬合关系。在长期随访中，FR-2 组的上下颌骨及咬合关系进一步改善，因此观察到的治疗期变化并未出现补偿性下降或反弹。
FR-2 治疗结合后期功能性固定矫治器治疗以完善咬合，可以产生长期稳定的、轻度骨骼矫正和显著切牙代偿的骨骼安氏Ⅱ类错[牙合]的改善。
