Microf racture Mechanisms of Dental Resin Composites Containing Spherically-shaped Filler Particles
Microf racture Mechanisms of Dental Resin Composites Containing Spherically-shaped Filler Particles
复制标题
含有球形填料颗粒的牙科树脂复合材料的微断裂机制
DOI：
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发表时间：
1994
期刊：
影响因子：
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通讯作者：
T. Kishi
中科院分区：
文献类型：
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作者：
K. Kim;J. Park;Y. Imai;T. Kishi
研究了球形填料颗粒对树脂基复合材料弯曲强度、弯曲弹性模量和断裂韧性的影响。填料含量改变0、20、40、60和70重量%。在三点弯曲试样上测定弯曲性能和断裂韧性。声发射（AE），即，在断裂韧性测试期间，通过高灵敏度和低噪声共振型传感器检测从材料中的局部源释放的弹性波。分析检测到的声发射信号的参数，如幅度，事件和位置。用扫描电子显微镜检查了断裂表面。抗弯强度和断裂韧性随填料含量的变化趋势基本一致，但弹性模量随填料含量的变化幅度较大。根据AE释放模式、二维AE位置和断裂表面结果，提出了含球形填料颗粒的牙科树脂复合材料的微断裂机制。除了在通常的商业树脂复合材料中观察到的裂纹钉扎和裂纹分支的增韧效果之外，在这种新型的牙科树脂复合材料中确认了裂纹偏转效果。
The effects of spherically-shaped filler particles on bending strength, bending elastic modulus, and fracture toughness of resin composites were studied. The filler content was changed by 0, 20, 40, 60, and 70 wt%. Bending properties and fracture toughnesses were determined on three-point bending specimens. Acoustic Emission (AE), i.e., the elastic wave released from a localized source in the material, was detected by sensors of a high-sensitivity and low-noise resonance type during the fracture toughness test. Detected acoustic emission signals were analyzed for parameters such as amplitude, events, and locations. The fractured surf ace was examined by a scanning electron microscope. The bending strength and the fracture toughness showed almost the same trend in their increasing rates by filler content, but the elastic modulus showed a much higher increasing rate. A microfracture mechanism of the dental resin composites containing spherically-shaped filler particles is proposed based on the results obtained from the AE-releasing pattern, two-dimensional AE location, and fracture surface findings. In addition to the toughening effects of crack pinning and crack branching, which are observed in the usual commercial resin composites, crack-deflecting effects are confirmed in this new type of dental resin composites.