Purpose: This study compares the mechanical properties and wear ability of commercially available CAD/CAM (Computer Aided Design/Computer Aided Manufacturing) millable dental blocks.
Material & Method: Part I. All the discs including Vita Enamic, Lava Ultimate, and MAZIC Duro were cut in dimensi...
Purpose: This study compares the mechanical properties and wear ability of commercially available CAD/CAM (Computer Aided Design/Computer Aided Manufacturing) millable dental blocks.
Material & Method: Part I. All the discs including Vita Enamic, Lava Ultimate, and MAZIC Duro were cut in dimension of 1.2mm in thickness and 12mm in diameter, grinded up to #1200 Sic papers and polished. The biaxial flexure strength of the ceramic discs was measured after thermocycling treatment and the broken surfaces were observed using scanning electron microscopy (SEM). The discs were brushed using a toothbrush testing machine under a 150 g load. Surface roughness and morphology were determined after toothbrushing cycles. Finally, the friction and wear behavior of the materials against an opposing tooth were studied using a reciprocating pin-on-plate test configuration. The vertical loss of dental cusp was measured, and the surface image was examined using field emission scanning electron microscopy (FE-SEM). The biaxial flexural strength data was subjected to Weibull analysis. To compare the significance between the groups, all data were analyzed by one-way analysis (ANOVA). Part II. All the discs including Amber Mill Hybrid, Katana Avencia, Vita Enamic, Lava Ultimate, and Amber Mill were cut in dimension of 1.2mm in thickness and 12mm in diameter, polished to a machined surface and immersed in distilled water for 7 days. Vikers Hardness was measured and the broken surfaces were observed using microscope. Then the discs were brushed using a toothbrush testing machine under a 150 g load. Surface roughness and morphology were determined after toothbrushing 100,000 cycles. Finally the biaxial flexure strength of the discs was measured after thermocycling treatment and the broken surfaces were observed using scanning electron microscopy (SEM). The biaxial flexural strength data was subjected to Weibull analysis. To compare the significance between the groups, all data were analyzed by one-way analysis (ANOVA).
Result: Part I. The biaxial flexural strength of the Lava Ultimate and MAZIC Duro materials are significantly higher than that of Vita Enamic. In addition, Lava Ultimate and MAZIC Duro exhibited significantly smoother surfaces than that of Vita Enamic after toothbrushing. Lava Ultimate and MAZIC Duro also showed less wear to the opposing tooth than that of Vita Enamic. Part II. The results of Vickers hardness are shown in order from high to low: Amber Mill>Vita Enamic>Amber Mill Hybrid>Lava Ultimate>Katana Avencia, and there are significantly differences between any two groups. Regarding wear performance, Katana Avencia showed the highest volume percentage reduction and the roughest surface after toothbrushing, followed by Katana Avencia is Lava Ultimate. Two porous cross-linked composite resins exhibit a smaller volume percentage reduction and lower roughness after toothbrushing. Glass ceramic has the smoothest surface after toothbrushing. The biaxial flexural strength is in order from high to low: Amber Mill> Katana Avencia >Lava Ultimate >Amber Mill Hybrid>Vita Enamic.
Conclusion: Almost all important properties of composite resins are depend on using higher filler levels. The degree of filler addition is represented in terms of the weight percent or volume percent of filler. As the overall filler content increases, the physical, chemical, and mechanical properties generally improve. Another relevant property is the way they polymerized, usually the polymerization method will also have a large impact on the surface microstructure.
Purpose: This study compares the mechanical properties and wear ability of commercially available CAD/CAM (Computer Aided Design/Computer Aided Manufacturing) millable dental blocks.
Material & Method: Part I. All the discs including Vita Enamic, Lava Ultimate, and MAZIC Duro were cut in dimension of 1.2mm in thickness and 12mm in diameter, grinded up to #1200 Sic papers and polished. The biaxial flexure strength of the ceramic discs was measured after thermocycling treatment and the broken surfaces were observed using scanning electron microscopy (SEM). The discs were brushed using a toothbrush testing machine under a 150 g load. Surface roughness and morphology were determined after toothbrushing cycles. Finally, the friction and wear behavior of the materials against an opposing tooth were studied using a reciprocating pin-on-plate test configuration. The vertical loss of dental cusp was measured, and the surface image was examined using field emission scanning electron microscopy (FE-SEM). The biaxial flexural strength data was subjected to Weibull analysis. To compare the significance between the groups, all data were analyzed by one-way analysis (ANOVA). Part II. All the discs including Amber Mill Hybrid, Katana Avencia, Vita Enamic, Lava Ultimate, and Amber Mill were cut in dimension of 1.2mm in thickness and 12mm in diameter, polished to a machined surface and immersed in distilled water for 7 days. Vikers Hardness was measured and the broken surfaces were observed using microscope. Then the discs were brushed using a toothbrush testing machine under a 150 g load. Surface roughness and morphology were determined after toothbrushing 100,000 cycles. Finally the biaxial flexure strength of the discs was measured after thermocycling treatment and the broken surfaces were observed using scanning electron microscopy (SEM). The biaxial flexural strength data was subjected to Weibull analysis. To compare the significance between the groups, all data were analyzed by one-way analysis (ANOVA).
Result: Part I. The biaxial flexural strength of the Lava Ultimate and MAZIC Duro materials are significantly higher than that of Vita Enamic. In addition, Lava Ultimate and MAZIC Duro exhibited significantly smoother surfaces than that of Vita Enamic after toothbrushing. Lava Ultimate and MAZIC Duro also showed less wear to the opposing tooth than that of Vita Enamic. Part II. The results of Vickers hardness are shown in order from high to low: Amber Mill>Vita Enamic>Amber Mill Hybrid>Lava Ultimate>Katana Avencia, and there are significantly differences between any two groups. Regarding wear performance, Katana Avencia showed the highest volume percentage reduction and the roughest surface after toothbrushing, followed by Katana Avencia is Lava Ultimate. Two porous cross-linked composite resins exhibit a smaller volume percentage reduction and lower roughness after toothbrushing. Glass ceramic has the smoothest surface after toothbrushing. The biaxial flexural strength is in order from high to low: Amber Mill> Katana Avencia >Lava Ultimate >Amber Mill Hybrid>Vita Enamic.
Conclusion: Almost all important properties of composite resins are depend on using higher filler levels. The degree of filler addition is represented in terms of the weight percent or volume percent of filler. As the overall filler content increases, the physical, chemical, and mechanical properties generally improve. Another relevant property is the way they polymerized, usually the polymerization method will also have a large impact on the surface microstructure.
주제어
#Composite resin lithium disilicate glass ceramic hardness biaxial flexural strength surface roughness wear test
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