Casucci Alessio, Verniani Giulia, Barbieri Anne Lucrèce, Ricci Nicolò Maria, Ferrari Cagidiaco Edoardo, Ferrari Marco
Department of Prosthodontics, University of Siena, 53100 Siena, Italy.
Materials (Basel). 2023 Oct 5;16(19):6559. doi: 10.3390/ma16196559.
PMMA (Polymethylmethacrylate) is the material of choice to fabricate denture bases. Recently, with the introduction of CAD-CAM and 3D printers in dentistry, new materials have been proposed for complete denture manufacturing.
This study compared the flexural strength of different resins fabricated using different technologies (conventional, CAD-CAM-milled, and 3D-printed) and polymerization techniques.
A total of 11 different resins were tested: six PMMA conventional (Acrypol R, Acrypol LL, Acrypol HI, Acrypol Fast, Acryself and Acryslef P), two milled obtained from UDMA PMMA disks (Ivotion disk and Aadva disk, control groups), two 3D-printed PMMA resins (NextDent Denture 3D+, and SprintRayEU Denture Base), and one 3D-printed composite resin (GC Temp Print). Flexural strength was measured using a universal testing machine. One-way ANOVA and Bonferroni post hoc tests were performed; the -value was set at 0.05 to consider statistically significant differences among the groups. Spearman test was used to evaluate the correlation between polymerization technique and the flexural strength of 3D-printed resins.
CAD-CAM-milled specimens showed the highest flexural strength (107.87 MPa for UDMA) followed by 3D-printed composite resins (102.96 MPa). Furthermore, 3D-printed resins polymerized for 40 min with the BB cure unit showed no statistically significant differences with conventional resin groups. Moreover, in all the 3D-printed specimens, a high correlation between polymerization technique and flexural strength was found.
In terms of flexural strength, the polymerization technique is a determinant for both acrylic and composite resins. Temp Print can be a potential alternative to fabricating removable dentures and showed promising results when used in combination with pink color resin powder.
聚甲基丙烯酸甲酯（PMMA）是制作义齿基托的首选材料。近年来，随着牙科领域计算机辅助设计与计算机辅助制造（CAD - CAM）以及3D打印机的引入，已提出用于全口义齿制作的新材料。
本研究比较了使用不同技术（传统技术、CAD - CAM铣削技术和3D打印技术）以及聚合技术制作的不同树脂的弯曲强度。
共测试了11种不同的树脂：6种传统PMMA树脂（Acrypol R、Acrypol LL、Acrypol HI、Acrypol Fast、Acryself和Acryslef P），2种由UDMA PMMA盘铣削得到的树脂（Ivotion盘和Aadva盘，对照组），2种3D打印的PMMA树脂（NextDent Denture 3D +和SprintRayEU义齿基托），以及1种3D打印的复合树脂（GC Temp Print）。使用万能试验机测量弯曲强度。进行单因素方差分析和Bonferroni事后检验；将P值设定为0.05以考虑组间具有统计学意义的差异。使用Spearman检验评估聚合技术与3D打印树脂弯曲强度之间的相关性。
CAD - CAM铣削的试件显示出最高的弯曲强度（UDMA为107.87MPa），其次是3D打印的复合树脂（102.96MPa）。此外，使用BB固化单元聚合40分钟的3D打印树脂与传统树脂组相比，无统计学显著差异。而且，在所有3D打印的试件中，发现聚合技术与弯曲强度之间存在高度相关性。
就弯曲强度而言，聚合技术对于丙烯酸树脂和复合树脂都是一个决定性因素。Temp Print可以成为制作可摘义齿的一种潜在替代材料，并且与粉色树脂粉末结合使用时显示出有前景的结果。
