Garcez Aguinaldo S, Suzuki Selly Sayuri, Martinez Elisabeth Ferreira, Iemini Mylene Garcez, Suzuki Hideo
São Leopoldo Mandic Dental Research Center, Campinas, SP, Brazil,
Lasers Med Sci. 2015 Feb;30(2):727-32. doi: 10.1007/s10103-013-1367-5. Epub 2013 Aug 9.
The success rate of miniscrews when used as temporary orthodontic anchorage is relatively high, but some factors could affect its clinical success such as inflammation around the miniscrew. Low-intensity laser therapy has been widely used for biostimulation of tissue and wound healing specially for its anti-inflammatory effects. The purpose of this study was to evaluate the effect of low-intensity laser therapy over the miniscrew success rate. Five Landrace's pigs received 50 miniscrews on the buccal side of the mandible and on the palate of the maxilla. All the miniscrews were immediately loaded with 250 gf. The laser group were irradiated with a 780-nm diode laser with 70 mWs for 1 min (dose = 34 J/cm(2)); the contralateral side was used as the control group. The miniscrews were photographed and analyzed clinically every week to determine their stability and presence of local inflammation. After 3 weeks, histological analysis and fluorescent microscopy were performed to compare the laser and the control side. Clinical results showed a success rate of 60% for the control group and 80% for the laser-treated group. The histological analysis and fluorescent microscopy demonstrated that the laser group had less inflammatory cells than the control group and the bone neoformation around the miniscrew was more intense. Low-intensity laser therapy increased the success rate of orthodontic miniscrews, probably due to anti-inflammatory effect and bone stimulation.
微型螺钉作为临时正畸支抗使用时成功率相对较高，但一些因素可能会影响其临床成功率，比如微型螺钉周围的炎症。低强度激光疗法已被广泛用于组织的生物刺激和伤口愈合，特别是因其抗炎作用。本研究的目的是评估低强度激光疗法对微型螺钉成功率的影响。五只长白猪在下颌颊侧和上颌腭部植入50颗微型螺钉。所有微型螺钉均立即加载250克力。激光组用波长780纳米、功率70毫瓦的二极管激光照射1分钟（剂量=34焦/平方厘米）；对侧作为对照组。每周对微型螺钉进行拍照并进行临床分析，以确定其稳定性和局部炎症情况。3周后，进行组织学分析和荧光显微镜检查，以比较激光侧和对照侧。临床结果显示，对照组成功率为60%，激光治疗组为80%。组织学分析和荧光显微镜检查表明，激光组的炎性细胞比对照组少，微型螺钉周围的骨新生更明显。低强度激光疗法提高了正畸微型螺钉的成功率，可能是由于其抗炎作用和对骨的刺激作用。
