The Experts below are selected from a list of 279 Experts worldwide ranked by ideXlab platform
Yutaka Takahashi - One of the best experts on this subject based on the ideXlab platform.
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effect of reinforcement on the flexural properties of injection molded thermoplastic denture base resins
Journal of Prosthodontics, 2017Co-Authors: Hirono Sasaki, Ippei Hamanaka, Yutaka Takahashi, Tomohiro KawaguchiAbstract:Purpose To evaluate the effect of reinforcement on the flexural properties of injection-molded thermoplastic denture base resins. Materials and Methods Three injection-molded thermoplastic denture base resins (polyamide, polyester, polycarbonate) were selected for this study, and a conventional heat-polymerized denture base resin (PMMA) was used as a control. Continuous unidirectional glass fiber-reinforced composite (FRC) and metal wire were used for reinforcement. Reinforced bar-shaped specimens (65 mm long, 10 mm wide, 3.3 mm high) were fabricated (n = 10). The flexural strength at the Proportional Limit (FS-PL) and the elastic modulus were measured using a three-point bending test. Results All the denture base material specimens reinforced with FRC possessed a significantly higher FS-PL compared to those without reinforcement. The FS-PL of the polycarbonate specimens reinforced with metal wire was significantly higher than that without reinforcement, and there was no significant difference in the FS-PL between the polycarbonate specimens reinforced with FRC and those with metal wire. The order of the elastic modulus according to the denture base material, arranged in terms of statistical significance, was as follows: PMMA (3.46 ± 0.53 GPa) > polycarbonate (2.69 ± 0.48 GPa) > polyester (2.00 ± 0.39 GPa) > polyamide (1.14 ± 0.35 GPa). The order of the elastic modulus according to the reinforcement, arranged in terms of statistical significance, was as follows: metal wire (2.74 ± 0.96 GPa) > FRC (2.40 ± 0.89 GPa) > no reinforcement (1.82 ± 0.83 GPa). Conclusion Continuous unidirectional glass fiber-reinforced composite (FRC) reinforcement had a satisfactory reinforcing effect for the injection-molded thermoplastic denture base resins.
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reinforcing effect of glass fiber reinforced composite reinforcement on flexural strength at Proportional Limit of a repaired denture base resin
Acta biomaterialia odontologica Scandinavica, 2015Co-Authors: Kaneyoshi Yoshida, Hirono Sasaki, Tomohiro Kawaguchi, Ippei Hamanaka, Yutaka Takahashi, Hiroshi ShimizuAbstract:Objective: This study evaluated the reinforcing effect of glass fiber-reinforced composite (FRC) reinforcement on flexural strength at the Proportional Limit (FS-PL) of a repaired denture base resin. Materials and methods: Repaired denture base resins reinforced with metal and with FRC reinforcement, and that without reinforcement were tested. The ultimate flexural strength, the FS-PL and the elastic modulus of repaired denture base resins were tested. The joint efficiency (times) of the repaired denture base resins on the intact denture base resin was evaluated. Results: The repaired denture base resins reinforced with metal reinforcement and with FRC reinforcement had significantly higher ultimate flexural strength than the repaired denture base resin without reinforcement (p 0.05). The FS-PL of a repaired denture base resin reinforced with the FRC reinforcement was similar to that with the metal reinforcement (p > 0.05), and these were significantly higher than the FS-PL of a repaired denture base resin without reinforcement (p < 0.05). The elastic modulus of the repaired denture base resin reinforced with the FRC reinforcement was significantly lower than that with metal reinforcement (p < 0.05) and was significantly higher than that without reinforcement (p < 0.05). The joint efficiency of the FRC reinforced specimen was 0.98. Conclusion: The FRC reinforcement had a reinforcing effect on the FS-PL of a repaired denture base resin.
