Maxillofacial and Plastic Surgery, Plastic Surgery Department, Faculty of medicine, El Minia University, Egypt.
J Craniomaxillofac Surg. 2011 Sep;39(6):412-9. doi: 10.1016/j.jcms.2010.10.016. Epub 2010 Nov 11.
The aim of this work was to assess the multislice CT scan for analysis of the craniofacial anatomic changes in Pierre Robin sequence both predistraction and postdistraction, and to assess the use of unidirectional internal distractors in this patient group.
PATIENTS & METHODS: The study involved 11 patients. Their age at the time of distraction ranged from 2 to 7 months. Six were females and 5 were males. All had retromicrognathia, glossoptosis and obstructive sleep apnoea. All were diagnosed clinically and by CT scan. All were managed by distraction osteogenesis and were followed postoperatively by multislice CT.
The distance between the base of the tongue and the posterior pharyngeal wall increased by a mean of 141%, and the total mandibular length increased by a mean of 26%. The increase in the distance between the hyoid bone and the posterior pharyngeal wall increased by a mean of 42% .The distance between the hyoid bone and the genoid process increased by a mean of 9%.
Multislice CT scan was found to be a practical imaging technique to evaluate the morphologic changes in the airway and the mandible after distraction osteogenesis. It rules out the need for other traditional methods. Owing to the plasticity and malleability of the infant mandible that allow for sufficient bone remodelling, unidirectional internal distractors achieved a satisfactory maxillomandibular relationship which was tolerated by the infants and accepted by the parents.
本研究旨在通过多层 CT 扫描分析颅面解剖结构在 Pierre Robin 序列中的改变，评估单向骨内牵张器在该患者群体中的应用。
本研究共纳入 11 例患者。其牵张时的年龄为 2-7 个月。其中 6 例为女性，5 例为男性。所有患者均存在小下颌、舌后坠和阻塞性睡眠呼吸暂停。所有患者均经临床和 CT 扫描确诊。所有患者均采用牵张成骨术治疗，并在术后采用多层 CT 随访。
舌骨与咽后壁之间的距离平均增加了 141%，下颌骨总长度平均增加了 26%。舌骨与咽后壁之间的距离平均增加了 42%。舌骨与髁突之间的距离平均增加了 9%。
多层 CT 扫描是一种评估气道和下颌骨在牵张成骨术后形态变化的实用影像学技术。它排除了其他传统方法的需要。由于婴儿下颌骨的可塑性和延展性允许足够的骨重塑，单向骨内牵张器可实现满意的颌骨关系，婴儿能够耐受，家长也能接受。
