Helal Mohamed A, Fadl-Alah Ahmed, Baraka Yasser M, Gad Mohammed M, Emam Abdel-Naser M
Department of Removable Prosthodontics, Faculty of Dental Medicine, Al-Azhar University, Cairo, Egypt.
Department of Removable Prosthodontics, Faculty of Dental Medicine, Sinai University, Erish, Egypt.
J Int Soc Prev Community Dent. 2022 Jan 29;12(1):126-131. doi: 10.4103/jispcd.JISPCD_293_21. eCollection 2022 Jan-Feb.
There is a paucity of data regarding the effect of fabrication techniques and compositions of CAD/CAM milled, 3D-printed, and polyamide flexible denture base resin materials (DBRMs) on the surface roughness (SR), surface hardness (SH), and impact strength (IS). Therefore, this study aimed to evaluate the SR, SH, and IS of CAD/CAM milled, 3D-printed, and polyamide flexible DBRMs.
Ninety specimens were constructed from different DBRMs and divided into three groups (CAD/CAM, 3D-printed, and polyamide DBRMs; = 30) with specific measurements: 15 × 10 × 2.5 mm for SR and H tests and 80 × 10 × 4 mm notched specimen for IS test. SR meter and Vickers micro SH tester were used to measure SR and SH, respectively, whereas the IS was evaluated using Charpy's impact testing machine. Data were collected and statistically analyzed using one-way analysis of variance and Tukey's tests (=0.05).
There were significant differences between the tested materials (< 0.05). The CAD/CAM milled showed lowest SR when compared with 3D-printed resin and polyamide flexible resin (< 0.05); however, there was a significant increase in SH of CAD/CAM milled and 3D-printed DBRMs when compared with polyamide materials (< 0.05). There was a significant increase in IS of polyamide and CAD/CAM milled resins when compared with 3D-printed DBRMs ( < 0.05).
CAD/CAM milled resins showed high IS and SH with lower SR.
关于计算机辅助设计/计算机辅助制造（CAD/CAM）铣削、3D打印和聚酰胺柔性义齿基托树脂材料（DBRMs）的制作技术及成分对表面粗糙度（SR）、表面硬度（SH）和冲击强度（IS）的影响，相关数据较少。因此，本研究旨在评估CAD/CAM铣削、3D打印和聚酰胺柔性DBRMs的SR、SH和IS。
用不同的DBRMs制作90个试件，并分为三组（CAD/CAM、3D打印和聚酰胺DBRMs；每组n = 30），进行特定测量：SR和SH测试用15×10×2.5 mm的试件，IS测试用80×10×4 mm的带切口试件。分别使用SR测量仪和维氏显微硬度测试仪测量SR和SH，而IS则使用夏比冲击试验机进行评估。收集数据并使用单因素方差分析和Tukey检验进行统计分析（α = 0.05）。
测试材料之间存在显著差异（P < 0.05）。与3D打印树脂和聚酰胺柔性树脂相比，CAD/CAM铣削材料的SR最低（P < 0.05）；然而，与聚酰胺材料相比，CAD/CAM铣削和3D打印DBRMs的SH显著增加（P < 0.05）。与3D打印DBRMs相比，聚酰胺和CAD/CAM铣削树脂的IS显著增加（P < 0.05）。
CAD/CAM铣削树脂具有较高的IS和SH以及较低的SR。