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Reinforcing effect of glass fiber-reinforced composite reinforcement on flexural strength at Proportional Limit of a repaired denture base resin
Acta biomaterialia odontologica Scandinavica, 2015Co-Authors: Kaneyoshi Yoshida, Hirono Sasaki, Tomohiro Kawaguchi, Ippei Hamanaka, Yutaka Takahashi, Hiroshi ShimizuAbstract:AbstractObjective: This study evaluated the reinforcing effect of glass fiber-reinforced composite (FRC) reinforcement on flexural strength at the Proportional Limit (FS-PL) of a repaired denture base resin.Materials and methods: Repaired denture base resins reinforced with metal and with FRC reinforcement, and that without reinforcement were tested. The ultimate flexural strength, the FS-PL and the elastic modulus of repaired denture base resins were tested. The joint efficiency (times) of the repaired denture base resins on the intact denture base resin was evaluated.Results: The repaired denture base resins reinforced with metal reinforcement and with FRC reinforcement had significantly higher ultimate flexural strength than the repaired denture base resin without reinforcement (p 0.05). The FS-PL of a repaired denture base resin reinforced with the FRC reinforcement was similar to that with the metal reinforcement (p > 0.05), and these ...
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effect of thermal shock on mechanical properties of injection molded thermoplastic denture base resins
Acta Odontologica Scandinavica, 2012Co-Authors: Yutaka Takahashi, Ippei Hamanaka, Hiroshi ShimizuAbstract:Abstract Objective. This study investigated the effect of thermal shock on the mechanical properties of injection-molded thermoplastic denture base resins. Materials and methods. Four thermoplastic resins (two polyamides, one polyethylene terephthalate, one polycarbonate) and, as a control, a conventional heat-polymerized polymethyl methacrylate (PMMA), were tested. Specimens of each denture base material were fabricated according to ISO 1567 and were either thermocycled or not thermocycled (n = 10). The flexural strength at the Proportional Limit (FS-PL), the elastic modulus and the Charpy impact strength of the denture base materials were estimated. Results. Thermocycling significantly decreased the FS-PL of one of the polyamides and the PMMA and it significantly increased the FS-PL of one of the polyamides. In addition, thermocycling significantly decreased the elastic modulus of one of the polyamides and significantly increased the elastic moduli of one of the polyamides, the polyethylene terephthalat...
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effect of location of glass fiber reinforced composite reinforcement on the flexural properties of a maxillary complete denture in vitro
Acta Odontologica Scandinavica, 2011Co-Authors: Yutaka Takahashi, Kaneyoshi Yoshida, Hiroshi ShimizuAbstract:Objective. To evaluate the effect of the location of glass fiber-reinforced composite (FRC) reinforcement on the flexural load at the Proportional Limit (FL-PL) and the flexural deflection of a maxillary acrylic resin complete denture. Material and methods. Maxillary acrylic resin complete dentures strengthened with and without FRC reinforcement were tested. The polymerized FRC was embedded in the denture base resin in the doughy state and placed (1) under the ridge lap region, (2) in the anterior region, (3) in the middle region or (4) in the anterior and posterior regions. The FL-PL and flexural deflection value at the 100-N loading point of the reinforced maxillary denture specimens were tested. Results. All of the reinforced dentures had a higher FL-PL than the denture without reinforcement but the FL-PL values of all the dentures were not significantly different from each other. The efficiency of the FRC reinforcement compared to the unreinforced denture was 1.54-1.75 times greater. All of the reinforced dentures showed significantly lower deflection compared to the unreinforced denture, but the flexural deflections of all the dentures were not significantly different from each other. Conclusions. The location of the FRC reinforcement did not affect the fracture resistance of the maxillary acrylic resin complete denture. All of the reinforced dentures had higher FL-PL and lower flexural deflection than the denture without reinforcement.
Tomohiro Kawaguchi - One of the best experts on this subject based on the ideXlab platform.
