目的:本研究旨在评估含不同含量45S5生物活性玻璃(BAG)的30%过氧化氢(HP)溶液在模拟临床漂白程序后对美白功效和牙釉质表面特性的影响。
方法:将60个红茶变色的牛牙釉质标本分为5组,用蒸馏水处理,HP,0.01重量。%BAG+生命,1.0重量。%BAG+生命,和20.0wt。%BAG+HP(n=12)。在混合实验溶液后立即观察pH变化20分钟,每周20分钟,在37°C超过21天。颜色,光泽,粗糙度,显微硬度,在漂白处理前后进行微观形态测量。
结果:所有含BAG的组的pH值在不到1分钟内从3.5增加到5.5,并且最终pH随着BAG含量的增加而增加。各实验组的ΔE均显著高于DW组(p<0.05),但不同BAG含量之间无显著差异(p>0.05)。与DW组相比,所有实验组的光泽度均显着降低,BAG含量的增加对光泽的降低有显著影响(p<0.05)。表面粗糙度无统计学差异(p>0.05),但硬度随漂白处理后BAG含量的增加而显著增加(p<0.05)。
结论:含45S5BAG的HP显示出牙齿美白功效。此外,HP的pH值保持酸性接近3.5持续20分钟,而含有45S5BAG的HP显示pH增加,抑制了牙釉质表面的去矿化,并保持了表面形态。
结论:这些新型材料是有希望的候选材料,可最大程度地减少牙科诊所漂白过程中HP引起的牙釉质表面损伤。
OBJECTIVE: This study aimed to evaluate the effects of 30% hydrogen peroxide (HP) solution containing various contents of 45S5 bioactive glass (BAG) on whitening efficacy and enamel surface properties after simulating the clinical bleaching procedure.
METHODS: A total of 60 bovine enamel specimens discolored with black tea were divided into five groups treated with distilled water (DW), HP, 0.01 wt.% BAG + HP, 1.0 wt.% BAG + HP, and 20.0 wt.% BAG + HP (n = 12). The pH change was observed for 20 min immediately after mixing the experimental solutions, which were applied for 20 min/week, at 37 °C over 21 days. Color, gloss, roughness, microhardness, and micromorphology measurements were conducted before and after bleaching treatment.
RESULTS: All groups containing BAG experienced an increase in pH from 3.5 to 5.5 in less than 1 min, and the final pH increased as the BAG content increased. The ΔE of all experimental groups was significantly higher than that of the DW group (p < 0.05), but there were no significant differences between different BAG contents (p > 0.05). Gloss significantly decreased in all experimental groups compared to the DW group, and the increased BAG content had significantly affected the decrease in gloss (p < 0.05). There was no statistical difference in surface roughness (p > 0.05), but hardness increased significantly with BAG content after bleaching treatment (p < 0.05).
CONCLUSIONS: HP containing 45S5 BAG showed efficacy in tooth whitening. Also, the pH value of the HP remained acidic near 3.5 for 20 min, while the HP containing the 45S5 BAG showed an increase in pH, which inhibited the demineralization of the enamel surface, and maintained the surface morphology.
CONCLUSIONS: These novel materials are promising candidates to minimize enamel surface damage caused by HP during bleaching procedure in dental clinic.