Alzahawi Kawa, Færøvig Espen, Brudvik Pongsri, Bøe Olav Egil, Mavragani Maria
Department of Clinical Dentistry-Orthodontics, Faculty of Medicine and Dentistry, University of Bergen, Årstadveien 19/21, Bergen, 5009, Norway.
Department of Orthodontics, Dental Faculty, University of Oslo, Oslo, 0316, Norway.
Prog Orthod. 2014;15:35. doi: 10.1186/s40510-014-0035-z. Epub 2014 May 15.
The aim of this prospective study was to compare root resorption after the leveling phase of treatment, performed by either super-elastic or conventional multi-stranded stainless steel arch wires.
From a total of 156 future orthodontic patients in a private clinic, 82 were included in the study after excluding those who earlier had orthodontic or endodontic treatment or signs of resorption. Patients were equally arbitrary allocated into two groups, where leveling was performed either with super-elastic heat-activated or conventional multi-stranded stainless steel arch wires. Root length loss was calculated using pre-treatment and post-leveling periapical radiographs.
The use of super-elastic arch wires did not significantly increase the severity of root resorption, except for tooth 31, while it reduced leveling time compared to conventional stainless steel wires. Crossbite of maxillary lateral incisors seemed to be a risk factor for resorption.
Incisor root resorption after leveling did not differ significantly between patients treated with super-elastic and conventional stainless steel arch wires, except for a mandibular incisor.
本前瞻性研究的目的是比较使用超弹性弓丝或传统多股不锈钢弓丝进行整平阶段治疗后的牙根吸收情况。
在一家私人诊所的156名未来正畸患者中，排除那些曾接受过正畸或牙髓治疗或有吸收迹象的患者后，82名患者被纳入研究。患者被随机分为两组，分别使用超弹性热激活弓丝或传统多股不锈钢弓丝进行整平。使用治疗前和整平后的根尖片计算牙根长度损失。
除31号牙外，使用超弹性弓丝并未显著增加牙根吸收的严重程度，与传统不锈钢弓丝相比，它缩短了整平时间。上颌侧切牙反合似乎是吸收的一个危险因素。
除下颌切牙外，使用超弹性弓丝和传统不锈钢弓丝治疗的患者在整平后切牙牙根吸收情况无显著差异。
