[Comparison of mechanical properties of three machinable resin ceramic composite materials].
Shanghai Kou Qiang Yi Xue
; 28(1): 25-29, 2019 Feb.
Article
en Zh
| MEDLINE
| ID: mdl-31080995
ABSTRACT
PURPOSE:
This in vitro study was to compare the flexural properties, fracture toughness and hardness of three machinable composite materials.METHODS:
Three kinds of resin composite ceramic Upcera Hyramic, 3M Lava Ultimate, Vita Enamic and a glass ceramic Vitablocs Mark II were chosen for the study. Bar-shaped specimens (16 mm×4 mm×1 mm, 2 mm) were prepared for flexural strength experiment; specimens (17 mm×4 mm×3 mm) were prepared for fracture toughness experiment and specimens of 4 mm thickness were prepared for hardness test. Flexural test and fracture toughness experiment were performed with an universal testing machine at a cross-head speed of 0.5 mm/min. Hardness test was performed with an micro hardness tester.Scanning electron microscope was used to observe the roughness of fracture surface. One-way variance analysis was used to determine the statistical differences with SPSS 17.0 software package.RESULTS:
The mean flexural strength of the tested blocks at 1 mm thickness was Hyramicï¼207.7515±13.12ï¼MPaï¼Vita Enamicï¼182.0286±15.18ï¼MPaï¼Lava Ultimateï¼145.8469±8.98ï¼MPaï¼Vitablocs Markâ ¡ï¼103.0542±18.19ï¼MPa. The mean flexural modulus were Vitablocs Markâ ¡ï¼49.49±5.50ï¼GPaï¼Vita Enamicï¼40.65±3.80ï¼GPaï¼Hyramicï¼14.89±2.38ï¼GPaï¼Lava Ultimateï¼7.09±1.24ï¼GPa. The mean flexural strength of the tested blocks at 2 mm thickness was Hyramicï¼208.1986±25.07ï¼MPaï¼Lava Ultimateï¼172.9297±12.73ï¼MPaï¼Vitablocs Markâ ¡ï¼158.6587±15.37ï¼ MPaï¼Vita Enamicï¼155.3670±13.77ï¼MPa. The mean flexural modulus were Vitablocs Markâ ¡ï¼24.07±1.86ï¼GPaï¼Vita Enamicï¼19.64±0.98ï¼GPaï¼Hyramicï¼10.35±0.87ï¼GPaï¼Lava Ultimateï¼8.68±0.86ï¼GPa. The mean fracture toughness was Vita Enamicï¼1.6357±0.16ï¼MPa·m1/2ï¼Lava Ultimateï¼1.4286±0.11ï¼MPa·m1/2>Vitablocs MarkIIï¼1.3233±0.10ï¼MPa·m1/2>Hyramicï¼1.0614±0.09ï¼MPa·m1/2. The hardness of the experimental group was significantly lower than that of the control group.CONCLUSIONS:
According to ISO 6872/2008, three kinds of machinable resin ceramic composites meet the needs of clinical strength.Hyramic showed higher flexural strength at different thickness, it is an ideal material for dental restoration. Vita Enamic has not only higher flexural strength at the thickness of 1 mm, but also good toughness, it is suitable for repair of patients that have limited occlusal space and great bite force, named occlusal veneer.
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Banco de datos:
MEDLINE
Asunto principal:
Cerámica
/
Resinas Compuestas
Límite:
Humans
Idioma:
Zh
Año:
2019
Tipo del documento:
Article