Eliades Theodore, Eliades George
Clinic of Orthodontics and Pediatric Dentistry, Center for Dental Medicine, University of Zurich, Zurich, Switzerland.
Department of Biomaterials, School of Dentistry, National and Kapodistrian University of Athens, Athens, Greece.
Korean J Orthod. 2024 Jul 25;54(4):199-209. doi: 10.4041/kjod24.085. Epub 2024 Jun 27.
The clinical application of aligners is accompanied by the ageing of the polymer appliances and the attachments used, which may result in inefficiency in reaching the predicted range of tooth movement, and release of compounds and microplastics in the oral cavity as a result of the friction, wear and attrition of the aligner and composite attachment. The purpose of this review is to present the mechanism and effects of ageing; describe the hydrolytic degradation of aligners and enzymatic degradation of composite attachments; examine the ageing pattern of aligners , under actual clinical scenarios; and identify a link to the discrepancy between predicted and actual clinical outcome. Lastly, strategies to deal with three potentially critical issues associated with the use of aligners, namely the necessity of weekly renewal, the dissimilar mechanical properties of aligner and attachment resulting in wear and plastic deformation of the aligner, and the development of integuments and biofilms with microbial colonization of the appliance, are discussed.
隐形矫治器的临床应用伴随着聚合物矫治器及其所用附件的老化，这可能导致在达到预测的牙齿移动范围方面效率低下，并且由于隐形矫治器与复合附件之间的摩擦、磨损和损耗，会在口腔中释放化合物和微塑料。本综述的目的是阐述老化的机制和影响；描述隐形矫治器的水解降解和复合附件的酶解降解；研究实际临床场景下隐形矫治器的老化模式；并确定与预测临床结果和实际临床结果之间差异的关联。最后，讨论了应对与使用隐形矫治器相关的三个潜在关键问题的策略，即每周更换的必要性、隐形矫治器和附件不同的机械性能导致矫治器磨损和塑性变形，以及矫治器表面形成有微生物定植的被膜和生物膜。
