Bae J M, Kim K N, Hattori M, Hasegawa K, Yoshinari M, Kawada E, Oda Y
Department of Dental Materials, College of Dentistry, Yonsei University, Seoul, Korea.
Int J Prosthodont. 2001 Jan-Feb;14(1):33-9.
The aim of this study was to measure the flexural strength and the elastic modulus of composite resin with and without reinforcing fibers and to evaluate the reinforcing effect of various fibers.
A polyethylene fiber (Ribbond), a polyaramid fiber (Fibreflex), and three glass fibers (FibreKor, GlasSpan, Vectris) were used to reinforce composite resins. The flexural strength and elastic modulus of specimens in the three-point bending mode were measured using a universal testing machine at a cross-head speed of 1 mm/min after storage in water at 37 degrees C for 24 hours. All tests were carried out in a water bath at 37 degrees C. The data were analyzed using analysis of variance and the Sheffé test at P= 0.05. After testing, the fractured surface was evaluated using a scanning electron microscope at 50x, 500x, and 3,000x magnifications.
Yield flexural strengths of nonreinforced resins were 48 to 56 MPa, and those of reinforced resins were 56 to 134 MPa. Ultimate flexural strengths of nonreinforced specimens were 96 to 119 MPa, and those of reinforced ones were 203 to 386 MPa. Elastic modulus of nonreinforced resin was 6 to 9 GPa, and fiber reinforcing increased the value to 9 to 15 GPa, while it had no effect in Ribbond.
Most of the fibers used in this study increased both yield and ultimate flexural strengths of composite resins, with the exception of the yield strength of Vectris. GlasSpan, Fibreflex, and FibreKor were effective in reinforcing elastic modulus, while Ribbond had no effect on it. Unidirectional glass fibers and polyaramid fiber were effective in reinforcing both flexural strength and elastic modulus of composite resin.
本研究旨在测量含增强纤维和不含增强纤维的复合树脂的抗弯强度和弹性模量，并评估各种纤维的增强效果。
使用聚乙烯纤维（Ribbond）、聚芳酰胺纤维（Fibreflex）和三种玻璃纤维（FibreKor、GlasSpan、Vectris）增强复合树脂。将试件在37℃水中储存24小时后，使用万能试验机以1mm/min的十字头速度测量三点弯曲模式下试件的抗弯强度和弹性模量。所有试验均在37℃的水浴中进行。使用方差分析和P = 0.05时的谢费检验对数据进行分析。试验后，使用扫描电子显微镜在50倍、500倍和3000倍放大倍数下评估断裂表面。
未增强树脂的屈服抗弯强度为48至56MPa，增强树脂的屈服抗弯强度为56至134MPa。未增强试件的极限抗弯强度为96至119MPa，增强试件的极限抗弯强度为203至386MPa。未增强树脂的弹性模量为6至9GPa，纤维增强使该值提高到9至15GPa，但对Ribbond无效。
本研究中使用的大多数纤维均提高了复合树脂的屈服和极限抗弯强度，但Vectris的屈服强度除外。GlasSpan、Fibreflex和FibreKor在增强弹性模量方面有效，而Ribbond对其无效。单向玻璃纤维和聚芳酰胺纤维在增强复合树脂的抗弯强度和弹性模量方面均有效。
