玻璃纤维预拉伸对增韧光固化树脂基桩力学性能的影响

Influence of pre-tension of glass fibers on mechanical properties of dental FRC resin posts

目的研究玻璃纤维预拉伸对自行研制的高强玻璃纤维增韧光固化树脂复合材料(FRC)桩力学性能的影响。方法利用加载装置将高强玻璃纤维分别拉伸0%、0.5%、1.0%后,按60%体积比浸入自行配置的光固化树脂基质,采用压膜法制成玻璃纤维增韧树脂基齿科桩,三点弯曲测试各试样的弯曲模量、弯曲强度和弯曲载荷,测试结果进行统计学分析。使用扫描电子显微镜观察FRC桩横截面和断裂面的形态。结果玻璃纤维拉伸率对FRC桩的力学性能影响有显著差异,其中拉伸率为1.0%的玻璃纤维制成的FRC桩综合性能最佳,弯曲模量(20.40±1.40)GPa,弯曲强度(573.38±29.45)MPa,弯曲载荷(180.42±5.88)N,与未预拉伸的玻璃纤维增韧的FRC桩有显著差异(P<0.05)。结论玻璃纤维预拉伸对FRC桩有增韧效果。

Objective To study the effect of pre-tension of glass fiber on mechanical properties of newly developed glass fiber reinforced light-cured resin composite（FRC） posts. Methods Glass fibers were stretched 0,0.5% and 0.1% respectively. The glass fibers without pre-tension were used to be the control group. Each kind of glass fibers were mixed into the resin matrix respectively with a 60% ,and then were light-cured within a special transparent mold to prepare the FRC specimens. FRC specimens were subjected to a three-point flexural bending test to establish the flexural module, the flexural strength and fracture loads. Data were analyzed using a one-way analysis of variance and the Tukey HSD post hoc tests （ α = 0 . 05 ）. A field emission scanning electron microscope was used to observe the cross section surface of FRC and the fracture surface of the FRC after three-point flexural bending test. Results Different pre-tension rates of glass fibers imposed different effects on mechanical properties of FRC posts. FRC posts with 1% pre-tension rate presented flexure modulus of （20.40 ± 1.40） GPa, flexure strength of （573.38 ± 29.45） MPa, and flexure load of （180.42 ± 5.88 ） N, which were statistically higher than the FRC posts reinforced with glass fibers subjected to no pre-tension （ P 〈 0.05 ）. Conclusions Glass fiber pre-tension can be used to reinforce FRC.