Department of Restorative Dentistry, Faculty of Dentistry, Van Yuzuncu Yil University, Van, 65080, Turkey.
Department of Prosthetic Dentistry, Faculty of Dentistry, Akdeniz University, Antalya, Turkey.
Odontology. 2023 Oct;111(4):942-952. doi: 10.1007/s10266-023-00805-0. Epub 2023 Mar 27.
This study evaluated microleakage from class II cavities filled with bulk-fill composite preheated to different temperatures, applied at different thicknesses, and with different polymerization modes. A total of 60 mesio-occlusal cavity were drilled into the extracted human third molars at 2 mm and 4 mm thickness. Preheated bulk-fill composite resin (Viscalor; VOCO, Germany) was applied to the cavities at 68 °C and 37 °C after the adhesive resin was applied, and cured using standard and high-power light-curing modes of a VALO light-curing unit. An incrementally applied microhybrid composite was used as the control. The teeth were subjected to 2000 cycles of heating to 55 °C and cooling to 5 °C with a 30-s hold time. Then, they were immersed in a 50% silver nitrate solution for 24 h and scanned with micro-computed tomography. Scanned data were processed using the CTAn software. Two (2D) and three (3D) dimensional analyses of leached silver nitrate were performed. The data's normality was assessed using the Shapiro-Wilk test before comparisons using a three-way analysis of variance. In both 2D and 3D analysis, bulk-fill composite resin preheated to 68 °C and applied at 2 mm thickness showed less microleakage. In the 3D analysis, restorations applied at 37 °C and 4 mm thickness in high-power mode showed significantly higher values (p < 0.001). Preheated bulk-fill composite resin can be applied at 68 °C and effectively cured at both 2 mm and 4 mm thickness.
本研究评估了在不同温度下预热的块状充填复合材料充填 II 类洞时的微渗漏情况，同时还考虑了不同的厚度和聚合模式。总共在 60 个人类第三磨牙的近中-颊面窝洞内制备了 2mm 和 4mm 两种深度的窝洞。在应用粘接树脂后，将预热的块状充填复合材料（Viscalor；VOCO，德国）应用于窝洞内，温度分别为 68°C 和 37°C，并使用 VALO 光固化仪的标准和高功率光固化模式进行固化。使用增量型复合树脂作为对照。将牙齿加热至 55°C，保持 30s，然后冷却至 5°C，共进行 2000 个循环。然后，将其浸入 50%硝酸银溶液中 24 小时，并用微计算机断层扫描进行扫描。使用 CTAn 软件处理扫描数据。对浸出的硝酸银进行了二维（2D）和三维（3D）分析。在使用三因素方差分析进行比较之前，使用 Shapiro-Wilk 检验评估数据的正态性。在二维和三维分析中，68°C 预热的块状充填复合材料在 2mm 厚度时显示出较少的微渗漏。在 3D 分析中，在高功率模式下应用于 37°C 和 4mm 厚度的修复体显示出显著更高的值（p<0.001）。预热的块状充填复合材料可在 68°C 下应用，并可在 2mm 和 4mm 厚度下有效固化。
