Sadek Hoda M Abdel, El-Banna Ahmed
Department of Fixed Prosthodontics, Faculty of Dentistry, Ain Shams University, Cairo, Egypt.
Department of Dental Biomaterials, Faculty of Dentistry, Ain Shams University, Cairo, Egypt.
J Prosthodont. 2024 Feb;33(2):149-156. doi: 10.1111/jopr.13662. Epub 2023 Feb 22.
Durability is a critical factor for the success of long-term provisional restorations. This study evaluated the effect of different storage media and cyclic loading on the biaxial flexural strength of different types of provisional materials.
Discs (N = 360, 10 × 2 mm) were prepared from different provisional materials; conventional (Protemp 4, Tuff-Temp, Tempron), CAD-CAM milled (VITA CAD-Temp, breCAM.multiCOM), and 3D-printed (Nextdent C&B MFH) (n = 60). Each material group was subdivided into four subgroups according to the storage media (n = 15): nonaged, artificial saliva, mouthwash, and coffee. The specimens in storage media were placed in an incubator at 37°C for 4 weeks followed by 60,000 simulated chewing cycles. Biaxial flexural strength test was done. Data were analyzed using two-way ANOVA. Weibull distribution parameters were estimated.
Both the material and aging protocol showed a significant effect on the biaxial flexural strength. Both Protemp 4 and Nextdent C&B MFH showed a significantly higher biaxial flexural strength before and after aging compared to all other materials. Protemp 4 and Tuff Temp showed a significant decrease in strength with aging. CAD-CAM materials showed higher Weibull moduli.
The 3D-printed polymethylmethacrylate provisional material presents with both greater biaxial flexural strength and increased durability against chemical and mechanical aging compared to conventional and CAD-CAM milled provisional materials tested.
耐久性是长期临时修复成功的关键因素。本研究评估了不同储存介质和循环加载对不同类型临时材料双轴弯曲强度的影响。
用不同的临时材料制备圆盘（N = 360，10×2 mm）；传统材料（Protemp 4、Tuff-Temp、Tempron）、CAD-CAM铣削材料（VITA CAD-Temp、breCAM.multiCOM）和3D打印材料（Nextdent C&B MFH）（n = 60）。根据储存介质将每个材料组再细分为四个亚组（n = 15）：未老化、人工唾液、漱口水和咖啡。将储存介质中的标本置于37°C培养箱中4周，然后进行60,000次模拟咀嚼循环。进行双轴弯曲强度测试。使用双向方差分析对数据进行分析。估计威布尔分布参数。
材料和老化方案均对双轴弯曲强度有显著影响。与所有其他材料相比，Protemp 4和Nextdent C&B MFH在老化前后均表现出显著更高的双轴弯曲强度。Protemp 4和Tuff Temp的强度随老化而显著降低。CAD-CAM材料显示出更高的威布尔模量。
与测试的传统和CAD-CAM铣削临时材料相比，3D打印的聚甲基丙烯酸甲酯临时材料具有更高的双轴弯曲强度以及更高的抗化学和机械老化耐久性。
