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首页> 外文期刊>Journal of biomedical materials research. Part B, Applied biomaterials. >Whisker-reinforced dental core buildup composites: Effect of filler level on mechanical properties
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Whisker-reinforced dental core buildup composites: Effect of filler level on mechanical properties

机译：晶须增强的牙核堆积复合材料：填料含量对机械性能的影响

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摘要

The strength and toughness of dental core buildup composites in large stress-bearing restorations need to be improved to reduce the incidence of fracture due to stresses from chewing and clenching. The aims of the present study were to develop novel core buildup composites reinforced with ceramic whiskers, to examine the effect of filler level, and to investigate the reinforcement mechanisms. Silica particles were fused onto the whiskers to facilitate silanization and to roughen the whisker surface for improved retention in the matrix. Filler level was varied from 0 to 70 percent. Flexural strength, compressive strength, and fracture toughness of the composites were measured. A nanoindentation system was used to measure elastic modulus and hardness. Scanning electron microscopy (SEM) was used to examine the fracture surfaces of specimens. Whisker filler level had significant effects on composite properties. The flexural strength in MPa (mean +- SD; n = 6) increased from (95 +-15) for the unfilled resin to (193 +- 8) for the composite with 50 percent filler level, then slightly decreased to (176 +- 12) at 70 percent filler level. The compressive strength increased from (149 +- 33) for the unfilled resin to (282 +-48) at 10 percent filler level, and remained equivalent from 10 to 70 percent filler level. Both the modulus and hardness increased monotonically with filler level. In conclusion, silica particle-fused ceramic single-crystalline whiskers significantly reinforced dental core buildup composites. The reinforcement mechanisms appeared to be crack deflection and bridging by the whiskers. Whisker filler level had significant effects on the flexural strength, compressive strength, elastic modulus, and hardness of composites.
机译：需要改善大型承压修复物中牙核堆积复合材料的强度和韧性，以减少由于咀嚼和咬合应力导致的骨折发生率。本研究的目的是开发用陶瓷晶须增强的新型芯堆积复合材料，以检查填料含量的影响并研究增强机理。将二氧化硅颗粒熔合到晶须上，以促进硅烷化并使晶须表面变粗糙，以改善在基质中的保留率。填充水平从0％到70％不等。测量了复合材料的弯曲强度，抗压强度和断裂韧性。纳米压痕系统用于测量弹性模量和硬度。扫描电子显微镜（SEM）用于检查样品的断裂表面。晶须填料含量对复合材料性能有显着影响。以MPa计的挠曲强度（平均值±SD; n = 6）从未填充树脂的（95 + -15）增加到填料含量为50％的复合材料的（193 +-8），然后略微降低至（176 + -12）填充水平为70％。填充强度为10％时，抗压强度从未填充树脂的（149 + -33）增至（282 + -48），并从10％增至70％。模量和硬度均随填料含量单调增加。总之，二氧化硅颗粒熔融陶瓷单晶须明显增强了牙核堆积复合材料。增强机制似乎是晶须的裂纹偏转和桥接。晶须填料含量对复合材料的挠曲强度，抗压强度，弹性模量和硬度有显着影响。

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