講演情報
[IO-4]Evaluation of Flexural strength of denture base resin using 3D printed zirconia mesh reinforcement
*Eun Bin Choi1, Chang Mo Jeong1, Mi Jung Yun1, Jung Bo Huh1, So Hyun Lee1, Dae Sung Kim1 (1. Pusan National University Prosthodontics)
[Introduction]
Removable dentures are a traditional and commonly used method for restoring function in edentulous patients, but they have limitations such as breakage. To overcome these limitations, various reinforcement materials have been studied. This study aims to evaluate the effectiveness of 3D printed zirconia as a reinforcement for denture resin. The study compares the flexural strength of dentures reinforced with zirconia to dentures without reinforcement and those reinforced with metal.
[Method]
Specimens were prepared using 3D printing with a heat-polymerizing denture resin (Vertex RS, Vertex Dental B.V., Netherlands). The reinforcements selected were Co-Cr metal (CCW-25, High Dental Korea) and zirconia (INNI-CERA, AON, Korea). The specimens were fabricated according to ISO 20795-1:2013 with dimensions of 64 x 10 x 3.3 mm. A control group of resin without reinforcement was compared to three experimental groups: metal-reinforced, zirconia-reinforced, and resin alone. Reinforcements were designed with a mesh structure featuring 2mm and 3mm holes using CAD-CAM software, and were placed centrally within the specimens. Molds were made using a gypsum mixture. The flexural strength of the specimens was tested using a universal testing machine (Instron 3345, USA) with a three-point bending test. Statistical analysis was performed using the Kolmogorov-Smirnov test and Scheffe test to evaluate the significance between the experimental groups. Fracture surfaces were observed using a scanning electron microscope.
[Results and Discussion]
The dentures with 3D printed zirconia reinforcement exhibited lower flexural strength compared to those reinforced with metal. While an increase in pore size tended to result in higher flexural strength, no statistically significant differences were found between groups.
[References]
1) Slade GD, Akinkugbe AA, Sanders AE. Projections of U.S. edentulism prevalence following 5 decades of decline. J Dent Res 2014;93(10):959–65.
2) Kattadiyil MT, AlHelal A, Goodacre BJ et al. Clinical complications with computer-engineered complete dentures. J Prosthet Dent 2017;117(6):721–12.
3) Minami H, Suzuki S, Kurashige H, et al. Flexural strengths of denture base resin repaired with autopolymerizing resin and reinforcements. J Prosthodont 2005;14:12-8.
Removable dentures are a traditional and commonly used method for restoring function in edentulous patients, but they have limitations such as breakage. To overcome these limitations, various reinforcement materials have been studied. This study aims to evaluate the effectiveness of 3D printed zirconia as a reinforcement for denture resin. The study compares the flexural strength of dentures reinforced with zirconia to dentures without reinforcement and those reinforced with metal.
[Method]
Specimens were prepared using 3D printing with a heat-polymerizing denture resin (Vertex RS, Vertex Dental B.V., Netherlands). The reinforcements selected were Co-Cr metal (CCW-25, High Dental Korea) and zirconia (INNI-CERA, AON, Korea). The specimens were fabricated according to ISO 20795-1:2013 with dimensions of 64 x 10 x 3.3 mm. A control group of resin without reinforcement was compared to three experimental groups: metal-reinforced, zirconia-reinforced, and resin alone. Reinforcements were designed with a mesh structure featuring 2mm and 3mm holes using CAD-CAM software, and were placed centrally within the specimens. Molds were made using a gypsum mixture. The flexural strength of the specimens was tested using a universal testing machine (Instron 3345, USA) with a three-point bending test. Statistical analysis was performed using the Kolmogorov-Smirnov test and Scheffe test to evaluate the significance between the experimental groups. Fracture surfaces were observed using a scanning electron microscope.
[Results and Discussion]
The dentures with 3D printed zirconia reinforcement exhibited lower flexural strength compared to those reinforced with metal. While an increase in pore size tended to result in higher flexural strength, no statistically significant differences were found between groups.
[References]
1) Slade GD, Akinkugbe AA, Sanders AE. Projections of U.S. edentulism prevalence following 5 decades of decline. J Dent Res 2014;93(10):959–65.
2) Kattadiyil MT, AlHelal A, Goodacre BJ et al. Clinical complications with computer-engineered complete dentures. J Prosthet Dent 2017;117(6):721–12.
3) Minami H, Suzuki S, Kurashige H, et al. Flexural strengths of denture base resin repaired with autopolymerizing resin and reinforcements. J Prosthodont 2005;14:12-8.