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effect of reinforcement on the flexural properties of injection molded thermoplastic denture base resins
Journal of Prosthodontics, 2017Co-Authors: Hirono Sasaki, Ippei Hamanaka, Yutaka Takahashi, Tomohiro KawaguchiAbstract:Purpose To evaluate the effect of reinforcement on the flexural properties of injection-molded thermoplastic denture base resins. Materials and Methods Three injection-molded thermoplastic denture base resins (polyamide, polyester, polycarbonate) were selected for this study, and a conventional heat-polymerized denture base resin (PMMA) was used as a control. Continuous unidirectional glass fiber-reinforced composite (FRC) and metal wire were used for reinforcement. Reinforced bar-shaped specimens (65 mm long, 10 mm wide, 3.3 mm high) were fabricated (n = 10). The flexural strength at the Proportional Limit (FS-PL) and the elastic modulus were measured using a three-point bending test. Results All the denture base material specimens reinforced with FRC possessed a significantly higher FS-PL compared to those without reinforcement. The FS-PL of the polycarbonate specimens reinforced with metal wire was significantly higher than that without reinforcement, and there was no significant difference in the FS-PL between the polycarbonate specimens reinforced with FRC and those with metal wire. The order of the elastic modulus according to the denture base material, arranged in terms of statistical significance, was as follows: PMMA (3.46 ± 0.53 GPa) > polycarbonate (2.69 ± 0.48 GPa) > polyester (2.00 ± 0.39 GPa) > polyamide (1.14 ± 0.35 GPa). The order of the elastic modulus according to the reinforcement, arranged in terms of statistical significance, was as follows: metal wire (2.74 ± 0.96 GPa) > FRC (2.40 ± 0.89 GPa) > no reinforcement (1.82 ± 0.83 GPa). Conclusion Continuous unidirectional glass fiber-reinforced composite (FRC) reinforcement had a satisfactory reinforcing effect for the injection-molded thermoplastic denture base resins.
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Reinforcing effect of glass fiber-reinforced composite reinforcement on flexural strength at Proportional Limit of a repaired denture base resin
Acta biomaterialia odontologica Scandinavica, 2015Co-Authors: Kaneyoshi Yoshida, Hirono Sasaki, Tomohiro Kawaguchi, Ippei Hamanaka, Yutaka Takahashi, Hiroshi ShimizuAbstract:AbstractObjective: This study evaluated the reinforcing effect of glass fiber-reinforced composite (FRC) reinforcement on flexural strength at the Proportional Limit (FS-PL) of a repaired denture base resin.Materials and methods: Repaired denture base resins reinforced with metal and with FRC reinforcement, and that without reinforcement were tested. The ultimate flexural strength, the FS-PL and the elastic modulus of repaired denture base resins were tested. The joint efficiency (times) of the repaired denture base resins on the intact denture base resin was evaluated.Results: The repaired denture base resins reinforced with metal reinforcement and with FRC reinforcement had significantly higher ultimate flexural strength than the repaired denture base resin without reinforcement (p 0.05). The FS-PL of a repaired denture base resin reinforced with the FRC reinforcement was similar to that with the metal reinforcement (p > 0.05), and these ...
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reinforcing effect of glass fiber reinforced composite reinforcement on flexural strength at Proportional Limit of a repaired denture base resin
Acta biomaterialia odontologica Scandinavica, 2015Co-Authors: Kaneyoshi Yoshida, Hirono Sasaki, Tomohiro Kawaguchi, Ippei Hamanaka, Yutaka Takahashi, Hiroshi ShimizuAbstract:Objective: This study evaluated the reinforcing effect of glass fiber-reinforced composite (FRC) reinforcement on flexural strength at the Proportional Limit (FS-PL) of a repaired denture base resin. Materials and methods: Repaired denture base resins reinforced with metal and with FRC reinforcement, and that without reinforcement were tested. The ultimate flexural strength, the FS-PL and the elastic modulus of repaired denture base resins were tested. The joint efficiency (times) of the repaired denture base resins on the intact denture base resin was evaluated. Results: The repaired denture base resins reinforced with metal reinforcement and with FRC reinforcement had significantly higher ultimate flexural strength than the repaired denture base resin without reinforcement (p 0.05). The FS-PL of a repaired denture base resin reinforced with the FRC reinforcement was similar to that with the metal reinforcement (p > 0.05), and these were significantly higher than the FS-PL of a repaired denture base resin without reinforcement (p < 0.05). The elastic modulus of the repaired denture base resin reinforced with the FRC reinforcement was significantly lower than that with metal reinforcement (p < 0.05) and was significantly higher than that without reinforcement (p < 0.05). The joint efficiency of the FRC reinforced specimen was 0.98. Conclusion: The FRC reinforcement had a reinforcing effect on the FS-PL of a repaired denture base resin.
Hiroshi Shimizu - One of the best experts on this subject based on the ideXlab platform.
