The influence of fibre placement and position on the efficiency of reinforcement of fibre reinforced composite bridgework
The influence of fibre placement and position on the efficiency of reinforcement of fibre reinforced composite bridgework
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DOI：
10.1046/j.1365-2842.2001.00792.x
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发表时间：
2001-08-01
影响因子：
2.9
通讯作者：
Marquis, PM
中科院分区：
文献类型：
--
作者：
Ellakwa, AE;Shortall, AC;Marquis, PM
研究了超高分子量聚乙烯（UHMWPE）纤维的放置对直接牙科复合材料弯曲性能和抗断裂性能的影响。超高分子量聚乙烯纤维越来越多地用于增强实验室制造的树脂复合冠和桥架。本研究的目的是评估一个常用的实验室制造变量对模拟三单元固定桥的梁形试件的体外强度的影响。制备4组Herculite XRV，每组10个试件，进行超高分子量聚乙烯纤维增强后的抗弯模量和强度测试。两组对照标本均不加纤维加固。一半的标本组在蒸馏水中保存，其他组在37度下干燥保存2周。本研究的结果表明，与未增强的对照试件组相比，在拉伸侧放置纤维或稍微远离拉伸侧的纤维改善了复合材料的弯曲性能，而破坏模式因纤维位置而异。扫描电子显微镜（SEM）研究表明，稍微远离拉伸侧的纤维放置有利于树脂内的裂纹发育和扩展，除了平行于纤维放置方向的脱粘外，还可以桥接纤维间空间。实验室制造变量可能会显著影响纤维增强桥梁结构的强度。
The effect of placement of ultra-high molecular weight polyethylene (UHMWPE) fibres on the flexural properties and fracture resistance of a direct dental composite was investigated. The UHMWPE fibres are increasingly being used for the reinforcement of laboratory fabricated resin composite crown and bridgework. The aim of this study was to assess the effect of a commonly used laboratory fabrication variable on the in vitro strength of beam shaped specimen simulating a three-unit fixed bridge. Four groups (10 specimens per group) of Herculite XRV were prepared for flexural modulus and strength testing after reinforcement with UHMWPE fibres. Two groups of control specimens were prepared without any fibre reinforcement. Half the specimen groups were stored in distilled water and the other groups were stored dry, both at 37 degreesC for 2 weeks before testing. The results of this study showed that placement of fibre at or slightly away from the tensile side improved the flexural properties of the composite in comparison with the unreinforced control specimen groups whilst the mode of failure differed according to fibre position. Scanning electron microscope (SEM) investigation revealed that placement of the fibre slightly away from the tensile side favoured crack development and propagation within the resin bridging the interfibre spaces in addition to debonding parallel to the direction of fibre placement. Laboratory fabrication variables may effect the strength of fibre reinforced bridgework significantly.