Godoy Bruno Miranda, Arana-Chavez Victor Elias, Núñez Silvia Cristina, Ribeiro Martha Simões
Professional Master Lasers in Dentistry, IPEN-CNEN/SP, São Paulo, Brazil.
Arch Oral Biol. 2007 Sep;52(9):899-903. doi: 10.1016/j.archoralbio.2007.02.003. Epub 2007 May 7.
Studies on the influence of low-power red laser on the repair of dental structures are very scarce. This study investigated the effects of the laser therapy on the ultrastructure of the dentine-pulp interface after conservative class I cavity preparation.
Two female volunteers with 8 premolars indicated for extraction for orthodontic reasons were recruited. Class I cavities were prepared and the teeth were randomly divided into two groups. The first group received treatment with a GaA1As laser, lambda=660nm, power of 30mW and energy dose of 2J/cm(2), directly and perpendicularly into the cavity in a single visit. After the irradiation, the cavities were filled with composite resin. The second group received the same treatment, except by the laser therapy.
Twenty-eight days post-preparation, the teeth were extracted and processed for transmission electron microscopy analysis. Two sound teeth, without cavity preparation, were also studied. The irradiated group presented odontoblast process in higher contact with the extracellular matrix and the collagen fibrils appeared more aggregated and organised than those of control group. These results were also observed in the healthy teeth.
These findings suggest that laser irradiation accelerates the recovery of the dental structures involved in the cavity preparation at the predentine region.
关于低功率红色激光对牙齿结构修复影响的研究非常稀少。本研究调查了激光治疗对I类洞保守性制备后牙本质-牙髓界面超微结构的影响。
招募了两名因正畸原因需要拔除8颗前磨牙的女性志愿者。制备I类洞，并将牙齿随机分为两组。第一组接受GaA1As激光治疗，波长λ=660nm，功率30mW，能量剂量2J/cm²，在单次就诊时直接垂直照射到洞中。照射后，用复合树脂填充洞。第二组接受相同治疗，但不进行激光治疗。
制备后28天，拔除牙齿并进行透射电子显微镜分析。还研究了两颗未制备洞的健康牙齿。照射组的成牙本质细胞突起与细胞外基质的接触更多，胶原纤维比对照组更聚集且排列更有序。在健康牙齿中也观察到了这些结果。
这些发现表明，激光照射可加速前期牙本质区域参与洞制备的牙齿结构的恢复。
