Oxygen Inhibition of Surface Composites and Its Correlation with Degree of Conversion and Color Stability

Abstract This study investigated the effects of oxygen inhibition and finishing/polishing procedures on the composite resin properties. One bulk-fill and two conventional composite resins (nanoparticle and microhybrid) were evaluated. Specimens were prepared using 4 surface treatments: control, no treatment; Gly, oxygen inhibition with glycerin; FP, finishing and polishing; Gly + FP, glycerin followed by finishing and polishing. The degree of conversion (DC) was measured using Fourier Transformed Infrared Spectroscopy (FTIR) immediately and after 15 days (n=5). Color stability (ΔEab, and ΔE00) and opacity were evaluated using a spectrophotometer after 15 days of immersion in coffee, using the CIELAB system (n=5). Data were analyzed by two-way ANOVA and Tukey tests (α=0.05) and opacity by two-way repeated-measures ANOVA. Glycerin usage increased significantly the DC however had no influence on the ΔEab, ΔE00 and, opacity values. Finishing and polishing reduced ΔEab and ΔE00 values, regardless of composite resins. Microhybrid showed higher opacity, followed by the nanoparticle and bulk fill, regardless of surface treatment. Post-polymerization polishing procedures resulted in lower conversion than using an oxygen inhibitor agent (Gly condition), but similar staining caused by coffee.

摘要 本研究探究了氧阻聚与修整/抛光工艺对复合树脂性能的影响。本次实验评估了1种大块充填型复合树脂（bulk-fill）及2种传统复合树脂，分别为纳米颗粒型与微混合型复合树脂。试样按4种表面处理方案制备：对照组（无任何处理）；Gly组（采用甘油实施氧阻聚）；FP组（进行修整与抛光）；Gly+FP组（先经甘油处理，再行修整与抛光）。转化率（degree of conversion, DC）采用傅里叶变换红外光谱（Fourier Transformed Infrared Spectroscopy, FTIR）分别在试样制备即刻及15天后检测，每组样本量n=5。将试样在咖啡中浸泡15天后，采用分光光度计结合CIELAB颜色系统评估其颜色稳定性（ΔEab、ΔE00）与不透明度，每组样本量n=5。数据采用双因素方差分析（two-way ANOVA）与Tukey检验进行统计学分析，检验水准α=0.05；不透明度数据则采用双因素重复测量方差分析。使用甘油可显著提升转化率，但对ΔEab、ΔE00及不透明度值无显著影响。无论使用何种复合树脂，修整与抛光均可降低ΔEab与ΔE00值。无论采用何种表面处理方案，微混合型复合树脂的不透明度最高，其次为纳米颗粒型，最后为大块充填型。聚合后抛光工艺的转化率低于氧阻聚剂处理组（Gly组），但咖啡诱导的着色程度与Gly组无显著差异。