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Reinforcing effect of glass fiber-reinforced composite reinforcement on flexural strength at Proportional Limit of a repaired denture base resin
Acta biomaterialia odontologica Scandinavica, 2015Co-Authors: Kaneyoshi Yoshida, Hirono Sasaki, Tomohiro Kawaguchi, Ippei Hamanaka, Yutaka Takahashi, Hiroshi ShimizuAbstract:AbstractObjective: This study evaluated the reinforcing effect of glass fiber-reinforced composite (FRC) reinforcement on flexural strength at the Proportional Limit (FS-PL) of a repaired denture base resin.Materials and methods: Repaired denture base resins reinforced with metal and with FRC reinforcement, and that without reinforcement were tested. The ultimate flexural strength, the FS-PL and the elastic modulus of repaired denture base resins were tested. The joint efficiency (times) of the repaired denture base resins on the intact denture base resin was evaluated.Results: The repaired denture base resins reinforced with metal reinforcement and with FRC reinforcement had significantly higher ultimate flexural strength than the repaired denture base resin without reinforcement (p 0.05). The FS-PL of a repaired denture base resin reinforced with the FRC reinforcement was similar to that with the metal reinforcement (p > 0.05), and these ...
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reinforcing effect of glass fiber reinforced composite reinforcement on flexural strength at Proportional Limit of a repaired denture base resin
Acta biomaterialia odontologica Scandinavica, 2015Co-Authors: Kaneyoshi Yoshida, Hirono Sasaki, Tomohiro Kawaguchi, Ippei Hamanaka, Yutaka Takahashi, Hiroshi ShimizuAbstract:Objective: This study evaluated the reinforcing effect of glass fiber-reinforced composite (FRC) reinforcement on flexural strength at the Proportional Limit (FS-PL) of a repaired denture base resin. Materials and methods: Repaired denture base resins reinforced with metal and with FRC reinforcement, and that without reinforcement were tested. The ultimate flexural strength, the FS-PL and the elastic modulus of repaired denture base resins were tested. The joint efficiency (times) of the repaired denture base resins on the intact denture base resin was evaluated. Results: The repaired denture base resins reinforced with metal reinforcement and with FRC reinforcement had significantly higher ultimate flexural strength than the repaired denture base resin without reinforcement (p 0.05). The FS-PL of a repaired denture base resin reinforced with the FRC reinforcement was similar to that with the metal reinforcement (p > 0.05), and these were significantly higher than the FS-PL of a repaired denture base resin without reinforcement (p < 0.05). The elastic modulus of the repaired denture base resin reinforced with the FRC reinforcement was significantly lower than that with metal reinforcement (p < 0.05) and was significantly higher than that without reinforcement (p < 0.05). The joint efficiency of the FRC reinforced specimen was 0.98. Conclusion: The FRC reinforcement had a reinforcing effect on the FS-PL of a repaired denture base resin.
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effect of thermal shock on mechanical properties of injection molded thermoplastic denture base resins
Acta Odontologica Scandinavica, 2012Co-Authors: Yutaka Takahashi, Ippei Hamanaka, Hiroshi ShimizuAbstract:Abstract Objective. This study investigated the effect of thermal shock on the mechanical properties of injection-molded thermoplastic denture base resins. Materials and methods. Four thermoplastic resins (two polyamides, one polyethylene terephthalate, one polycarbonate) and, as a control, a conventional heat-polymerized polymethyl methacrylate (PMMA), were tested. Specimens of each denture base material were fabricated according to ISO 1567 and were either thermocycled or not thermocycled (n = 10). The flexural strength at the Proportional Limit (FS-PL), the elastic modulus and the Charpy impact strength of the denture base materials were estimated. Results. Thermocycling significantly decreased the FS-PL of one of the polyamides and the PMMA and it significantly increased the FS-PL of one of the polyamides. In addition, thermocycling significantly decreased the elastic modulus of one of the polyamides and significantly increased the elastic moduli of one of the polyamides, the polyethylene terephthalat...
