Enhancing photopolymerization and modeling kinetic degradation in dental composites

IF 2.6 4区化学 Q3 POLYMER SCIENCE

Journal of Polymer Research Pub Date : 2024-09-04 DOI:10.1007/s10965-024-04116-y

Rayenne Latoui, Djallel Bouzid, Mohamed-afif Belhani, Olivier Boyron

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Abstract

This study aims to optimize the photopolymerization process of a dental composite in order to increase the degree of conversion and reduce the release of unpolymerized monomers. In addition, it seeks to understand the kinetics of composite degradation under various oral environmental conditions. Optimization of the photopolymerization process is carried out using a Box-Behnken design, exploring factors such as irradiation time, intensity and distance. Infrared spectroscopy is used to evaluate photopolymerization parameters. Release of unpolymerized monomers is quantified using liquid chromatography at different pH levels, incubation media and time. Thermogravimetric analysis is used to study thermal degradation and establish a kinetic model. Optimized conditions for photopolymerization, determined as an irradiation time of 40 s, an intensity of 1500 mW cm⁻², and a distance of 5 mm, lead to a degree of conversion of 61%, reducing the presence of unpolymerized monomers. Chromatographic analysis reveals a pH-dependent release of monomers, with acid saliva showing the highest release. Thermal analysis indicates variable activation energy values depending on ageing conditions, underlining the importance of optimal conversion for increased material strength. This study offers a comprehensive approach to improving the properties of dental resins, and provides optimized conditions for light-curing that increase material strength.

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增强牙科复合材料的光聚合度并建立动力学降解模型

本研究旨在优化牙科复合材料的光聚合工艺，以提高转化率并减少未聚合单体的释放。此外，本研究还试图了解复合材料在各种口腔环境条件下的降解动力学。采用方框-贝肯设计法对光聚合过程进行优化，探索辐照时间、强度和距离等因素。红外光谱法用于评估光聚合参数。在不同的 pH 值、培养基和时间条件下，使用液相色谱法对未聚合单体的释放进行量化。热重分析用于研究热降解并建立动力学模型。光聚合的优化条件为照射时间 40 秒、强度 1500 mW cm-2 和距离 5 mm，光聚合的转化率为 61%，减少了未聚合单体的存在。色谱分析显示，单体的释放与 pH 值有关，酸性唾液的释放量最高。热分析表明，不同的老化条件会产生不同的活化能值，这强调了最佳转化率对提高材料强度的重要性。这项研究为改善牙科树脂的性能提供了一种全面的方法，并为提高材料强度的光固化提供了优化条件。

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来源期刊

Journal of Polymer Research 化学-高分子科学

CiteScore

4.70

自引率

7.10%

发文量

472

审稿时长

3.6 months

期刊介绍： Journal of Polymer Research provides a forum for the prompt publication of articles concerning the fundamental and applied research of polymers. Its great feature lies in the diversity of content which it encompasses, drawing together results from all aspects of polymer science and technology. As polymer research is rapidly growing around the globe, the aim of this journal is to establish itself as a significant information tool not only for the international polymer researchers in academia but also for those working in industry. The scope of the journal covers a wide range of the highly interdisciplinary field of polymer science and technology, including: polymer synthesis; polymer reactions; polymerization kinetics; polymer physics; morphology; structure-property relationships; polymer analysis and characterization; physical and mechanical properties; electrical and optical properties; polymer processing and rheology; application of polymers; supramolecular science of polymers; polymer composites.