Authors
Yu-Lin Hou, Fei-Long Wang, Hui-Yu Shang, Dong Xiang, Yu-Fei Wang, Li Gao, Fei-Yan Yu, Yong-Xiang Xu
Published in
Current medical science. Jul 07, 2026. Epub Jul 07, 2026.
Abstract
To overcome the trade-off between the low viscosity required for printability and the high mechanical strength required for functionality in dental resins for vat photopolymerization 3D printing by developing a hydrogen-bond engineering strategy.
Three dental oligomers (Bis-GMA, UDMA, and Bis-EMA) were blended with four diluents differing in hydrogen-bonding ability. Fourier transform infrared (FTIR) spectroscopy, rheometry, three-point bending tests and 3D printing performance tests were carried out to evaluate hydrogen bond formation, viscosity, mechanical properties, printability and accuracy.
FTIR and rheological tests confirmed strong hydrogen bonding between MAA and matrix oligomers. The optimized formulation, n(MAA): n(UDMA) = 2:1, achieved flexural strengths of 228 MPa (mold-filled) and 178 MPa (3D-printed) and elastic modulus of 5.3 GPa and 4.0 GPa, respectively, whereas the viscosity was only 307 mPa·s-a dramatic improvement over that of neat UDMA (viscosity 9689 mPa·s, mold-filled mechanical strength 174 MPa and 3.8 GPa). The hydrogen-bonding diluents also demonstrated significant advantages in composite resin formulations.
Hydrogen bond engineering decouples viscosity from mechanical strength, enabling the fabrication of low-viscosity, high-strength dental resins for 3D printing. This scalable platform overcomes the longstanding viscosity-strength trade-off, offering promising potential for dentistry and other fields of photocurable additive manufacturing.
PMID:
42412294
Bibliographic data and abstract were imported from PubMed on 07 Jul 2026.
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