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effect of location of glass fiber reinforced composite reinforcement on the flexural properties of a maxillary complete denture in vitro
Acta Odontologica Scandinavica, 2011Co-Authors: Yutaka Takahashi, Kaneyoshi Yoshida, Hiroshi ShimizuAbstract:Objective. To evaluate the effect of the location of glass fiber-reinforced composite (FRC) reinforcement on the flexural load at the Proportional Limit (FL-PL) and the flexural deflection of a maxillary acrylic resin complete denture. Material and methods. Maxillary acrylic resin complete dentures strengthened with and without FRC reinforcement were tested. The polymerized FRC was embedded in the denture base resin in the doughy state and placed (1) under the ridge lap region, (2) in the anterior region, (3) in the middle region or (4) in the anterior and posterior regions. The FL-PL and flexural deflection value at the 100-N loading point of the reinforced maxillary denture specimens were tested. Results. All of the reinforced dentures had a higher FL-PL than the denture without reinforcement but the FL-PL values of all the dentures were not significantly different from each other. The efficiency of the FRC reinforcement compared to the unreinforced denture was 1.54-1.75 times greater. All of the reinforced dentures showed significantly lower deflection compared to the unreinforced denture, but the flexural deflections of all the dentures were not significantly different from each other. Conclusions. The location of the FRC reinforcement did not affect the fracture resistance of the maxillary acrylic resin complete denture. All of the reinforced dentures had higher FL-PL and lower flexural deflection than the denture without reinforcement.
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Reinforcing effect of glass-fiber-reinforced composite on flexural strength at the Proportional Limit of denture base resin
Acta Odontologica Scandinavica, 2009Co-Authors: Fumitake Tsue, Yutaka Takahashi, Hiroshi ShimizuAbstract:Objective. To evaluate the reinforcing effect of fiber-reinforced composite (FRC) on flexural strengths at the Proportional Limit (FS-PL) of a denture base resin. Material and methods. Bar-shaped acrylic resin specimens and maxillary acrylic resin complete denture specimens were fabricated. The FS-PL of the reinforced bar-shaped specimens was tested. Novel FRC, FibreKor, Remanium, Palatal Bar Wire, and Clasp-Wire were used as reinforcing materials. Likewise, the compressive strength at the Proportional Limit (CS-PL) of the reinforced maxillary denture specimens was tested. Results. The FS-PL of the bar-shaped specimens reinforced with the FRCs was significantly higher than that of the unreinforced specimenswithouwi. The FS-PL of the bar-shaped specimens reinforced with the 1.0-mm-thick FRC was similar to the FS-PL of specimens reinforced with Remanium or Palatal Bar Wire. The FS-PL of specimens reinforced with the 1.5-mm-thick FRC was significantly higher than with the metal-reinforcing materials. The rei...
Hirono Sasaki - One of the best experts on this subject based on the ideXlab platform.
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effect of reinforcement on the flexural properties of injection molded thermoplastic denture base resins
Journal of Prosthodontics, 2017Co-Authors: Hirono Sasaki, Ippei Hamanaka, Yutaka Takahashi, Tomohiro KawaguchiAbstract:Purpose To evaluate the effect of reinforcement on the flexural properties of injection-molded thermoplastic denture base resins. Materials and Methods Three injection-molded thermoplastic denture base resins (polyamide, polyester, polycarbonate) were selected for this study, and a conventional heat-polymerized denture base resin (PMMA) was used as a control. Continuous unidirectional glass fiber-reinforced composite (FRC) and metal wire were used for reinforcement. Reinforced bar-shaped specimens (65 mm long, 10 mm wide, 3.3 mm high) were fabricated (n = 10). The flexural strength at the Proportional Limit (FS-PL) and the elastic modulus were measured using a three-point bending test. Results All the denture base material specimens reinforced with FRC possessed a significantly higher FS-PL compared to those without reinforcement. The FS-PL of the polycarbonate specimens reinforced with metal wire was significantly higher than that without reinforcement, and there was no significant difference in the FS-PL between the polycarbonate specimens reinforced with FRC and those with metal wire. The order of the elastic modulus according to the denture base material, arranged in terms of statistical significance, was as follows: PMMA (3.46 ± 0.53 GPa) > polycarbonate (2.69 ± 0.48 GPa) > polyester (2.00 ± 0.39 GPa) > polyamide (1.14 ± 0.35 GPa). The order of the elastic modulus according to the reinforcement, arranged in terms of statistical significance, was as follows: metal wire (2.74 ± 0.96 GPa) > FRC (2.40 ± 0.89 GPa) > no reinforcement (1.82 ± 0.83 GPa). Conclusion Continuous unidirectional glass fiber-reinforced composite (FRC) reinforcement had a satisfactory reinforcing effect for the injection-molded thermoplastic denture base resins.
