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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, Tomohiro Kawaguchi, Ippei Hamanaka, Yutaka Takahashi, Hirono SasakiAbstract: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, Tomohiro Kawaguchi, Ippei Hamanaka, Yutaka Takahashi, Hirono SasakiAbstract: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 HamanakaAbstract: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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Mechanical properties of injection-molded thermoplastic Denture Base resins
Acta Odontologica Scandinavica, 2010Co-Authors: Ippei Hamanaka, Yutaka TakahashiAbstract:Abstract Objective. To investigate the mechanical properties of injection-molded thermoplastic Denture Base resins. Material and methods. Four injection-molded thermoplastic resins (two polyamides, one polyethylene terephthalate, one polycarbonate) and, as a control, a conventional heat-polymerized polymethyl methacrylate (PMMA), were used in this study. The flexural strength at the proportional limit (FS-PL), the elastic modulus, and the Charpy impact strength of the Denture Base resins were measured according to International Organization for Standardization (ISO) 1567 and ISO 1567:1999/Amd 1:2003. Results. The descending order of the FS-PL was: conventional PMMA > polyethylene terephthalate, polycarbonate > two polyamides. The descending order of the elastic moduli was: conventional PMMA > polycarbonate > polyethylene terephthalate > two polyamides. The descending order of the Charpy impact strength was: polyamide (Nylon PACM12) > polycarbonate > polyamide (Nylon 12), polyethylene terephthalate > conve...
Marco Antonio Compagnoni - One of the best experts on this subject based on the ideXlab platform.
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evaluation of the bond strength of Denture Base resins to acrylic resin teeth effect of thermocycling
Journal of Prosthodontics, 2009Co-Authors: D B Barbosa, Raphael Freitas De Souza, Ana Carolina Pero, Julie Marra, Marco Antonio CompagnoniAbstract:Purpose: The purpose of this study was to evaluate the thermocycling effects and shear bond strength of acrylic resin teeth to Denture Base resins. Materials and Methods: Three acrylic teeth (Biotone, Trilux, Ivoclar) were chosen for bonding to four Denture Base resins: microwave-polymerized (Acron MC), heat-polymerized (Lucitone 550 and QC-20), and light-polymerized (Versyo.bond). Twenty specimens were produced for each Denture Base/acrylic tooth combination and were divided into two groups (n = 10): without thermocycling (control groups) and thermocycled groups submitted to 5000 cycles between 4 and 60°C. Shear strength tests (MPa) were performed with a universal testing machine at a crosshead speed of 1 mm/min. Statistical analysis of the results was carried out with three-way ANOVA and Bonferroni's multiple comparisons post hoc analysis for test groups (α= 0.05). Results: The shear bond strengths of Lucitone/Biotone, Lucitone/Trilux, and Versyo/Ivoclar specimens were significantly decreased by thermocycling, compared with the corresponding control groups (p < 0.05). The means of Acron/Ivoclar and Lucitone/Ivoclar specimens increased after thermocycling (p < 0.05). The highest mean shear bond strength value was observed with Lucitone/Biotone in the control group (14.54 MPa) and the lowest with QC-20/Trilux in the thermocycled group (3.69 MPa). Conclusion: Some acrylic tooth/Denture Base resin combinations can be more affected by thermocycling; effects vary Based upon the materials used.
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the effect of polymerization cycles on porosity of microwave processed Denture Base resin
Journal of Prosthetic Dentistry, 2004Co-Authors: Marco Antonio Compagnoni, D B Barbosa, Raphael Freitas De Souza, Ana Carolina PeroAbstract:STATEMENT OF PROBLEM: Although most of the physical properties of Denture Base resin polymerized by microwave energy have been shown to be similar to resins polymerized by the conventional heat polymerization method, the presence of porosity is a problem. PURPOSE: This study evaluated the effect of different microwave polymerization cycles on the porosity of a Denture Base resin designed for microwave polymerization. MATERIAL AND METHODS: Thirty-two rectangular resin specimens (65 x 40 x 5 mm) were divided into 3 experimental groups (A, B, and C; Onda-Cryl, microwave-polymerized resin) and 1 control group (T; Classico, heat-polymerized resin), according to the following polymerization cycles: (A) 500 W for 3 minutes, (B) 90 W for 13 minutes+500 W for 90 seconds, (C) 320 W for 3 minutes+0 W for 4 minutes+720 W for 3 minutes, and (T) 74 degrees C for 9 hours. Porosity was calculated by measurement of the specimen volume before and after its immersion in water. Data were analyzed using 1-way analysis of variance (alpha=.05). RESULTS: The mean values and SDs of the percent mean porosity were: A=1.05%+/-0.28%, B=0.91%+/-0.15%, C=0.88%+/-0.23%, T=0.93%+/-0.23%. No significant differences were found in mean porosity among the groups evaluated. CONCLUSION: Within the limitations of this study, a Denture Base resin specifically designed for microwave polymerization tested was not affected by different polymerization cycles. Porosity was similar to the conventional heat-polymerized Denture Base resin tested.
