School of Materials Science and Engineering, Nanjing University of Science and Technology, Nanjing, 210094, Jiangsu, China.
Department of Dental Materials & Dental Medical Devices Testing Center, Peking University School and Hospital of Stomatology, Beijing, 100081, China.
Nat Commun. 2022 Jul 29;13(1):4419. doi: 10.1038/s41467-022-32132-3.
Tooth whitening has recently become one of the most popular aesthetic dentistry procedures. Beyond classic hydrogen peroxide-based whitening agents, photo-catalysts and piezo-catalysts have been demonstrated for non-destructive on-demand tooth whitening. However, their usage has been challenged due to the relatively limited physical stimuli of light irradiation and ultrasonic mechanical vibration. To address this challenge, we report here a non-destructive and convenient tooth whitening strategy based on the pyro-catalysis effect, realized via ubiquitous oral motion-induced temperature fluctuations. Degradation of organic dyes via pyro-catalysis is performed under cooling/heating cycling to simulate natural temperature fluctuations associated with intake and speech. Teeth stained by habitual beverages and flavorings can be whitened by the pyroelectric particles-embedded hydrogel under a small surrounding temperature fluctuation. Furthermore, the pyro-catalysis-based tooth whitening procedure exhibits a therapeutic biosafety and sustainability. In view of the exemplary demonstration, the most prevalent oral temperature fluctuation will enable the pyro-catalysis-based tooth whitening strategy to have tremendous potential for practical applications.
牙齿美白最近已成为最受欢迎的美容牙科治疗手段之一。除了经典的基于过氧化氢的美白剂外，光催化剂和压电催化剂已被证明可用于非破坏性按需牙齿美白。然而，由于光辐照和超声机械振动的相对有限的物理刺激，它们的使用受到了挑战。为了解决这一挑战，我们在此报告了一种基于热催化效应的非破坏性和便捷的牙齿美白策略，该策略通过普遍存在的口腔运动引起的温度波动来实现。通过冷却/加热循环进行有机染料的热催化降解，以模拟与摄入和言语相关的自然温度波动。在小的周围温度波动下，嵌入热释电颗粒的水凝胶可使习惯性饮料和调味料染色的牙齿变白。此外，基于热催化的牙齿美白程序表现出治疗生物安全性和可持续性。鉴于该范例演示，最常见的口腔温度波动将使基于热催化的牙齿美白策略具有巨大的实际应用潜力。
