4种牙科玻璃纤维桩挠曲强度与弹性模量的对比分析

Study on flexural strength and elastic modulus of 4 kinds of glass fiber posts

目的对比分析临床常用的4种玻璃纤维桩的挠曲强度及弹性模量。方法选取Style Post(A组)、Parapost Fiber Whiter(B组)、Fiber Kor(C组)、Twin-Luscent Anchor(D组)纤维桩各10支,采用三点抗弯强度试验测定其挠曲强度和弹性模量,并进行统计分析。结果 A组挠曲强度显著高于其余3组(P<0.05),B组与C组挠曲强度最小,组间无统计学差异(P>0.05)。A组与D组的弹性模量无显著性差异(P>0.05),均低于其他2组(P<0.05)。纵向扫描电镜图显示,B组和C组试样出现较多裂纹,整体呈现较大程度的劈裂模式。结论 4种玻璃纤维桩挠曲强度及弹性模量间存在较大差异,A组挠曲强度最大,A组和D组弹性模量与牙本质最为接近,挠曲强度值与纤维/基质比间存在线性关系。

Objective To compare and analyse the flexure strength and elastic modulus of 4 kinds of dental fiber posts frequently used in clinics. Methods The flexural strength and elastic modulus of Style Post （ group A） , Parapost Fiber Whiter（ group B ） , Fiber Kor（group C） and Twin-Luscent Anchor（group D） fiber posts were measured through three-point bending test with 10 firber posts in each group. The resuhs were statistically analyzed. Results The flexure strength of group A was the highest,while that of group B and group C was the lowest, and there were no statistical differences among the groups（ P 〉 0.05 ）. There were no significant differences be- tween group A and group D in elastic modulus （P 〉 0.05 ） , and the elastic modulus of group A and group D were both lower than that of the other two groups（ P 〈 0.05 ）. Multitudinous cracks were observed in group B and C from SEM photos and there was a great degree of rupture generally. Conclusions The flexure strength and elastic modulus of 4 kinds of glass fiber posts are significantly different. The flexural strength and fiber/matrix ratios are linearly dependent.