Siqueira Joyce Roma Correia Dos Santos, Rodriguez Rita Maria Morejon, Campos Tiago Moreira Bastos, Ramos Nathalia de Carvalho, Bottino Marco Antonio, Tribst João Paulo Mendes
Department of Dental Materials and Prosthodontics, São Paulo State University (Unesp), Institute of Science and Technology, São José dos Campos 12245-000, Brazil.
Department of Prosthodontics and Periodontology, Bauru School of Dentistry, University of São Paulo, Bauru 17012-901, Brazil.
Materials (Basel). 2024 Mar 26;17(7):1496. doi: 10.3390/ma17071496.
The present study aimed to characterize the microstructure of a temporary 3D printing polymer-based composite material (Resilab Temp), evaluating its optical properties and mechanical behavior according to different post-curing times. For the analysis of the surface microstructure and establishment of the best printing pattern, samples in bar format following ISO 4049 (25 × 10 × 3 mm) were designed in CAD software (Rhinoceros 6.0), printed on a W3D printer (Wilcos), and light-cured in Anycubic Photon for different lengths of time (no post-curing, 16 min, 32 min, and 60 min). For the structural characterization, analyses were carried out using Fourier transform infrared spectroscopy (FT-IR) and scanning electron microscopy (SEM). The mechanical behavior of this polymer-based composite material was determined based on flexural strength tests and Knoop microhardness. Color and translucency analysis were performed using a spectrophotometer (VITA Easy Shade Advanced 4.0), which was then evaluated in CIELab, using gray, black, and white backgrounds. All analyses were performed immediately after making the samples and repeated after thermal aging over two thousand cycles (5-55 °C). The results obtained were statistically analyzed with a significance level of 5%. FT-IR analysis showed about a 46% degree of conversion on the surface and 37% in the center of the resin sample. The flexural strength was higher for the groups polymerized for 32 min and 1 h, while the Knoop microhardness did not show a statistical difference between the groups. Color and translucency analysis also did not show statistical differences between groups. According to all of the analyses carried out in this study, for the evaluated material, a post-polymerization time of 1 h should be suggested to improve the mechanical performance of 3D-printed devices.
本研究旨在表征一种临时的基于3D打印聚合物的复合材料（Resilab Temp）的微观结构，根据不同的后固化时间评估其光学性能和力学行为。为了分析表面微观结构并确定最佳打印图案，按照ISO 4049（25×10×3 mm）设计了棒状样品，并在CAD软件（Rhinoceros 6.0）中进行设计，在W3D打印机（Wilcos）上打印，并在Anycubic Photon中进行不同时长的光固化（无后固化、16分钟、32分钟和60分钟）。为了进行结构表征，使用傅里叶变换红外光谱（FT-IR）和扫描电子显微镜（SEM）进行分析。基于弯曲强度测试和努氏显微硬度测定这种基于聚合物的复合材料的力学行为。使用分光光度计（VITA Easy Shade Advanced 4.0）进行颜色和半透明性分析，然后在CIELab中使用灰色、黑色和白色背景进行评估。所有分析均在制备样品后立即进行，并在经过两千次循环（5 - 55°C）的热老化后重复进行。所得结果进行统计学分析，显著性水平为5%。FT-IR分析表明，树脂样品表面的转化率约为46%，中心为37%。聚合32分钟和1小时的组的弯曲强度较高，而努氏显微硬度在各组之间未显示出统计学差异。颜色和半透明性分析在各组之间也未显示出统计学差异。根据本研究进行的所有分析，对于所评估的材料，建议后聚合时间为1小时以提高3D打印装置的力学性能。
