In this paper, we study the optimal photoinitiator (camphorquinone, CQ) concentration for light-cured dental resins by combining such properties as the degree of conversion, mechanical properties, and curing depth (the depth at which the hardness is 80% of the surface hardness). The material properties of the light-cured dental resins (Bis-GMA/TEGDMA in a mass ratio of 70:30) are characterized by in-situ near-infrared (NIR) spectroscopy and nanoindentation tests. Experimental results indicate that the degree of conversion (DC) and mechanical properties such as elastic modulus and hardness increase, while the curing depth decreases with the increase of CQ concentration. However, above a certain concentration (~0.5 wt%), these properties do not benefit from the further increasing CQ concentration because of potential self-annihilation between free radicals. The presented study offers a method to determine the optimal photoinitiator concentration for light-cured resins and establishes the correlations between the photoinitiators, polymerization kinetics, and mechanical properties of the light-cured resins.

在本文中，我们通过结合转化率，机械性能和固化深度（硬度为表面硬度的80％的深度）等特性，研究了光固化牙科树脂的最佳光引发剂（樟脑醌，CQ）浓度。硬度）。光固化牙科树脂（Bis-GMA / TEGDMA的质量比为70:30）的材料特性通过原位近红外（NIR）光谱和纳米压痕测试进行表征。实验结果表明，随着CQ的升高，转化率（DC）和力学性能如弹性模量和硬度均增大，固化深度减小。浓度。但是，超过一定浓度（〜0.5 wt％）时，由于自由基之间可能的自self灭，这些性质无法从CQ浓度的进一步提高中受益。提出的研究提供了一种确定光固化树脂的最佳光引发剂浓度的方法，并建立了光引发树脂的光引发剂，聚合动力学和机械性能之间的相关性。