Department of Biomaterials, College of Dentistry, Universidad de los Andes, Santiago, Chile.
NYU Grossman School of Medicine, New York University, New York, New York, USA.
J Esthet Restor Dent. 2022 Jul;34(5):804-815. doi: 10.1111/jerd.12888. Epub 2022 Feb 20.
To characterize the mechanical and biological properties of three commercially available resins, which are currently used for provisional restorations and to compare them to an experimental resin intended for definitive fixed dental prostheses.
Three commercially available resins: Crowntec (CT, Saremco), Temporary C&B (FL, Formlabs), C&B MFH (ND, Nextdent), and the experimental resin: Permanent Bridge (PB, Saremco) were printed and subjected to biaxial flexural strength test, finite element analysis, Weibull analysis, scanning electron microscopy, cell proliferation, immunohistochemistry and cytotoxicity assays. Samples from CT, PB, and ND were provided directly from the manufacturers ensuring ideal workflow. FL was printed using the workflow as recommended by the manufacturer, using a Formlabs 2 printer and their post-processing units Form Wash and Form Cure.
From the tested resins, PB yielded the best overall results in terms of mechanical properties. Cell proliferation and cytotoxicity did not show any significant differences among materials. PB showed higher values for probability of survival predictions (35%) when subjected to 250 MPa loads, whereas the other materials did not reach 10%.
Despite mechanical differences between the evaluated materials, the outcomes suggest that 3D printed provisional resins may be used in clinical settings, following the manufacturers indications. New materials intended for long-term use, such as the PB resin, yielded higher mechanical properties compared to the other materials. Alternative printing and post-processing methods have not yet been evaluated and should be avoided until further literature is available.
3D printed resins for provisional restorations have become popular with the emergence of new technologies. In this study, we evaluated three different commercially available resins for provisional restorations and one new experimental resin. The results from this study indicate that commercially available resins could be used in clinical settings under certain conditions and limited periods of time. Following the manufacturers protocols is of paramount importance to not compromise these properties.
描述三种目前用于临时修复体的商业用树脂的机械和生物学性能，并将其与一种用于最终固定义齿的实验用树脂进行比较。
使用三种商业用树脂：Crowntec（CT，Saremco）、Temporary C&B（FL，Formlabs）、C&B MFH（ND，Nextdent）和实验用树脂：Permanent Bridge（PB，Saremco）进行打印，并进行双轴弯曲强度测试、有限元分析、威布尔分析、扫描电子显微镜、细胞增殖、免疫组织化学和细胞毒性检测。从制造商处直接获得 CT、PB 和 ND 的样本，以确保理想的工作流程。FL 是按照制造商推荐的工作流程使用 Formlabs 2 打印机和他们的后处理单元 Form Wash 和 Form Cure 进行打印的。
在所测试的树脂中，PB 在机械性能方面总体上表现最佳。细胞增殖和细胞毒性在材料之间没有显示出任何显著差异。当承受 250 MPa 负载时，PB 的存活率预测值（35%）较高，而其他材料则未达到 10%。
尽管评估材料之间存在机械差异，但结果表明，3D 打印临时修复树脂可以在临床环境中使用，遵循制造商的指示。与其他材料相比，新的长期使用材料（如 PB 树脂）具有更高的机械性能。替代的打印和后处理方法尚未得到评估，在有更多文献之前应避免使用。
随着新技术的出现，用于临时修复的 3D 打印树脂变得越来越受欢迎。在这项研究中，我们评估了三种不同的商业用临时修复树脂和一种新的实验用树脂。研究结果表明，在某些条件下和有限的时间内，商业用树脂可在临床环境中使用。遵循制造商的协议对于不损害这些性能至关重要。
