Abohabib Ahmed Mohamed, Fayed Mona Mohamed, Labib Amr H
a Faculty of Dentistry , Kafrelsheikh University , Karfelskeikh , Egypt.
b Department of Orthodontics, Faculty of Dentistry , Cairo University , Cairo , Egypt.
J Orthod. 2018 Sep;45(3):149-156. doi: 10.1080/14653125.2018.1481710. Epub 2018 Jun 6.
To investigate the effect of low-intensity laser therapy on mini-implant stability using resonance frequency analysis during canine retraction with fixed appliances.
A split-mouth randomised clinical trial.
Subjects were recruited and treated in the outpatient clinic, Department of Orthodontics, Faculty of Dentistry, Cairo University.
Fifteen subjects with mean age 20.9 (±3.4) years who required extraction of maxillary first premolar teeth and mini-implant-supported canine retraction.
Thirty orthodontic mini-implants were inserted bilaterally in the maxillary arches of recruited subjects following alignment and levelling. Mini-implants were immediately loaded with a force of 150 g using nickel titanium coil springs with split-mouth randomisation to a low-intensity laser-treated side and control side. The experimental sides were exposed to low-intensity laser therapy from a diode laser with a wavelength of 940 nm at (0, 7, 14, 21 days) after mini-implant placement. Mini-implant stability was measured using resonance frequency analysis at (0, 1, 2, 3, 4, 6, 8, 10 weeks) after implant placement.
A total sample of 28 mini-implants were investigated with 14 in each group. Clinically, both mini-implant groups had the same overall success rate of 78.5%. There were no significant differences in resonance frequency scores between low-intensity laser and control sides from baseline to week 2. However, from week 3 to 10, the low-intensity laser sides showed significantly increased mean resonance frequency values compared to control (P > 0.05).
Despite evidence of some significant differences in resonance frequency between mini-implants exposed to low-intensity laser light over a 10 weeks period there were no differences in mini-implant stability. Low-intensity laser light cannot be recommended as a clinically useful adjunct to promoting mini-implant stability during canine retraction.
利用共振频率分析，研究低强度激光治疗对使用固定矫治器内收犬牙期间微型种植体稳定性的影响。
一项双侧对照随机临床试验。
研究对象在开罗大学牙科学院正畸科门诊招募并接受治疗。
15名平均年龄20.9（±3.4）岁的研究对象，他们需要拔除上颌第一前磨牙并采用微型种植体支抗内收犬牙。
在纳入研究的对象排齐整平上颌牙弓后，在上颌双侧植入30枚正畸微型种植体。微型种植体立即使用镍钛拉簧加载150 g的力，并通过双侧对照随机分配至低强度激光治疗侧和对照侧。在微型种植体植入后第（0、7、14、21）天，对试验侧使用波长940 nm的二极管激光进行低强度激光治疗。在种植体植入后第（0、1、2、3、4、6、8、10）周，采用共振频率分析测量微型种植体的稳定性。
共研究28枚微型种植体，每组14枚。临床上，两组微型种植体的总体成功率均为78.5%。从基线至第2周，低强度激光治疗侧与对照侧的共振频率评分无显著差异。然而，从第3周直至第10周，与对照组相比，低强度激光治疗侧的平均共振频率值显著增加（P > 0.05）。
尽管有证据表明在10周的时间里，接受低强度激光照射的微型种植体在共振频率上存在一些显著差异，但微型种植体的稳定性并无差异。在犬牙内收过程中，不推荐将低强度激光作为促进微型种植体稳定性的临床辅助手段。
