Qamruddin Irfan, Alam Mohammad Khursheed, Mahroof Verda, Fida Mubassar, Khamis Mohd Fadhli, Husein Adam
Orthodontic Department, Baqai Medical University, Karachi, Pakistan.
Orthodontic Department, College of Dentistry, Al Jouf University, Sakaka, Kingdom of Saudi Arabia.
Am J Orthod Dentofacial Orthop. 2017 Nov;152(5):622-630. doi: 10.1016/j.ajodo.2017.03.023.
The aim of this study was to evaluate the effect of low-level laser irradiation applied at 3-week intervals on orthodontic tooth movement and pain associated with orthodontic tooth movement using self-ligating brackets.
Twenty-two patients (11 male, 11 female; mean age, 19.8 ± 3.1 years) with Angle Class II Division 1 malocclusion were recruited for this split-mouth clinical trial; they required extraction of maxillary first premolars bilaterally. After leveling and alignment with self-ligating brackets (SmartClip SL3; 3M Unitek, St Paul, Minn), a 150-g force was applied to retract the canines bilaterally using 6-mm nickel-titanium closed-coil springs on 0.019 x 0.025-in stainless steel archwires. A gallium-aluminum-arsenic diode laser (iLas; Biolase, Irvine, Calif) with a wavelength of 940 nm in a continuous mode (energy density, 7.5 J/cm/point; diameter of optical fiber tip, 0.04 cm) was applied at 5 points buccally and palatally around the canine roots on the experimental side; the other side was designated as the placebo. Laser irradiation was applied at baseline and then repeated after 3 weeks for 2 more consecutive follow-up visits. Questionnaires based on the numeric rating scale were given to the patients to record their pain intensity for 1 week. Impressions were made at each visit before the application of irradiation at baseline and the 3 visits. Models were scanned with a CAD/CAM scanner (Planmeca, Helsinki, Finland).
Canine retraction was significantly greater (1.60 ± 0.38 mm) on the experimental side compared with the placebo side (0.79 ± 0.35 mm) (P <0.05). Pain was significantly less on the experimental side only on the first day after application of LLLI and at the second visit (1.4 ± 0.82 and 1.4 ± 0.64) compared with the placebo sides (2.2 ± 0.41 and 2.4 ± 1.53).
Low-level laser irradiation applied at 3-week intervals can accelerate orthodontic tooth movement and reduce the pain associated with it.
本研究旨在评估每隔3周进行一次低强度激光照射对使用自锁托槽的正畸牙齿移动及与正畸牙齿移动相关疼痛的影响。
本双盲临床试验招募了22例安氏II类1分类错牙合患者（男11例，女11例；平均年龄19.8±3.1岁），他们均需要双侧拔除上颌第一前磨牙。使用自锁托槽（SmartClip SL3；3M Unitek，明尼苏达州圣保罗）进行排齐整平后，在0.019×0.025英寸的不锈钢弓丝上使用6毫米镍钛闭合曲弹簧双侧施加150克力内收尖牙。在试验侧尖牙根周围的颊侧和腭侧5个点使用波长为940纳米的连续模式镓铝砷二极管激光（iLas；Biolase，加利福尼亚州欧文）照射（能量密度，7.5 J/cm/点；光纤尖端直径，0.04厘米）；另一侧作为对照。在基线时进行激光照射，然后在3周后重复照射，并连续进行另外2次随访。向患者发放基于数字评分量表的问卷，记录他们1周内的疼痛强度。在基线时以及3次随访中每次照射前进行取模。使用CAD/CAM扫描仪（Planmeca，芬兰赫尔辛基）对模型进行扫描。
试验侧尖牙内收量（1.60±0.38毫米）显著大于对照侧（0.79±0.35毫米）（P<0.05）。仅在低强度激光照射后的第一天和第二次随访时，试验侧的疼痛明显低于对照侧（分别为1.4±0.82和1.4±0.64），对照侧为（2.2±0.41和2.4±1.53）。
每隔3周进行一次低强度激光照射可加速正畸牙齿移动并减轻与之相关的疼痛。