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Reinforcing effect of glass fiber-reinforced composite reinforcement on flexural strength at Proportional Limit of a repaired denture base resin
Acta biomaterialia odontologica Scandinavica, 2015Co-Authors: Kaneyoshi Yoshida, Hirono Sasaki, Tomohiro Kawaguchi, Ippei Hamanaka, Yutaka Takahashi, Hiroshi ShimizuAbstract:AbstractObjective: This study evaluated the reinforcing effect of glass fiber-reinforced composite (FRC) reinforcement on flexural strength at the Proportional Limit (FS-PL) of a repaired denture base resin.Materials and methods: Repaired denture base resins reinforced with metal and with FRC reinforcement, and that without reinforcement were tested. The ultimate flexural strength, the FS-PL and the elastic modulus of repaired denture base resins were tested. The joint efficiency (times) of the repaired denture base resins on the intact denture base resin was evaluated.Results: The repaired denture base resins reinforced with metal reinforcement and with FRC reinforcement had significantly higher ultimate flexural strength than the repaired denture base resin without reinforcement (p 0.05). The FS-PL of a repaired denture base resin reinforced with the FRC reinforcement was similar to that with the metal reinforcement (p > 0.05), and these ...
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reinforcing effect of glass fiber reinforced composite reinforcement on flexural strength at Proportional Limit of a repaired denture base resin
Acta biomaterialia odontologica Scandinavica, 2015Co-Authors: Kaneyoshi Yoshida, Hirono Sasaki, Tomohiro Kawaguchi, Ippei Hamanaka, Yutaka Takahashi, Hiroshi ShimizuAbstract:Objective: This study evaluated the reinforcing effect of glass fiber-reinforced composite (FRC) reinforcement on flexural strength at the Proportional Limit (FS-PL) of a repaired denture base resin. Materials and methods: Repaired denture base resins reinforced with metal and with FRC reinforcement, and that without reinforcement were tested. The ultimate flexural strength, the FS-PL and the elastic modulus of repaired denture base resins were tested. The joint efficiency (times) of the repaired denture base resins on the intact denture base resin was evaluated. Results: The repaired denture base resins reinforced with metal reinforcement and with FRC reinforcement had significantly higher ultimate flexural strength than the repaired denture base resin without reinforcement (p 0.05). The FS-PL of a repaired denture base resin reinforced with the FRC reinforcement was similar to that with the metal reinforcement (p > 0.05), and these were significantly higher than the FS-PL of a repaired denture base resin without reinforcement (p < 0.05). The elastic modulus of the repaired denture base resin reinforced with the FRC reinforcement was significantly lower than that with metal reinforcement (p < 0.05) and was significantly higher than that without reinforcement (p < 0.05). The joint efficiency of the FRC reinforced specimen was 0.98. Conclusion: The FRC reinforcement had a reinforcing effect on the FS-PL of a repaired denture base resin.
Ippei Hamanaka - One of the best experts on this subject based on the ideXlab platform.
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effect of reinforcement on the flexural properties of injection molded thermoplastic denture base resins
Journal of Prosthodontics, 2017Co-Authors: Hirono Sasaki, Ippei Hamanaka, Yutaka Takahashi, Tomohiro KawaguchiAbstract:Purpose To evaluate the effect of reinforcement on the flexural properties of injection-molded thermoplastic denture base resins. Materials and Methods Three injection-molded thermoplastic denture base resins (polyamide, polyester, polycarbonate) were selected for this study, and a conventional heat-polymerized denture base resin (PMMA) was used as a control. Continuous unidirectional glass fiber-reinforced composite (FRC) and metal wire were used for reinforcement. Reinforced bar-shaped specimens (65 mm long, 10 mm wide, 3.3 mm high) were fabricated (n = 10). The flexural strength at the Proportional Limit (FS-PL) and the elastic modulus were measured using a three-point bending test. Results All the denture base material specimens reinforced with FRC possessed a significantly higher FS-PL compared to those without reinforcement. The FS-PL of the polycarbonate specimens reinforced with metal wire was significantly higher than that without reinforcement, and there was no significant difference in the FS-PL between the polycarbonate specimens reinforced with FRC and those with metal wire. The order of the elastic modulus according to the denture base material, arranged in terms of statistical significance, was as follows: PMMA (3.46 ± 0.53 GPa) > polycarbonate (2.69 ± 0.48 GPa) > polyester (2.00 ± 0.39 GPa) > polyamide (1.14 ± 0.35 GPa). The order of the elastic modulus according to the reinforcement, arranged in terms of statistical significance, was as follows: metal wire (2.74 ± 0.96 GPa) > FRC (2.40 ± 0.89 GPa) > no reinforcement (1.82 ± 0.83 GPa). Conclusion Continuous unidirectional glass fiber-reinforced composite (FRC) reinforcement had a satisfactory reinforcing effect for the injection-molded thermoplastic denture base resins.
