Department of Biotechnological and Applied Clinical Sciences, University of L'Aquila, L'Aquila, Italy.
Private practice, L'Aquila, Italy.
Am J Orthod Dentofacial Orthop. 2018 Jul;154(1):55-64. doi: 10.1016/j.ajodo.2017.10.027.
Orthodontic extrusion of impacted maxillary canines requires careful biomechanical planning and the use of physiologic force. The aim of this study was to evaluate the time needed for orthodontic extrusion of impactions of different severities, using a device that can predictably apply forces under 0.6 N.
Twenty-two patients who were consecutively treated were selected retrospectively, and a total of 30 impacted canines were studied. Indexes of impaction were used to measure severity on pretreatment panoramic radiographs. Statistical analysis was used to detect interactions between treatment time, complexity of impaction, age, and sex.
Treatment time was highly dependent on the patient's age; the shortest treatment time was observed in 11- to 12-year old patients. On the other hand, the severity of impaction had no effect on treatment time.
Applying physiologic force with the proposed device resulted in a short treatment time, which depended on the patient's age more than the impaction complexity. Few complications were associated with use of this device. Future prospective studies are needed to replicate these findings and confirm the recommended use of this device.
正畸上颌尖牙的正畸性推出需要仔细的生物力学规划和生理力的使用。本研究的目的是评估使用可预测地施加 0.6N 以下力的设备对不同严重程度的阻生进行正畸推出所需的时间。
回顾性选择了连续治疗的 22 名患者，共研究了 30 颗阻生尖牙。使用阻生指数在治疗前全景片上测量严重程度。统计分析用于检测治疗时间、阻生复杂性、年龄和性别之间的相互作用。
治疗时间高度依赖于患者的年龄；11-12 岁的患者治疗时间最短。另一方面，阻生的严重程度对治疗时间没有影响。
使用建议的设备施加生理力可导致治疗时间短，这更多地取决于患者的年龄，而不是阻生的复杂性。使用该设备很少出现并发症。需要进一步的前瞻性研究来复制这些发现并确认该设备的推荐使用。
