Kaya Arife Nihan, Yüksel Sema
Department of Orthodontics, Faculty of Dentistry, Gazi University, Bişkek Cd. (8.Cd.) 1.Sk. No:8 06490 Emek, Ankara, Turkey.
J Orofac Orthop. 2024 Dec 12. doi: 10.1007/s00056-024-00562-x.
This study aimed to evaluate the effects of the use of class III elastics with fixed appliances and the Alt-RAMEC procedure on dentofacial structures in patients diagnosed with skeletal class III malocclusion.
The retrospective cohort study was performed on lateral cephalometric radiographs of 20 individuals (7 girls, 13 boys; mean chronological age 12.41 years) with skeletal class III malocclusion because of maxillary deficiency or maxillary deficiency and mandibular excess which were treated by using the Alt-RAMEC protocol and class III elastics. The patients were chosen from the archive of Gazi University Faculty of Dentistry, Department of Orthodontics. In order to distinguish between growth-related changes and the effects of treatment, results were compared with a control group consisting of 20 individuals (8 girls, 12 boys; mean chronological age 12 years) with similar skeletal characteristics.
In the treatment group, there were significant increases of 2.2°, 4.2° and 1° in the SNA, ANB and SN/GoGN angles, respectively, in contrast to the control group (p < 0.001). There was also a significant decrease of 1.9° in the SNB angle within the treatment group in contrast to the control group (p < 0.001). While the U1/SN angle increased by 1.4° in the treatment group, the L1-NB distance decreased by 0.7 mm (p < 0.01).
The results of this study showed that application of the Alt-RAMEC protocol and class III elastics with fixed appliances showed successful results in the management of skeletal class III malocclusions, while avoiding undesirable dental effects, such as excessive lingual tipping of the lower incisors.
本研究旨在评估使用Ⅲ类弹性牵引联合固定矫治器以及Alt-RAMEC矫治程序对诊断为骨性Ⅲ类错牙合畸形患者牙颌面结构的影响。
对20例（7名女孩，13名男孩；平均实际年龄12.41岁）因上颌骨发育不足或上颌骨发育不足伴下颌骨过度发育而导致骨性Ⅲ类错牙合畸形的患者进行回顾性队列研究，这些患者采用Alt-RAMEC矫治方案和Ⅲ类弹性牵引进行治疗。患者选自加齐大学牙科学院正畸科档案。为区分生长相关变化和治疗效果，将结果与由20例（8名女孩，12名男孩；平均实际年龄12岁）具有相似骨骼特征的个体组成的对照组进行比较。
与对照组相比，治疗组的SNA、ANB和SN/GoGN角分别显著增加2.2°、4.2°和1°（p<0.001）。与对照组相比，治疗组的SNB角也显著减小1.9°（p<0.001）。治疗组中U1/SN角增加1.4°，而L1-NB距离减小0.7mm（p<0.01）。
本研究结果表明，应用Alt-RAMEC矫治方案和Ⅲ类弹性牵引联合固定矫治器在治疗骨性Ⅲ类错牙合畸形方面取得了成功，同时避免了诸如下切牙过度舌倾等不良牙齿影响。
