Department of Orthodontics, Ragas Dental College and Hospital, Tamilnadu Dr. M. G. R. Medical University, Chennai, India.
Am J Orthod Dentofacial Orthop. 2012 May;141(5):547-55. doi: 10.1016/j.ajodo.2011.11.014.
The aim of this study was to evaluate the reparative potential of cementum histologically after intentional root contact with a temporary skeletal anchorage device.
Seventeen patients (8 male, 9 female; mean age, 16.2 years; range, 13.5-21.6 years) who were scheduled for extraction of 4 first premolars as part of their orthodontic treatment participated in this study. The roots of the premolars were intentionally injured with a temporary skeletal anchorage device. The teeth were extracted at 4, 8, or 12 weeks after the injury. Root contact with the temporary skeletal anchorage device was confirmed by using a stereomicroscope. Histologic samples were prepared. Demineralized serial sections were stained with eosin and hematoxylin, and cementum repair was assessed histomorphometrically.
Despite varying depths of the injuries, including involvement of dentin, reparative cementum formation was observed in all sections. Healing cementum was almost exclusively of the cellular type; 70% of all the teeth exhibited good repair by the end of week 12.
This study established that healing of cementum takes place after an injury with a temporary skeletal anchorage device, and it is a time-dependent phenomenon.
本研究旨在评估在临时骨内锚固装置与牙根接触后，牙骨质的修复潜力。
本研究纳入了 17 名患者（8 名男性，9 名女性；平均年龄 16.2 岁；范围 13.5-21.6 岁），他们都因正畸治疗需要拔除 4 颗上颌前磨牙。用临时骨内锚固装置对前磨牙的牙根进行了蓄意损伤。在损伤后 4、8 或 12 周时将牙齿拔出。使用立体显微镜确认牙齿与临时骨内锚固装置的根接触情况。准备组织学样本。对脱矿的连续切片进行曙红和苏木精染色，并进行组织形态计量学评估牙骨质的修复情况。
尽管损伤的深度不同，包括累及牙本质，但所有切片均观察到修复性牙骨质的形成。愈合的牙骨质几乎完全是细胞型的；在第 12 周末，70%的牙齿都得到了良好的修复。
本研究证实，临时骨内锚固装置导致的牙骨质损伤后会发生愈合，这是一个时间依赖性现象。
