Hashemikamangar Sedighe Sadat, Merati Hamid, Valizadeh Sara, Saberi Sogol
Dental Research Center, Dentistry Research Institute, Tehran University of Medical Sciences, Tehran, Iran.
Restorative department, Dental School, Tehran University of Medical Sciences, Tehran, Iran.
Front Dent. 2024 Jul 22;21:27. doi: 10.18502/fid.v21i27.16142. eCollection 2024.
This study assessed the effects of blue and Er:YAG lasers, fluoride varnish, and their combination on microhardness, and calcium and phosphorus content of demineralized enamel. The primary Vickers microhardness of 28 third molars was measured and their enamel calcium and phosphorous content was quantified by energy-dispersive X-ray spectroscopy. They were then randomly assigned to five groups of 5% sodium fluoride (NaF) varnish, 445nm blue laser, Er:YAG laser, 5% NaF + 445nm blue laser, and 5% NaF + Er:YAG laser. The teeth then underwent pH-cycling to induce caries-like lesions. The surface microhardness of the teeth and the calcium and phosphorous content of demineralized enamel were measured again. Data were analyzed by one-way ANOVA and Tukey's test (alpha=0.05). NaF, NaF-diode laser, and NaF-Er:YAG laser groups experienced a significant increase in microhardness of demineralized enamel close to the baseline value (P<0.05). The efficacy of NaF-blue laser and NaF-Er:YAG laser was higher than NaF . In blue and Er:YAG laser groups, the mean final microhardness was significantly lower than the baseline microhardness. The percentage of phosphorus in all groups was similar to that of sound enamel. The percentage of calcium in NaF group was significantly lower than that of sound enamel and all other groups. The calcium content in other groups was similar to that of sound enamel. Fluoride varnish had a synergistic effect with Er:YAG and blue lasers to increase the demineralized enamel microhardness; blue and Er:YAG lasers alone were less effective.
本研究评估了蓝光和铒钇铝石榴石（Er:YAG）激光、含氟涂料及其组合对脱矿釉质的显微硬度、钙和磷含量的影响。测量了28颗第三磨牙的初始维氏显微硬度，并通过能量色散X射线光谱法定量其釉质钙和磷含量。然后将它们随机分为五组，分别接受5%氟化钠（NaF）含氟涂料、445nm蓝光激光、Er:YAG激光、5%NaF + 445nm蓝光激光以及5%NaF + Er:YAG激光处理。随后对牙齿进行pH循环以诱导龋样病变。再次测量牙齿的表面显微硬度以及脱矿釉质的钙和磷含量。数据采用单因素方差分析和Tukey检验进行分析（α = 0.05）。NaF组、NaF - 二极管激光组和NaF - Er:YAG激光组脱矿釉质的显微硬度显著增加，接近基线值（P<0.05）。NaF - 蓝光激光组和NaF - Er:YAG激光组的疗效高于NaF组。在蓝光和Er:YAG激光组中，最终平均显微硬度显著低于基线显微硬度。所有组中磷的百分比与健康釉质相似。NaF组中钙的百分比显著低于健康釉质及所有其他组。其他组中的钙含量与健康釉质相似。含氟涂料与Er:YAG激光和蓝光激光具有协同作用，可提高脱矿釉质的显微硬度；单独使用蓝光和Er:YAG激光效果较差。
