Photocure fiber-reinforced composites (FRCs) with varying chopped quartz-fiber lengths were incorporated into a dental photocure zirconia-silicate particulate-filled composite (PFC) for mechanical test comparisons with a popular commercial spherical-particle amalgam. FRC lengths included 0.5-mm, 1.0 mm, 2.0 mm, and 3.0 mm all at a constant 28.2 volume percent. Four-point fully articulated fixtures were used according to American Standards Test Methods with sample dimensions of 2×2×50 mm3 across a 40 mm span to provide sufficient Euler flexural bending and prevent top-load compressive shear error. Mechanical properties for flexural strength, modulus, yield strength, resilience, work of fracture, critical strain energy release, critical stress intensity factor, and strain were obtained for comparison. Fiber length subsequently correlated with increasing all mechanical properties, p < 1.1×10-5. Although the modulus was significantly statistically higher for amalgam than all composites, all FRCs and even the PFC had higher values than amalgam for all other mechanical properties. Because amalgams provide increased longevity during clinical use compared to the standard PFCs, modulus would appear to be a mechanical property that might sufficiently reduce margin interlaminar shear stress and strain-related microcracking that could reduce failure rates. Also, since FRCs were tested with all mechanical properties that statistically significantly increased over the PFC, new avenues for future development could be provided toward surpassing amalgam in clinical longevity.
将具有不同石英纤维长度的光固化纤维增强复合材料(FRCs)加入到牙科光固化锆硅酸盐颗粒填充复合材料(PFC)中，与流行的商用球颗粒汞合金进行力学测试比较。FRC长度包括0.5 mm, 1.0 mm, 2.0 mm和3.0 mm，均在恒定的28.2%体积百分比下。根据美国标准测试方法，采用四点全铰接夹具，样品尺寸为2×2×50 mm3，跨度为40 mm，以提供足够的欧拉弯曲弯曲，并防止顶载压缩剪切误差。得到抗弯强度、模量、屈服强度、回弹性、断裂功、临界应变能释放、临界应力强度因子、应变等力学性能进行比较。纤维长度随后与增加的所有力学性能相关，p < 1.1×10-5。尽管汞合金的模量在统计上明显高于所有复合材料，但在所有其他力学性能方面，所有FRCs甚至PFC的数值都高于汞合金。由于与标准的全氟碳化物相比，汞合金在临床使用期间提供了更长的使用寿命，模量似乎是一种机械性能，可以充分降低边缘层间剪切应力和应变相关的微裂纹，从而降低故障率。此外，由于FRCs的所有机械性能在统计上都比PFC显著增加，因此可以为未来的发展提供新的途径，以超越汞合金的临床寿命。
{"title":"Mechanical Properties Comparing Composite Fiber Length to Amalgam.","authors":"Richard C. Petersen, Perng‐Ru Liu","doi":"10.1155/2016/3823952","DOIUrl":"https://doi.org/10.1155/2016/3823952","url":null,"abstract":"Photocure fiber-reinforced composites (FRCs) with varying chopped quartz-fiber lengths were incorporated into a dental photocure zirconia-silicate particulate-filled composite (PFC) for mechanical test comparisons with a popular commercial spherical-particle amalgam. FRC lengths included 0.5-mm, 1.0 mm, 2.0 mm, and 3.0 mm all at a constant 28.2 volume percent. Four-point fully articulated fixtures were used according to American Standards Test Methods with sample dimensions of 2×2×50 mm3 across a 40 mm span to provide sufficient Euler flexural bending and prevent top-load compressive shear error. Mechanical properties for flexural strength, modulus, yield strength, resilience, work of fracture, critical strain energy release, critical stress intensity factor, and strain were obtained for comparison. Fiber length subsequently correlated with increasing all mechanical properties, p < 1.1×10-5. Although the modulus was significantly statistically higher for amalgam than all composites, all FRCs and even the PFC had higher values than amalgam for all other mechanical properties. Because amalgams provide increased longevity during clinical use compared to the standard PFCs, modulus would appear to be a mechanical property that might sufficiently reduce margin interlaminar shear stress and strain-related microcracking that could reduce failure rates. Also, since FRCs were tested with all mechanical properties that statistically significantly increased over the PFC, new avenues for future development could be provided toward surpassing amalgam in clinical longevity.","PeriodicalId":91733,"journal":{"name":"Journal of composites","volume":"441 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2016-03-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"76331367","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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