Department of Biomaterials, School of Dentistry, National and Kapodistrian University of Athens, 2 Thivon Str, Goudi, 115 27, Athens, Greece.
Department of Prosthodontics, School of Dentistry, National and Kapodistrian University of Athens, 2 Thivon Str, Goudi, 115 27, Athens, Greece.
J Mech Behav Biomed Mater. 2021 Nov;123:104757. doi: 10.1016/j.jmbbm.2021.104757. Epub 2021 Aug 4.
The aim of the study was to evaluate the degree of conversion and the mechanical properties of five composite core build-up materials polymerized in dual-curing and self-curing modes. The materials tested were: Clearfil DC Core Plus (CF), Gradia Core (GC), Luxacore-Z Dual Smartmix (LX), Multicore Flow (MC) and Paracore (PC). Disk-shaped specimens were prepared from each material; half the specimens were light-cured, whereas the rest were only self-cured. After a 3-week storage period (dark/dry/37 °C) the Martens Hardness, Indentation Modulus, and Elastic Index were determined by instrumented indentation testing (IIT), while the degree of conversion was assessed by ATR-FTIR spectroscopy. Statistical analysis was performed by 2-way ANOVA and post-hoc testing (α = 0.05). The dual-curing mode resulted in statistically higher Martens Hardness and Elastic Index than the self-curing mode in most materials but showed insignificant differences in Indentation Modulus. MC and PC demonstrated significantly higher degree of conversion in both curing modes. Overall, the self-curing mode was inferior to the dual-curing in conversion and mechanical properties for most products, despite their differences in monomer composition and filler loading.
本研究旨在评估五种复合树脂核材料在双重固化和自固化模式下的聚合转化率和机械性能。测试的材料有：Clearfil DC Core Plus（CF）、Gradia Core（GC）、Luxacore-Z Dual Smartmix（LX）、Multicore Flow（MC）和 Paracore（PC）。从每种材料中制备出圆盘状试件；一半试件进行光固化，另一半仅进行自固化。经过 3 周的储存期（黑暗/干燥/37°C）后，通过仪器压痕测试（IIT）测定马氏硬度、压痕模量和弹性指数，通过 ATR-FTIR 光谱评估聚合转化率。采用双因素方差分析和事后检验（α=0.05）进行统计分析。在大多数材料中，双重固化模式下的马氏硬度和弹性指数均显著高于自固化模式，但压痕模量无显著差异。MC 和 PC 在两种固化模式下均表现出较高的聚合转化率。总体而言，尽管单体组成和填料负载存在差异，但对于大多数产品而言，自固化模式在转化率和机械性能方面均劣于双重固化模式。
