Thiruvenkatachari Badri, Pavithranand A, Rajasigamani K, Kyung Hee Moon
Department of Orthodontics, Rajah Muthiah Dental College and Hospital, Annamalai University, Tamil Nadu, India.
Am J Orthod Dentofacial Orthop. 2006 Apr;129(4):551-4. doi: 10.1016/j.ajodo.2005.12.014.
The purpose of this study was to compare and measure the amount of anchorage loss with titanium microimplants and conventional molar anchorage during canine retraction.
Subjects for this study comprised 10 orthodontic patients (7 women, 3 men) with a mean age of 19.6 years (range, 18 to 25 years), who had therapeutic extraction of all first premolars. After leveling and aligning, titanium microimplants 1.3 mm in diameter and 9 mm in length were placed between the roots of the second premolars and the first molars. Implants were placed in the maxillary and mandibular arches on 1 side in 8 patients and in the maxilla only in 2 patients. A brass wire guide and an intraoral periapical radiograph were used to determine the implant positions. After 15 days, the implants and the molars were loaded with closed-coil springs for canine retraction. Lateral cephalograms were taken before and after retraction, and the tracings were superimposed to assess anchorage loss. The amount of molar anchorage loss was measured from pterygoid vertical in the maxilla and sella-nasion perpendicular in the mandible.
Mean anchorage losses were 1.60 mm in the maxilla and 1.70 mm in the mandible on the molar anchorage side; no anchorage loss occurred on the implant side.
Titanium microimplants can function as simple and efficient anchors for canine retraction when maximum anchorage is desired.
本研究的目的是比较并测量在犬牙后移过程中钛微种植体和传统磨牙支抗的支抗丧失量。
本研究的受试者包括10名正畸患者（7名女性，3名男性），平均年龄19.6岁（范围18至25岁），均拔除了所有第一前磨牙。在排齐整平后，将直径1.3mm、长度9mm的钛微种植体植入第二前磨牙和第一磨牙牙根之间。8名患者在一侧的上颌和下颌牙弓植入种植体，2名患者仅在上颌植入。使用黄铜丝导向器和口内根尖片确定种植体位置。15天后，在种植体和磨牙上加载闭合曲弹簧进行犬牙后移。在犬牙后移前后拍摄头颅侧位片，并将描迹图叠加以评估支抗丧失。从上颌的翼突垂线和下颌的蝶鞍-鼻根垂线测量磨牙支抗丧失量。
在磨牙支抗侧，上颌的平均支抗丧失为1.60mm，下颌为1.70mm；种植体侧未发生支抗丧失。
当需要最大支抗时，钛微种植体可作为简单有效的犬牙后移支抗。
