Comparative Study on Flexural Strength of Four Different Digital Dental Base Materials

doi:10.13701/j.cnki.kqyxyj.2026.05.005

Abstract

Abstract: Objective: To compare the flexural strength of four different digital dental base materials, and provide evidence for their clinical application. Methods: Four different digital dental base materials including two milling resin [computer-aided design/computer-aided manufacture (CAD/CAM) polymethyl methacrylate (PMMA) and ADT resin] and two 3D printing resin (HGT resin and HJT resin) were selected and fabricated samples with the size of 80 mm×10 mm×4 mm (n=8). A three-point bending test was carried out by using a Universal Testing Machine. The flexural strength were calculated, and the failure mode of the samples was observed by SEM. Results: Statistical difference was found between milling samples and 3D printing samples for fracture resistance and flexural strength (P<0.05). Statistical difference was also found between CAD/CAM PMMA and ADT resin (P<0.05) while not found between HGT resin and HJT resin (P>0.05) for flexural strength and fracture resistance. The flexural strengths of two 3D printing resins were lower than 65 Mpa. The failure modes of four resins were all brittle fracture. Conclusion: The flexural strength of CAD/CAM PMMA and ADT resin meet the requirements of digital complete denture base resin, while that of HGT and HJT resin is lower than the requirements.

Key words: CAD/CAM PMMA, ADT resin, HGT resin, HJT resin, flexural strength, failure mode

ZHAO Tianran, LIU Yuxiao. Comparative Study on Flexural Strength of Four Different Digital Dental Base Materials[J]. Journal of Oral Science Research, 2026, 42(5): 386-390.

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