Elkordy Sherif A, Fayed Mona M Salah, Attia Khaled H, Abouelezz Amr M
Department of Orthodontics and Dentofacial Orthopedics, Faculty of Dentistry, Cairo University, Cairo, Egypt.
Dental Press J Orthod. 2020 May;25(3):65-72. doi: 10.1590/2177-6709.25.3.065-072.oar. Epub 2020 Aug 19.
Fixed functional appliances are non-compliant solutions to Class II malocclusion treatment. The clinician, however, should be careful of unexpected complications during the therapy.
58 female adolescents who presented with Class II malocclusion due to deficient mandible were treated with Forsus Fatigue Resistant Device (FFRD) therapy until an overcorrection to an edge to edge incisor relationship was achieved.
Incisor relationship and overjet were corrected successfully in all the subjects. Twenty-two patients had a complications-free treatment, while several complications were encountered with the remaining 36 subjects. In particular, mandibular canine rotation and development of posterior crossbites were the most common complications, with percentages of 51.7% and 25.9% respectively. Other complications included the breakage and shearing of the extraoral tubes of the first molar bands, and excessive intrusion of the upper first molars.
FFRD is an efficient appliance for treatment of Class II malocclusion; however, different complications were encountered during the appliance therapy. A focus on taking precautions and applying preventive measures can help to avoid such problems, reducing the number of emergency appointments and enhancing the treatment experience with the appliance.
固定功能矫治器是治疗安氏II类错牙合的非顺应性解决方案。然而，临床医生在治疗过程中应小心意外并发症。
对58名因下颌骨发育不足而患有安氏II类错牙合的女性青少年进行Forsus抗疲劳矫治器（FFRD）治疗，直至实现切牙关系过度矫正至切缘对切缘。
所有受试者的切牙关系和覆盖均成功矫正。22例患者治疗过程无并发症，其余36例受试者出现了一些并发症。特别是，下颌尖牙旋转和后牙反牙合的发生是最常见的并发症，发生率分别为51.7%和25.9%。其他并发症包括第一磨牙带环口外管的断裂和剪切，以及上颌第一磨牙的过度压低。
FFRD是治疗安氏II类错牙合的有效矫治器；然而，在矫治器治疗过程中会遇到不同的并发症。注重预防措施的采取有助于避免此类问题，减少急诊次数，提高矫治器治疗体验。
