Scribante Andrea, Gallo Simone, Scarantino Stefano, Dagna Alberto, Poggio Claudio, Colombo Marco
Department of Clinical, Surgical, Diagnostic and Paediatric Sciences-Section of Dentistry, University of Pavia, Piazzale Golgi 2, 27100 Pavia, Italy.
Biomimetics (Basel). 2020 Oct 28;5(4):56. doi: 10.3390/biomimetics5040056.
Acidic conditions of the oral cavity, including soft drinks and cariogenic bacteria, represent a damage for restorative biomimetic composite materials. The aim of this study is to assess the influence of two different acidic challenges on the flexural strength and elastic modulus of five composites: x-tra fil (Group 1, XTF), GrandioSO x-tra (Group 2, GXT), Admira Fusion x-tra (Group 3, AFX), VisCalor bulk (Group 4, VCB), and Enamel Plus HRi (Group 5, EPH). Thirty samples for each group were randomly divided and assigned to three different treatments: storage in distilled water as the controls (subgroups 1a-5a), 3 weeks distilled water + 1 week Coca-Cola (subgroups 1b-5b), and 4 weeks Coca-Cola (subgroups 1c-5c). For each subgroup, the flexural strength and elastic modulus were measured using an Instron universal testing machine, and data were submitted to statistical analysis. Considering subgroups B, no material showed a significant difference in the flexural strength with the controls ( > 0.05), whereas for subgroups C, only GXT and VCB showed significantly lower values ( < 0.05). AFX reported the lowest flexural strength among the materials tested. As regards the elastic modulus, no material showed a significant variation after acidic storages when compared with the respective control ( > 0.05). AFX and EPH reported the lowest elastic modulus compared to the other materials. All composites tested showed adequate flexural properties according to the standards, except for AFX. This biomimetic material, along with EPH, might be indicated for V class (cervical) restorations considering the lowest values of elasticity reported.
口腔的酸性环境，包括软饮料和致龋细菌，会对修复性仿生复合材料造成损害。本研究的目的是评估两种不同酸性挑战对五种复合材料弯曲强度和弹性模量的影响：x-tra fil（第1组，XTF）、GrandioSO x-tra（第2组，GXT）、Admira Fusion x-tra（第3组，AFX）、VisCalor bulk（第4组，VCB）和Enamel Plus HRi（第5组，EPH）。每组30个样本被随机分组并分配到三种不同处理：作为对照储存在蒸馏水中（亚组1a - 5a）、3周蒸馏水 + 1周可口可乐（亚组1b - 5b）以及4周可口可乐（亚组1c - 5c）。对于每个亚组，使用英斯特朗万能试验机测量弯曲强度和弹性模量，并将数据进行统计分析。考虑亚组B，与对照组相比，没有材料的弯曲强度显示出显著差异（P > 0.05），而对于亚组C，只有GXT和VCB显示出显著较低的值（P < 0.05）。AFX在测试材料中报告的弯曲强度最低。关于弹性模量，与各自的对照组相比，没有材料在酸性储存后显示出显著变化（P > 0.05）。与其他材料相比，AFX和EPH报告的弹性模量最低。除AFX外，所有测试的复合材料根据标准都显示出足够的弯曲性能。考虑到所报告的最低弹性值，这种仿生材料以及EPH可能适用于V类（颈部）修复。
