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

Lee, Hae‐Hyoung; Lee, Jung Hwan; Yang, Tae‐Hyun; Kim, Yujin; Kim, Si-Chul; Kim, Gyu-Ri; Kim, Hyung-Rae; Lee, Chung-jae; Okubo, Chikahiro

doi:10.4012/dmj.2017-373

Cited by 28 publications

(23 citation statements)

References 24 publications

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“…Specimens in the CNF-NB-A (0.05, 0.10, and 0.20 wt%) and CNF-NB-B (0.05 and 0.10 wt%) groups showed a significantly negative effect on flexural strength after immersion when compared with those in the other groups. This finding is consistent with the results of previous studies by Lee et al, where water or humid environment was reported to reduce the physical properties of some polymer resins 28,32) . The observation may be partially explained by immersion liquid absorption, which may influence the mechanical properties of denture base acrylic resins.…”

Section: Discussionsupporting

confidence: 93%

Use of cellulose nanofibers as a denture immersing solution

et al. 2020

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The purpose of this study was to investigate the influence of cellulose nanofibers (CNF) solution on the mechanical and biological properties of denture base resins (DBR). Two types of CNFs obtained from bamboo (BB) and needle-leaved (NB) trees were used in this study. We prepared 18 different CNF solutions based on their fibrillation (A-low, B-middle, and C-high) and concentration (0.05, 0.10, and 0.20 wt%). A heat-polymerized acrylic resin was used as DBR. The contact angles for each specimen were measured after immersion. The flexural properties of the immersed specimens, and the biological properties of the CNF solutions were examined. Specimens immersed in CNF-NB-C-0.05 wt% solution presented with the lowest contact angles. Specimens in CNF-NB-C and CNF-BB-A groups showed higher flexural modulus values. No cytotoxic or antimicrobial effects were observed for the CNF solutions. This study suggest that CNF solution may improve the surface wettability of the DBR without affecting its flexural property.

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Section: Discussionsupporting

confidence: 93%

Use of cellulose nanofibers as a denture immersing solution

et al. 2020

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“…However, in the present study, the specimens were stored in purified water at 37 °C for 50 h, following which the flexural test was performed in air. Some studies reported that the water immersion of denture base materials decreased their flexural strength and flexural modulus [ 42 ]. Therefore, when the flexural test is performed under water immersion according to ISO20795-1, the tendency of the flexural strength does not change, but the strength may decrease.…”

Section: Discussionmentioning

confidence: 99%

Comparison of Mechanical Properties of PMMA Disks for Digitally Designed Dentures

et al. 2021

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In this study, the physical properties of a custom block manufactured using a self-polymerizing resin (Custom-block), the commercially available CAD/CAM PMMA disk (PMMA-disk), and a heat-polymerizing resin (Conventional PMMA) were evaluated via three different tests. The Custom-block was polymerized by pouring the self-polymerizing resin into a special tray, and Conventional PMMA was polymerized with a heat-curing method, according to the manufacturer’s recommended procedure. The specimens of each group were subjected to three-point bending, water sorption and solubility, and staining tests. The results showed that the materials met the requirements of the ISO standards in all tests, except for the staining tests. The highest flexural strength was exhibited by the PMMA-disk, followed by the Custom-block and the Conventional PMMA, and a significant difference was observed in the flexural strengths of all the materials (p < 0.001). The Custom-block showed a significantly higher flexural modulus and water solubility. The water sorption and discoloration of the Custom-block were significantly higher than those of the PMMA-disk, but not significantly different from those of the Conventional PMMA. In conclusion, the mechanical properties of the three materials differed depending on the manufacturing method, which considerably affected their flexural strength, flexural modulus, water sorption and solubility, and discoloration.

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“…The type of denture base resin affects the bonding ability of artificial teeth to denture base resins 12) . A previous report showed that the ultimate flexural strength of polycarbonate is higher than that of polyamide and polyester 24) . Further, the ultimate flexural strength of polyamide is lower than that of polycarbonate and polyester.…”

Section: Discussionmentioning

confidence: 89%

“…Therefore, polycarbonate is rigid and fairly inflexible, whereas polyamide is soft and highly flexible. The mechanical property of polyester is between that of polycarbonate and polyamide 24) . Furthermore, all specimens were soaked in water for 10 days in this study as it is possible for the mechanical properties to change because of water absorption.…”

Section: Discussionmentioning

confidence: 99%

Bond strength of artificial teeth to thermoplastic denture base resin for injection molding

et al. 2021

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This research was conducted to investigate the bond strength between artificial teeth and a thermoplastic denture base resin for injection molding with different surface preparations for use in flexible resin removable partial dentures. Composite resin denture teeth and acrylic denture resin teeth were bonded to three types of thermoplastic denture base resins for injection molding (polyamide, polyester, and polycarbonate) and a conventional heat-polymerized polymethyl methacrylate (PMMA) resin (control). The ridge lap surfaces of the artificial teeth were classified into four groups based on the type of ridge lap surface treatment applied (n=10): no treatment, ethyl acetate, small T-shaped tunnel, and large T-shaped tunnel. The specimens were tested for bond strength. The results showed that the ethyl acetate treatment was ineffective for enhancing the bond strength (p>0.05) between the artificial teeth and thermoplastic denture base resin for injection molding, whereas the T-shaped tunnel was quite effective in this regard (p<0.05).

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

Cited by 28 publications

References 24 publications

Use of cellulose nanofibers as a denture immersing solution

Use of cellulose nanofibers as a denture immersing solution

Comparison of Mechanical Properties of PMMA Disks for Digitally Designed Dentures

Bond strength of artificial teeth to thermoplastic denture base resin for injection molding

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