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Dent Mater J. 2018 Nov 30;37(6):950-956. doi: 10.4012/dmj.2017-373. Epub 2018 Mar 7.

Evaluation of the flexural mechanical properties of various thermoplastic denture base polymers.

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Department of Biomaterials Science, College of Dentistry, Dankook University.
Institute of Tissue Regeneration Engineering, Dankook University.
Department of Dental Technology, Chungbuk Health & Science University.
Department of Dental Laboratory, Gimcheon University.
Department of Dental Technology, Shinhan University.
Department of Removable Prosthodontics, School of Dental Medicine, Tsurumi University.


This study evaluated the flexural mechanical properties of various thermoplastic denture base polymers (six polyamides, four acrylic resins, polyester, polypropylene, and polycarbonate) by three different testing conditions; specimens were tested in water bath at 37°C (Wet/Water, by ISO 20795-1), or in ambient air (Wet/Air) after being immersed in distilled water for 50 h, or after desiccation for 7 days (Dry/Air). The mean ultimate flexural strength (UFS) and flexural modulus (FM) for most products ranged from 27 to 61 MPa and from 611 to 1,783 MPa respectively, which failed to meet the minimum requirements of the international standard, except for polycarbonate (89 and 2,245 MPa). The mean UFS and FM values were ranked Dry/Air>Wet/Air>Wet/Water (p<0.05). In conclusion, the flexural mechanical properties of denture base polymers varied with the products and were significantly affected by the testing medium (air or water) and specimen conditions (wet or dry).


Flexural modulus; ISO 20795-1; Test condition; Thermoplastic denture base polymer; Ultimate flexural strength

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