Gama Sabrina K C, Habib Fernando A L, Monteiro Juliana S de Carvalho, Paraguassú Gardênia M, Araújo Telma Martins, Cangussú Maria Cristina T, Pinheiro Antonio Luiz B
Centro de Ortodontia e Ortopedia Facial Prof. José Édimo Soares Martins, School of Dentistry, Federal University of Bahia (UFBA), Salvador, BA, Brazil.
Photomed Laser Surg. 2010 Oct;28 Suppl 2:S79-83. doi: 10.1089/pho.2009.2618. Epub 2010 Oct 8.
The aim of this research was to investigate the influence of low-power laser on tooth movement in rats.
Tooth movement is closely related to the process of bone remodeling. The biologic result, with the application of a force to the tooth, is bone absorption on the pressure side and neoformation on the traction side of the alveolar bone. The laser photobiomodulation is capable of providing an increase in cellular metabolism, blood flow, and lymphatic drainage.
Thirty young-adult male Wistar rats weighing between 250 and 300 g were divided into two groups, control and experimental, containing 15 animals each. The animals received orthodontic devices calibrated to release a force of 40 g/F, with the purpose of moving the first upper molar mesially. Low-intensity laser, wavelength 790 nm, was used in the experimental group; the dose was 4.5 J/cm(2) per point, mesial and distal, on the palatal side, 11 J/cm(2) on the buccal side, and this procedure was repeated every 48 h, totaling nine applications. The active movement was clinically evaluated after 7, 13, and 19 days.
The results showed no statistically significant difference, p = 0.079 (T0-T7), p = 0.597 (T7-T13), and p = 0.550 (T13-T19) between the laser and control groups on the amount of tooth movement in the different times evaluated. It may be concluded that laser phototherapy, with the parameters in the present study, did not significantly increase the amount of tooth displacement during induced orthodontic movement in rodents.
本研究旨在探讨低功率激光对大鼠牙齿移动的影响。
牙齿移动与骨重塑过程密切相关。对牙齿施加力后，生物学结果是牙槽骨压力侧骨吸收和牵引侧新骨形成。激光光生物调节能够促进细胞代谢、增加血流量和淋巴引流。
将30只体重在250至300克之间的成年雄性Wistar大鼠分为两组，对照组和实验组，每组15只。给动物佩戴校准后能释放40克力的正畸装置，以使上颌第一磨牙向近中移动。实验组使用波长790纳米的低强度激光；每点剂量为腭侧近中和远中各4.5焦/平方厘米，颊侧为11焦/平方厘米，每48小时重复此操作，共进行9次。在第7、13和19天对主动移动进行临床评估。
结果显示，在评估的不同时间点，激光组和对照组在牙齿移动量上无统计学显著差异，p = 0.079（T0 - T7），p = 0.597（T7 - T13），p = 0.550（T13 - T19）。可以得出结论，在本研究参数下，激光光疗在诱导啮齿动物正畸移动过程中并未显著增加牙齿位移量。
