Musella Gennaro, Cantore Stefania, Bizzoca Maria Eleonora, Dioguardi Mario, Intini Rossella, Lo Muzio Lorenzo, Moramarco Federico, Pettini Francesco, Ballini Andrea
Department of Clinical and Experimental Medicine, University of Foggia, 71122 Foggia, Italy.
Department of Mechanics, Mathematics and Management, Polytechnic University of Bari, 70125 Bari, Italy.
Dent J (Basel). 2025 Aug 1;13(8):352. doi: 10.3390/dj13080352.
This study aimed to investigate the influence of shade and thickness on the polymerization of SDR flow+, a low-viscosity bulk-fill composite, by assessing its degree of conversion (DC). An in vitro study was conducted using SDR flow+ composite resin. Specimens were prepared at two thicknesses (2 mm and 4 mm) and four shades (Universal, A1, A2, A3). Polymerization was performed using a high-intensity LED curing unit. The DC was assessed using Fourier-transform infrared spectroscopy (ATR-FTIR). Both shade and thickness significantly influenced DC. Thicker specimens (4 mm) exhibited reduced polymerization compared to thinner specimens (2 mm). Darker shades, particularly A3, demonstrated the lowest DC values due to their higher chroma, which limits light penetration. In contrast, the Universal shade achieved higher DC values, even at increased depths, likely due to its greater translucency. : Shade and thickness play a critical role in the polymerization of bulk-fill composites. Ensuring adequate polymerization is essential for the longevity of pediatric restorations. Further in vivo research is needed to confirm these findings and assess their clinical implications.
本研究旨在通过评估低粘度大体积充填复合树脂SDR flow+的转化率（DC），来研究色度和厚度对其聚合反应的影响。使用SDR flow+复合树脂进行了一项体外研究。制备了两种厚度（2毫米和4毫米）和四种色度（通用色、A1、A2、A3）的样本。使用高强度LED固化装置进行聚合反应。使用傅里叶变换红外光谱（衰减全反射傅里叶变换红外光谱，ATR-FTIR）评估DC。色度和厚度均对DC有显著影响。与较薄样本（2毫米）相比，较厚样本（4毫米）的聚合反应降低。较深的色度，特别是A3，由于其较高的色度限制了光的穿透，表现出最低的DC值。相比之下，通用色即使在深度增加时也能达到较高的DC值，这可能是由于其更高的透明度。色度和厚度在大体积充填复合树脂的聚合反应中起着关键作用。确保充分聚合对于儿童修复体的使用寿命至关重要。需要进一步的体内研究来证实这些发现并评估其临床意义。
