Yassaei Soghra, Motallaei Mohammad Nima
Department of Orthodontics, Faculty of Dentistry, Shahid Sadoughi University of Medical Sciences, Yazd, Iran.
Research Center of Prevention and Epidemiology of Non-communicable Disease, Shahid Sadoughi University of Medical Sciences, Yazd, Iran.
J Lasers Med Sci. 2020 Winter;11(1):50-55. doi: 10.15171/jlms.2020.09. Epub 2020 Jan 18.
White spot lesions (WSLs) occurring after orthodontic treatment lead to patient dissatisfaction and aesthetic problems. The role of calcium-phosphate demineralization systems and the Er:YAG laser in the treatment of these lesions has recently been taken into account. This study aimed to investigate the effect of the Er:YAG laser and MI Paste Plus on the treatment of WSLs. A total of 65 premolars extracted due to orthodontic treatment were studied in this research. To create enamel lesions, the teeth were placed in a demineralizing solution. The teeth were then randomly divided into five groups (n=13) as follows: first group, control; second group, saliva; third group, MI Paste Plus; fourth group, Er:YAG laser; and fifth group, MI Paste Plus together with the Er:YAG laser. The teeth were kept in artificial saliva between treatment processes. Artificial saliva was replaced daily with fresh artificial saliva. The teeth were sectioned longitudinally by a disc from the middle of the exposed enamel and each section was mounted in polyester resin. The surface of the samples was serially polished and the microhardness of the teeth was measured at depths of 0, 50, 100, and 150 µm. The microhardness was significantly higher in the fifth group than other groups at depths of 50 and 150 µm ( <0.005). Using the laser or MI Paste Plus alone did not significantly increase the microhardness. The combined application of the Er:YAG laser and MI Paste Plus is effective in the treatment of WSLs.
正畸治疗后出现的白斑病变（WSLs）会导致患者不满和美观问题。磷酸钙脱矿系统和铒钇铝石榴石（Er:YAG）激光在这些病变治疗中的作用最近已被考虑。本研究旨在探讨Er:YAG激光和MI Paste Plus对WSLs的治疗效果。本研究共纳入65颗因正畸治疗而拔除的前磨牙。为制造釉质病变，将牙齿置于脱矿溶液中。然后将牙齿随机分为五组（n = 13）：第一组为对照组；第二组为唾液组；第三组为MI Paste Plus组；第四组为Er:YAG激光组；第五组为MI Paste Plus联合Er:YAG激光组。在治疗过程中，将牙齿保存在人工唾液中。每天用新鲜的人工唾液替换人工唾液。用圆盘从暴露釉质的中间纵向切割牙齿，将每个切片安装在聚酯树脂中。对样品表面进行连续抛光，并在0、50、100和150 µm深度处测量牙齿的显微硬度。在50和150 µm深度处，第五组的显微硬度显著高于其他组（<0.005）。单独使用激光或MI Paste Plus并没有显著提高显微硬度。Er:YAG激光和MI Paste Plus联合应用对WSLs的治疗有效。