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Reinforcing effect of glass fiber-reinforced composite reinforcement on flexural strength at Proportional Limit of a repaired denture base resin
Acta biomaterialia odontologica Scandinavica, 2015Co-Authors: Kaneyoshi Yoshida, Hirono Sasaki, Tomohiro Kawaguchi, Ippei Hamanaka, Yutaka Takahashi, Hiroshi ShimizuAbstract:AbstractObjective: This study evaluated the reinforcing effect of glass fiber-reinforced composite (FRC) reinforcement on flexural strength at the Proportional Limit (FS-PL) of a repaired denture base resin.Materials and methods: Repaired denture base resins reinforced with metal and with FRC reinforcement, and that without reinforcement were tested. The ultimate flexural strength, the FS-PL and the elastic modulus of repaired denture base resins were tested. The joint efficiency (times) of the repaired denture base resins on the intact denture base resin was evaluated.Results: The repaired denture base resins reinforced with metal reinforcement and with FRC reinforcement had significantly higher ultimate flexural strength than the repaired denture base resin without reinforcement (p 0.05). The FS-PL of a repaired denture base resin reinforced with the FRC reinforcement was similar to that with the metal reinforcement (p > 0.05), and these ...
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reinforcing effect of glass fiber reinforced composite reinforcement on flexural strength at Proportional Limit of a repaired denture base resin
Acta biomaterialia odontologica Scandinavica, 2015Co-Authors: Kaneyoshi Yoshida, Hirono Sasaki, Tomohiro Kawaguchi, Ippei Hamanaka, Yutaka Takahashi, Hiroshi ShimizuAbstract:Objective: This study evaluated the reinforcing effect of glass fiber-reinforced composite (FRC) reinforcement on flexural strength at the Proportional Limit (FS-PL) of a repaired denture base resin. Materials and methods: Repaired denture base resins reinforced with metal and with FRC reinforcement, and that without reinforcement were tested. The ultimate flexural strength, the FS-PL and the elastic modulus of repaired denture base resins were tested. The joint efficiency (times) of the repaired denture base resins on the intact denture base resin was evaluated. Results: The repaired denture base resins reinforced with metal reinforcement and with FRC reinforcement had significantly higher ultimate flexural strength than the repaired denture base resin without reinforcement (p 0.05). The FS-PL of a repaired denture base resin reinforced with the FRC reinforcement was similar to that with the metal reinforcement (p > 0.05), and these were significantly higher than the FS-PL of a repaired denture base resin without reinforcement (p < 0.05). The elastic modulus of the repaired denture base resin reinforced with the FRC reinforcement was significantly lower than that with metal reinforcement (p < 0.05) and was significantly higher than that without reinforcement (p < 0.05). The joint efficiency of the FRC reinforced specimen was 0.98. Conclusion: The FRC reinforcement had a reinforcing effect on the FS-PL of a repaired denture base resin.
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effect of thermal shock on mechanical properties of injection molded thermoplastic denture base resins
Acta Odontologica Scandinavica, 2012Co-Authors: Yutaka Takahashi, Ippei Hamanaka, Hiroshi ShimizuAbstract:Abstract Objective. This study investigated the effect of thermal shock on the mechanical properties of injection-molded thermoplastic denture base resins. Materials and methods. Four thermoplastic resins (two polyamides, one polyethylene terephthalate, one polycarbonate) and, as a control, a conventional heat-polymerized polymethyl methacrylate (PMMA), were tested. Specimens of each denture base material were fabricated according to ISO 1567 and were either thermocycled or not thermocycled (n = 10). The flexural strength at the Proportional Limit (FS-PL), the elastic modulus and the Charpy impact strength of the denture base materials were estimated. Results. Thermocycling significantly decreased the FS-PL of one of the polyamides and the PMMA and it significantly increased the FS-PL of one of the polyamides. In addition, thermocycling significantly decreased the elastic modulus of one of the polyamides and significantly increased the elastic moduli of one of the polyamides, the polyethylene terephthalat...
