Shimojima Mika, Hiraishi Noriko, Akabane Kodai, Nassar Mohannad, Otsuki Masayuki, Shimada Yasushi
Department of Cariology and Operative Dentistry, Tokyo Medical and Dental University, Tokyo 113-8549, Japan.
Department of Preventive and Restorative Dentistry, College of Dental Medicine, University of Sharjah, Sharjah P.O. Box 27272, United Arab Emirates.
J Funct Biomater. 2023 Jul 21;14(7):386. doi: 10.3390/jfb14070386.
In-office bleaching with high concentrations of hydrogen peroxide (HO) agents causes undesirable alterations in the enamel. Surface pre-reacted glass-ionomer (S-PRG) filler is a functional material known for its acid-neutralizing and demineralization-inhibition properties. This study evaluates the effect of S-PRG filler incorporation in HO-based bleaching on the enamel surface. Bovine enamel surfaces were bleached using a bleaching paste formulated with a liquid (35% HO) and a powder containing 5% or 10% S-PRG filler. The surface roughness and the Vickers microhardness of the treated enamel surfaces were evaluated. The enamel surfaces were observed under a scanning electron microscope (SEM) and analyzed using energy dispersive X-ray (EDX) technology. The surfaces were challenged by citric acid and observed by SEM. The specimens bleached with the paste containing the S-PRG filler showed lower enamel surface roughness and higher microhardness values than did those bleached with the plain paste (0% S-PRG filler); meanwhile, there were no significant differences between the 5% or 10% S-PRG filler groups. The S-PRG filler groups showed enamel surface morphologies similar to those of the non-bleached enamel, according to SEM observation, and EDX analysis detected the presence of fluoride and strontium ions. The S-PRG filler groups showed a higher resistance to erosion. The S-PRG filler mitigated the detrimental effects of bleaching agents on the enamel surface and provided resistance to erosion.
使用高浓度过氧化氢（HO）制剂进行诊室牙齿美白会导致牙釉质出现不良改变。表面预反应玻璃离子（S-PRG）填料是一种功能性材料，以其酸中和及抑制脱矿特性而闻名。本研究评估了在基于HO的牙齿美白中加入S-PRG填料对牙釉质表面的影响。使用由液体（35% HO）和含有5%或10% S-PRG填料的粉末配制的美白糊剂对牛牙釉质表面进行美白。评估处理后牙釉质表面的粗糙度和维氏显微硬度。在扫描电子显微镜（SEM）下观察牙釉质表面，并使用能量色散X射线（EDX）技术进行分析。用柠檬酸对表面进行侵蚀试验，并通过SEM观察。与用普通糊剂（0% S-PRG填料）美白的标本相比，用含有S-PRG填料的糊剂美白的标本显示出牙釉质表面粗糙度更低，显微硬度值更高；同时，5%或10% S-PRG填料组之间没有显著差异。根据SEM观察，S-PRG填料组显示出牙釉质表面形态与未美白牙釉质相似，并且EDX分析检测到氟离子和锶离子的存在。S-PRG填料组显示出更高的抗侵蚀性。S-PRG填料减轻了美白剂对牙釉质表面的有害影响，并提供了抗侵蚀能力。
