Amirinejad Sahar, Panahandeh Narges, Torabzadeh Hassan
Department of Restorative Dentistry, Dental Research Center, Research Institute of Dental Sciences, School of Dentistry, Shahid Beheshti University of Medical Sciences, Tehran, Iran.
Int J Dent. 2025 Jul 30;2025:3702687. doi: 10.1155/ijod/3702687. eCollection 2025.
This study assessed the degree of conversion (DC), color, and dimensional stability, of three composite resins early after curing. This study was conducted on X-tra fil, Filtek Z250, and Filtek Ultimate composites. To measure DC, the absorption spectra of composites before and after curing (immediately, 15 min, 2 h, 6 and 24 h, 1 week, and 1 month) were recorded by ATR-FTIR. Fifteen specimens were fabricated for each composite and assigned to two experimental groups (15 min immersion in coffee immediately and 2 h after curing) and a control. The CIE color parameters of each specimen and color change () were measured at the aforementioned time points. Dimensional changes were measured by a digital micrometer. Respective ANOVA and Tukey tests were used for analysis. < 0.05 was considered significant. All composites exhibited an increased DC and expansion over time ( < 0.001). At 1 month, the of composites immersed in coffee after 2 h was not significantly from the control group. In the immediate coffee immersion group, X-tra fil experienced significantly greater than Filtek Ultimate ( = 0.02). No other significant differences were found. Time of exposure to coffee after curing had a significant effect on the color stability of X-tra fil only. X-tra fil showed minimum dimensional changes after 1 month.
本研究评估了三种复合树脂固化后早期的转化率（DC）、颜色和尺寸稳定性。本研究针对X-tra fil、Filtek Z250和Filtek Ultimate复合树脂展开。为测量DC，通过衰减全反射傅里叶变换红外光谱（ATR-FTIR）记录各复合树脂固化前及固化后（即刻、15分钟、2小时、6小时、24小时、1周和1个月）的吸收光谱。每种复合树脂制备15个样本，并分为两个实验组（分别在固化后即刻和2小时后在咖啡中浸泡15分钟）以及一个对照组。在上述时间点测量每个样本的CIE颜色参数和颜色变化（）。尺寸变化通过数字千分尺测量。分别采用方差分析（ANOVA）和Tukey检验进行分析。P < 0.05被视为具有显著性。所有复合树脂的DC均随时间增加且发生膨胀（P < 0.001）。1个月时，2小时后浸泡在咖啡中的复合树脂的颜色变化与对照组无显著差异。在即刻浸泡咖啡组中，X-tra fil的颜色变化显著大于Filtek Ultimate（P = 0.02）。未发现其他显著差异。固化后接触咖啡的时间仅对X-tra fil的颜色稳定性有显著影响。1个月后X-tra fil的尺寸变化最小。