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The effect of polymerization cycles on porosity of microwave-processed Denture Base resin
Journal of Prosthetic Dentistry, 2004Co-Authors: Marco Antonio Compagnoni, D B Barbosa, Raphael Freitas De Souza, Ana Carolina PeroAbstract:Abstract Statement of problem Although most of the physical properties of Denture Base resin polymerized by microwave energy have been shown to be similar to resins polymerized by the conventional heat polymerization method, the presence of porosity is a problem. Purpose This study evaluated the effect of different microwave polymerization cycles on the porosity of a Denture Base resin designed for microwave polymerization. Material and methods Thirty-two rectangular resin specimens (65×40×5 mm) were divided into 3 experimental groups (A, B, and C; Onda-Cryl, microwave-polymerized resin) and 1 control group (T; Classico, heat-polymerized resin), according to the following polymerization cycles: (A) 500 W for 3 minutes, (B) 90 W for 13 minutes + 500 W for 90 seconds, (C) 320 W for 3 minutes + 0 W for 4 minutes + 720 W for 3 minutes, and (T) 74°C for 9 hours. Porosity was calculated by measurement of the specimen volume before and after its immersion in water. Data were analyzed using 1-way analysis of variance (α = .05). Results The mean values and SDs of the percent mean porosity were: A = 1.05%±0.28%, B = 0.91%±0.15%, C = 0.88%±0.23%, T = 0.93%±0.23%. No significant differences were found in mean porosity among the groups evaluated. Conclusion Within the limitations of this study, a Denture Base resin specifically designed for microwave polymerization tested was not affected by different polymerization cycles. Porosity was similar to the conventional heat-polymerized Denture Base resin tested.
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, Tomohiro Kawaguchi, Ippei Hamanaka, Yutaka Takahashi, Hirono SasakiAbstract: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, Tomohiro Kawaguchi, Ippei Hamanaka, Yutaka Takahashi, Hirono SasakiAbstract: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 HamanakaAbstract: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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Mechanical properties of injection-molded thermoplastic Denture Base resins
Acta Odontologica Scandinavica, 2010Co-Authors: Ippei Hamanaka, Yutaka TakahashiAbstract:Abstract Objective. To investigate the mechanical properties of injection-molded thermoplastic Denture Base resins. Material and methods. Four injection-molded thermoplastic resins (two polyamides, one polyethylene terephthalate, one polycarbonate) and, as a control, a conventional heat-polymerized polymethyl methacrylate (PMMA), were used in this study. The flexural strength at the proportional limit (FS-PL), the elastic modulus, and the Charpy impact strength of the Denture Base resins were measured according to International Organization for Standardization (ISO) 1567 and ISO 1567:1999/Amd 1:2003. Results. The descending order of the FS-PL was: conventional PMMA > polyethylene terephthalate, polycarbonate > two polyamides. The descending order of the elastic moduli was: conventional PMMA > polycarbonate > polyethylene terephthalate > two polyamides. The descending order of the Charpy impact strength was: polyamide (Nylon PACM12) > polycarbonate > polyamide (Nylon 12), polyethylene terephthalate > conve...
D B Barbosa - One of the best experts on this subject based on the ideXlab platform.
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evaluation of the bond strength of Denture Base resins to acrylic resin teeth effect of thermocycling
Journal of Prosthodontics, 2009Co-Authors: D B Barbosa, Raphael Freitas De Souza, Ana Carolina Pero, Julie Marra, Marco Antonio CompagnoniAbstract:Purpose: The purpose of this study was to evaluate the thermocycling effects and shear bond strength of acrylic resin teeth to Denture Base resins. Materials and Methods: Three acrylic teeth (Biotone, Trilux, Ivoclar) were chosen for bonding to four Denture Base resins: microwave-polymerized (Acron MC), heat-polymerized (Lucitone 550 and QC-20), and light-polymerized (Versyo.bond). Twenty specimens were produced for each Denture Base/acrylic tooth combination and were divided into two groups (n = 10): without thermocycling (control groups) and thermocycled groups submitted to 5000 cycles between 4 and 60°C. Shear strength tests (MPa) were performed with a universal testing machine at a crosshead speed of 1 mm/min. Statistical analysis of the results was carried out with three-way ANOVA and Bonferroni's multiple comparisons post hoc analysis for test groups (α= 0.05). Results: The shear bond strengths of Lucitone/Biotone, Lucitone/Trilux, and Versyo/Ivoclar specimens were significantly decreased by thermocycling, compared with the corresponding control groups (p < 0.05). The means of Acron/Ivoclar and Lucitone/Ivoclar specimens increased after thermocycling (p < 0.05). The highest mean shear bond strength value was observed with Lucitone/Biotone in the control group (14.54 MPa) and the lowest with QC-20/Trilux in the thermocycled group (3.69 MPa). Conclusion: Some acrylic tooth/Denture Base resin combinations can be more affected by thermocycling; effects vary Based upon the materials used.
