Neves Aline Borburema, Lopes Laísa Inara Gracindo, Bergstrom Tamiris Gomes, da Silva Aline Saddock Sá, Lopes Ricardo Tadeu, Neves Aline de Almeida
Department of Pediatric Dentistry and Orthodontics, Universidade Federal do Rio de Janeiro - UFRJ, School of Dentistry, Rio de Janeiro, RJ, Brazil.
Laboratory of Nuclear Instrumentation, Universidade Federal do Rio de Janeiro - UFRJ, Rio de Janeiro, RJ, Brazil.
Restor Dent Endod. 2021 Oct 29;46(4):e57. doi: 10.5395/rde.2021.46.e57. eCollection 2021 Nov.
This study aimed to compare and evaluate the porosity and pore size distribution of high-viscosity glass ionomer cements (HVGICs) and conventional glass ionomer cements (GICs) using micro-computed tomography (micro-CT).
Forty cylindrical specimens ( = 10) were produced in standardized molds using HVGICs and conventional GICs (Ketac Molar Easymix, Vitro Molar, MaxxionR, and Riva Self-Cure). The specimens were prepared according to ISO 9917-1 standards, scanned in a high-energy micro-CT device, and reconstructed using specific parameters. After reconstruction, segmentation procedures, and image analysis, total porosity and pore size distribution were obtained for specimens in each group. After checking the normality of the data distribution, the Kruskal-Wallis test followed by the Student-Newman-Keuls test was used to detect differences in porosity among the experimental groups with a 5% significance level.
Ketac Molar Easymix showed statistically significantly lower total porosity (0.15%) than MaxxionR (0.62%), Riva (0.42%), and Vitro Molar (0.57%). The pore size in all experimental cements was within the small-size range (< 0.01 mm), but Vitro Molar showed statistically significantly more pores/defects with a larger size (> 0.01 mm).
Major differences in porosity and pore size were identified among the evaluated GICs. Among these, the Ketac Molar Easymix HVGIC showed the lowest porosity and void size.
本研究旨在使用微型计算机断层扫描（micro-CT）比较和评估高粘度玻璃离子水门汀（HVGICs）和传统玻璃离子水门汀（GICs）的孔隙率和孔径分布。
使用HVGICs和传统GICs（Ketac Molar Easymix、Vitro Molar、MaxxionR和Riva Self-Cure）在标准化模具中制作40个圆柱形试件（每组 = 10个）。试件按照ISO 9917-1标准制备，在高能微型计算机断层扫描设备中进行扫描，并使用特定参数进行重建。重建后，经过分割程序和图像分析，获得每组试件的总孔隙率和孔径分布。在检查数据分布的正态性后，采用Kruskal-Wallis检验，随后进行Student-Newman-Keuls检验，以检测实验组之间孔隙率的差异，显著性水平为5%。
Ketac Molar Easymix的总孔隙率（0.15%）在统计学上显著低于MaxxionR（0.62%）、Riva（0.42%）和Vitro Molar（0.57%）。所有实验性水门汀的孔径均在小尺寸范围内（< 0.01 mm），但Vitro Molar在统计学上显示出更多尺寸较大（> 0.01 mm）的孔隙/缺陷。
在所评估的GICs中，孔隙率和孔径存在显著差异。其中，Ketac Molar Easymix HVGIC的孔隙率和孔隙尺寸最低。
