Alsunbul Hanan, Khan Aftab Ahmed, De Vera Merry Angelyn Tan, Bautista Leonel S J, Javed Ravish
Restorative Dentistry Department, College of Dentistry, King Saud University, Riyadh 11451, Saudi Arabia.
Dental Health Department, College of Applied Medical Sciences, King Saud University, Riyadh 11451, Saudi Arabia.
Biomimetics (Basel). 2023 Aug 5;8(4):347. doi: 10.3390/biomimetics8040347.
This study aimed to determine the reinforcing effect of two weight ratios of Gum Arabic (GA) natural biopolymer, i.e., 0.5% and 1.0% in the powdered composition of glass ionomer luting cement. GA powder was oxidized and GA-reinforced GIC in 0.5 and 1.0 wt.% formulations were prepared in rectangular bars using two commercially available GIC luting materials (Medicem and Ketac Cem Radiopaque). The control groups of both materials were prepared as such. The effect of reinforcement was evaluated in terms of microhardness, flexural strength (FS), fracture toughness (FT), and tensile strength (TS). The internal porosity and water contact angle formation on the study samples were also evaluated. Film thickness was measured to gauge the effect of micron-sized GA powder in GA-GIC composite. Paired sample -tests were conducted to analyze data for statistical significance ( < 0.05). The experimental groups of both materials containing 0.5 wt.% GA-GIC significantly improved FS, FT, and TS compared to their respective control groups. However, the microhardness significantly decreased in experimental groups of both cements compared to their respective control groups. The addition of GA powder did not cause a significant increase in film thickness and the water contact angle of both 0.5 and 1.0 wt.% GA-GIC formulations were less than 90. Interestingly, the internal porosity of 0.5 wt.% GA-GIC formulations in both materials were observed less compared to their respective control groups. The significantly higher mechanical properties and low porosity in 0.5 wt.% GA-GIC formulations compared to their respective control group indicate that reinforcing GA powder with 0.5 wt.% in GIC might be promising in enhancing the mechanical properties of GIC luting materials.
本研究旨在确定两种重量比（即0.5%和1.0%）的阿拉伯胶（GA）天然生物聚合物在玻璃离子水门汀粉末组合物中的增强效果。将GA粉末氧化，并使用两种市售的玻璃离子水门汀材料（Medicem和Ketac Cem Radiopaque）制备0.5重量%和1.0重量%配方的GA增强型玻璃离子水门汀矩形棒。两种材料的对照组也按此制备。从显微硬度、抗弯强度（FS）、断裂韧性（FT）和拉伸强度（TS）方面评估增强效果。还评估了研究样品的内部孔隙率和水接触角形成情况。测量膜厚度以评估微米级GA粉末在GA-玻璃离子水门汀复合材料中的作用。进行配对样本检验以分析数据的统计学显著性（<0.05）。与各自的对照组相比，两种材料中含有0.5重量%GA-玻璃离子水门汀的实验组的FS、FT和TS均有显著提高。然而，与各自的对照组相比，两种水泥实验组的显微硬度均显著降低。添加GA粉末并未导致膜厚度显著增加，且0.5重量%和1.0重量%GA-玻璃离子水门汀配方的水接触角均小于90°。有趣的是，与各自的对照组相比，两种材料中0.5重量%GA-玻璃离子水门汀配方的内部孔隙率均较低。与各自的对照组相比，0.5重量%GA-玻璃离子水门汀配方具有显著更高的机械性能和低孔隙率，这表明在玻璃离子水门汀中添加0.5重量%的增强GA粉末可能有望提高玻璃离子水门汀材料的机械性能。