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the effect of polymerization cycles on porosity of microwave processed Denture Base resin
Journal of Prosthetic Dentistry, 2004Co-Authors: Marco Antonio Compagnoni, D B Barbosa, Raphael Freitas De Souza, Ana Carolina PeroAbstract:STATEMENT OF PROBLEM: Although most of the physical properties of Denture Base resin polymerized by microwave energy have been shown to be similar to resins polymerized by the conventional heat polymerization method, the presence of porosity is a problem. PURPOSE: This study evaluated the effect of different microwave polymerization cycles on the porosity of a Denture Base resin designed for microwave polymerization. MATERIAL AND METHODS: Thirty-two rectangular resin specimens (65 x 40 x 5 mm) were divided into 3 experimental groups (A, B, and C; Onda-Cryl, microwave-polymerized resin) and 1 control group (T; Classico, heat-polymerized resin), according to the following polymerization cycles: (A) 500 W for 3 minutes, (B) 90 W for 13 minutes+500 W for 90 seconds, (C) 320 W for 3 minutes+0 W for 4 minutes+720 W for 3 minutes, and (T) 74 degrees C for 9 hours. Porosity was calculated by measurement of the specimen volume before and after its immersion in water. Data were analyzed using 1-way analysis of variance (alpha=.05). RESULTS: The mean values and SDs of the percent mean porosity were: A=1.05%+/-0.28%, B=0.91%+/-0.15%, C=0.88%+/-0.23%, T=0.93%+/-0.23%. No significant differences were found in mean porosity among the groups evaluated. CONCLUSION: Within the limitations of this study, a Denture Base resin specifically designed for microwave polymerization tested was not affected by different polymerization cycles. Porosity was similar to the conventional heat-polymerized Denture Base resin tested.
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The effect of polymerization cycles on porosity of microwave-processed Denture Base resin
Journal of Prosthetic Dentistry, 2004Co-Authors: Marco Antonio Compagnoni, D B Barbosa, Raphael Freitas De Souza, Ana Carolina PeroAbstract:Abstract Statement of problem Although most of the physical properties of Denture Base resin polymerized by microwave energy have been shown to be similar to resins polymerized by the conventional heat polymerization method, the presence of porosity is a problem. Purpose This study evaluated the effect of different microwave polymerization cycles on the porosity of a Denture Base resin designed for microwave polymerization. Material and methods Thirty-two rectangular resin specimens (65×40×5 mm) were divided into 3 experimental groups (A, B, and C; Onda-Cryl, microwave-polymerized resin) and 1 control group (T; Classico, heat-polymerized resin), according to the following polymerization cycles: (A) 500 W for 3 minutes, (B) 90 W for 13 minutes + 500 W for 90 seconds, (C) 320 W for 3 minutes + 0 W for 4 minutes + 720 W for 3 minutes, and (T) 74°C for 9 hours. Porosity was calculated by measurement of the specimen volume before and after its immersion in water. Data were analyzed using 1-way analysis of variance (α = .05). Results The mean values and SDs of the percent mean porosity were: A = 1.05%±0.28%, B = 0.91%±0.15%, C = 0.88%±0.23%, T = 0.93%±0.23%. No significant differences were found in mean porosity among the groups evaluated. Conclusion Within the limitations of this study, a Denture Base resin specifically designed for microwave polymerization tested was not affected by different polymerization cycles. Porosity was similar to the conventional heat-polymerized Denture Base resin tested.
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, Tomohiro Kawaguchi, Ippei Hamanaka, Yutaka Takahashi, Hirono SasakiAbstract: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, Tomohiro Kawaguchi, Ippei Hamanaka, Yutaka Takahashi, Hirono SasakiAbstract: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.