Faculty of Dentistry, Thammasat University.
Assistive Technology and Medical Devices Research Center (A-MED).
Dent Mater J. 2020 Aug 2;39(4):563-570. doi: 10.4012/dmj.2019-097. Epub 2020 Feb 7.
The aim was to assess the effect of powder to liquid ratio (PLR) on setting time, fluoride release, and compressive strength of conventional glass ionomer cements (GICs) containing pre-reacted spherical glass fillers (SPG). GICs were prepared by mixing SPG with Fuji IX Universal liquid using PLR of 1:1, 1.5:1, 2:1, 2.5:1, 3:1. Setting time decreased from 221 to 51 s upon rising PLR. Increasing PLR decreased cumulative fluoride release (33 to 13 ppm). Diffusion coefficient of fluoride of experimental GICs (1.6-1.8×10 cm/s) was comparable with that of Fuji IX Universal (1.6×10 cm/s). Compressive strength of PLR 2:1 to 3:1 (93-140 MPa) were comparable with that of Fuji IX Universal (124 MPa). These results demonstrated that rising powder ratio reduced setting time, fluoride release, and compressive strength of GICs. However, the setting time and strength experimental GICs with PLR greater than 2:1 were in the acceptable range of the ISO standard.
目的在于评估粉液比（PLR）对含有预反应球形玻璃填料（SPG）的传统玻璃离子水门汀（GIC）凝固时间、氟释放和抗压强度的影响。通过将 SPG 与 Fuji IX Universal 液体以 1:1、1.5:1、2:1、2.5:1、3:1 的 PLR 混合来制备 GIC。随着 PLR 的增加，凝固时间从 221 秒降至 51 秒。随着 PLR 的增加，累积氟释放量（从 33ppm 降至 13ppm）降低。实验性 GIC 的氟扩散系数（1.6-1.8×10 cm/s）与 Fuji IX Universal（1.6×10 cm/s）相当。PLR 为 2:1 至 3:1 的 GIC 的抗压强度（93-140MPa）与 Fuji IX Universal（124MPa）相当。这些结果表明，随着粉液比的增加，GIC 的凝固时间、氟释放和抗压强度降低。然而，PLR 大于 2:1 的实验性 GIC 的凝固时间和强度在 ISO 标准的可接受范围内。
