Department of Operative Dentistry, Faculty of Dentistry, Mansoura University, Mansoura, Egypt,
Department of Operative Dentistry, Faculty of Dentistry, Mansoura University, Mansoura, Egypt.
Am J Dent. 2022 Aug;35(4):185-190.
To evaluate the degree of conversion (DC), Vickers microhardness (VMH), and depth of cure of dual-cure and light-cure bulk-fill resin composites (BFRCs).
One dual-cure (Fill-Up) and two light-cure (QuiXfil and Tetric N-Ceram Bulk Fill) BFRCs were investigated. For each tested BFRC, 11 cylindrical specimens (5 mm diameter, 4 mm height) were prepared, and light cured for 10 seconds (n= 11). DC was obtained by attenuated total reflectance-Fourier transform infrared spectroscopy (ATR-FTIR), and VMH was obtained using a VMH tester. The specimens were measured for DC and VMH at top and bottom surfaces. Statistical analysis was performed using two-way ANOVA, Tukey's post-hoc, and Pearson correlation tests (P< 0.05).
Fill-Up and Tetric N-Ceram Bulk Fill revealed significantly higher DC and VMH values on the top surfaces than that on the bottom surfaces, whereas QuiXfil revealed no significant difference between top and bottom surfaces for DC and VMH. All tested BFRCs showed bottom/top ratios >80% for both DC and VMH. Each tested BFRC showed a significant positive correlation between DC and VMH. All tested BFRCs had adequate depth of cure, but only QuiXfil had a uniform depth of cure. Both DC and VMH bottom/top ratios were effective for depth of cure evaluation.
QuiXfil, Tetric N-Ceram Bulk Fill, and Fill-Up BFRCs were well cured up to a 4 mm depth. Although Fill-Up (dual-cure) can be used with its chemical-curing mode, light curing improved DC and VMH values of the top layer. Distinct variance in DC and VMH among the three tested BFRCs may affect their clinical performance.
评估双固化和光固化块状充填树脂复合材料（BFRC）的转化率（DC）、维氏显微硬度（VMH）和固化深度。
研究了一种双固化（Fill-Up）和两种光固化（QuiXfil 和 Tetric N-Ceram Bulk Fill）BFRC。对于每种测试的 BFRC，制备了 11 个圆柱形试件（直径 5mm，高度 4mm），并进行了 10 秒的光固化（n=11）。通过衰减全反射傅里叶变换红外光谱（ATR-FTIR）获得 DC，通过 VMH 测试仪获得 VMH。在顶部和底部表面测量试件的 DC 和 VMH。使用双向方差分析、Tukey 事后检验和 Pearson 相关检验（P<0.05）进行统计分析。
Fill-Up 和 Tetric N-Ceram Bulk Fill 在顶部表面的 DC 和 VMH 值明显高于底部表面，而 QuiXfil 在 DC 和 VMH 方面顶部和底部表面之间没有显著差异。所有测试的 BFRC 在下/上比值方面均显示出 80%以上的 DC 和 VMH。每种测试的 BFRC 均显示出 DC 和 VMH 之间存在显著的正相关。所有测试的 BFRC 均具有足够的固化深度，但只有 QuiXfil 具有均匀的固化深度。DC 和 VMH 下/上比值均对固化深度评估有效。
QuiXfil、Tetric N-Ceram Bulk Fill 和 Fill-Up BFRC 可在 4mm 深度内充分固化。尽管 Fill-Up（双固化）可以使用其化学固化模式，但光固化可提高顶层的 DC 和 VMH 值。三种测试的 BFRC 之间在 DC 和 VMH 方面的明显差异可能会影响其临床性能。
