Alnsour Marwa M, Alamoush Rasha A, Silikas Nikolaos, Satterthwaite Julian D
Department of Restorative Dentistry, School of Dentistry, University of Jordan, Amman 11942, Jordan.
Dental Department, Jordan University Hospital, Amman 13046, Jordan.
J Funct Biomater. 2024 Oct 1;15(10):292. doi: 10.3390/jfb15100292.
This study aimed to investigate the effect of acidic media storage (gastric acid and Coca-Cola) on the mechanical properties of CAD/CAM materials. Three types of materials were tested: a polymer-infiltrated ceramic network (PICN) (Vita Enamic (En), VITA Zahnfabrik, Germany), a resin composite block (RCB) (Cerasmart (Cs), GC Corp, Japan), and a conventional resin-based composite (Gradia direct (Gr), GC Corp, Japan), which was used as a control. Beam-shaped specimens of each material, with dimensions of 16 mm × 4 mm × 1.5 mm, were prepared (90 in total). The specimens were divided into subgroups (10 each) and stored for 96 h in either gastric acid, Coca-Cola, or distilled water. Flexural strength and elastic modulus were evaluated using a three-point flexural strength test with acoustic emission (AE) monitoring. Vickers microhardness was measured before and after storage in gastric acid and Coca-Cola. Data were statistically analysed using two-way and one-way ANOVA, the Tukey's post hoc, and independent -test at a significance level of 0.05. The results showed that Cs and En maintained their flexural strength and elastic modulus after acidic media exposure, while Gr experienced a significant decrease in flexural strength following gastric acid storage ( < 0.01). Initial crack detection was not possible using the AE system, impacting the determination of flexural strength. Exposure to acidic media decreased all materials' microhardness, with Gr showing the most notable reduction ( < 0.0001). Gastric acid had a greater impact on the microhardness of all tested materials compared to Coca-Cola ( < 0.0001). In conclusion, storage in erosive media did not notably affect the flexural strength or elastic modulus of CAD/CAM composites but it did affect hardness. CAD/CAM composite blocks demonstrated superior mechanical properties compared to the conventional composite.
本研究旨在调查酸性介质储存（胃酸和可口可乐）对CAD/CAM材料力学性能的影响。测试了三种类型的材料：一种聚合物渗透陶瓷网络（PICN）（维他瓷聚体（En），德国维他齿科有限公司）、一种树脂复合块（RCB）（晶瓷玛（Cs），日本GC公司）以及一种传统树脂基复合材料（格拉蒂亚直接修复树脂（Gr），日本GC公司），后者用作对照。制备了每种材料的梁形试样，尺寸为16毫米×4毫米×1.5毫米（共90个）。将试样分成亚组（每组10个），并在胃酸、可口可乐或蒸馏水中储存96小时。使用带声发射（AE）监测的三点弯曲强度试验评估弯曲强度和弹性模量。在胃酸和可口可乐中储存前后测量维氏显微硬度。使用双向和单向方差分析、Tukey事后检验以及显著性水平为0.05的独立t检验对数据进行统计分析。结果表明，Cs和En在酸性介质暴露后保持了其弯曲强度和弹性模量，而Gr在胃酸储存后弯曲强度显著降低（P<0.01）。使用AE系统无法检测到初始裂纹，影响了弯曲强度的测定。暴露于酸性介质会降低所有材料的显微硬度，其中Gr的降低最为显著（P<0.0001）。与可口可乐相比，胃酸对所有测试材料的显微硬度影响更大（P<0.0001）。总之，在侵蚀性介质中储存对CAD/CAM复合材料的弯曲强度或弹性模量没有显著影响，但会影响硬度。与传统复合材料相比，CAD/CAM复合块表现出优异的力学性能。
