摘要
目的:采用体外研究方法 ,比较3种可切削树脂陶瓷复合材料的挠曲性能、断裂韧性及硬度。方法 :选择UpceraHyramic、3M Lava Ultimate、Vita Enamic和对照组玻璃陶瓷Vitablocs MarkⅡ,分别制作成长、宽、高为16 mm×4 mm×1.0 mm、2.0 mm的挠曲强度实验试件,17 mm×4 mm×3 mm的断裂韧性实验试件和厚度为4 mm的硬度实验试件。应用万能实验机以0.5 mm/min的加载速度,测量并计算试件挠曲强度值和断裂韧性值;应用显微硬度仪测量并计算硬度值;扫描电镜观察试件断面粗糙程度。采用SPSS17.0软件包对实验数据进行单因素方差分析。结果:厚度1 mm时,各组挠曲强度值为Hyramic(207.7515±13.12) MPa>Vita Enamic(182.0286±15.18)MPa>Lava Ultimate(145.8469±8.98)MPa>Vitablocs MarkⅡ(103.0542±18.19)MPa;挠曲模量为Vitablocs MarkⅡ(49.49±5.50)GPa>Vita Enamic(40.65±3.80)GPa>Hyramic (14.89±2.38)GPa>Lava Ultimate (7.09±1.24)GPa。厚度2 mm时,各组挠曲强度值为Hyramic (208.1986±25.07)MPa>Lava Ultimate (172.9297±12.73) MPa>Vitablocs MarkⅡ(158.6587±15.37)MPa>VitaEnamic(155.3670±13.77)MPa;挠曲模量为Vitablocs MarkⅡ(24.07±1.86)GPa>Vita Enamic(19.64±0.98)GPa>Hyramic(10.35±0.87)GPa>Lava Ultimate (8.68±0.86)GPa。断裂韧性为Vita Enamic (1.6357±0.16)MPa·m^(1/2)>Lava Ultimate(1.4286±0.11)MPa·m^(1/2)>Vitablocs MarkⅡ(1.3233±0.10)MPa·m^(1/2)>Hyramic(1.0614±0.09) MPa·m^(1/2)。各实验组硬度均显著低于对照组。结论:根据ISO 6872/2008,3种可切削树脂陶瓷复合材料均满足临床强度需要。其中,Hyramic在不同厚度条件下都表现出了较高的挠曲强度,是比较理想的后牙修复材料;而Vita Enamic在1 mm时具有更高的机械强度,且韧性好,适用于后牙咬合空间有限且咬合力较大的患者的修复,即(牙合)贴面。
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, 3 M 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 Hyramic(207.7515±13.12)MPa>Vita Enamic(182.0286±15.18)MPa>Lava Ultimate(145.8469±8.98)MPa>Vitablocs MarkⅡ(103.0542±18.19)MPa.The mean flexural modulus were Vitablocs MarkⅡ(49.49±5.50)GPa>Vita Enamic(40.65±3.80)GPa>Hyramic(14.89±2.38)GPa>Lava Ultimate(7.09±1.24)GPa. The mean flexural strength of the tested blocks at 2 mm thickness was Hyramic(208.1986±25.07)MPa>Lava Ultimate(172.9297±12.73)MPa>Vitablocs MarkⅡ(158.6587±15.37) MPa>Vita Enamic(155.3670±13.77)MPa. The mean flexural modulus were Vitablocs MarkⅡ(24.07±1.86)GPa>Vita Enamic(19.64±0.98)GPa>Hyramic(10.35±0.87)GPa>Lava Ultimate(8.68±0.86)GPa. The mean fracture toughness was Vita Enamic(1.6357±0.16)MPa·m1/2>Lava Ultimate(1.4286±0.11)MPa·m1/2>Vitablocs MarkII(1.3233±0.10)MPa·m1/2>Hyramic(1.0614±0.09)MPa ·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 h
作者
刘丽杨
郭佳杰
杜亚鑫
王强
仇丽鸿
LIU Li -yang;GUO Jia-jie;DU Ya-xin;WANG Qiang;QIU Li -hong(Liaoning Research Center of Oral Disease Translational Medicine.Shenyang 110002,Liaoning Province,China)
出处
《上海口腔医学》
CAS
CSCD
北大核心
2019年第1期25-29,共5页
Shanghai Journal of Stomatology
关键词
可切削树脂陶瓷复合材料
挠曲性能
断裂韧性
硬度
Machinable resin ceramic composite materials
Flexural properties
Fracture toughness
Hardness
