硅烷偶联剂的用量对钛酸钾晶须增强复合树脂的抗弯强度的影响

Potassium titanate whisker modified by silane coupling agent to enhance the bending strength of dental composite resin

目的:研究硅烷偶联剂用量对钛酸钾晶须增强复合树脂抗弯强度的影响。方法:分别采用0.5%、1%、2%、3%、4%(质量比)的硅烷偶联剂KH-570对钛酸钾晶须进行表面处理,再以60%(质量比)的填充量把处理过的5组晶须混合到树脂基质中,并制成标准试件,进行三点弯曲测试及断面的电镜扫描。结果:5组试件的抗弯强度分别是(98.55±12.01)Mpa、(100.60±17.39)MPa、(107.80±5.25)MPa、(134.18±12.90)MPa、(102.15±10.36)MPa,对其进行均数间的两两比较(Tukey检验)可知,3%硅烷偶联剂处理组的抗弯强度在α=0.01的水平上与其它组结果具有显著性差异,其余4组间差异无统计学意义。3.0%硅烷偶联剂处理组断裂面的扫描电镜照片显示晶须与树脂间的结合良好。结论:硅烷偶联剂KH-570能够增强钛酸钾晶须和树脂间的界面结合强度,但其太多太少均会造成界面结合强度都会下降,本试验KH-570的用量3%时,增强效果最好。

Objective： To study the enhance effect of the bending strength of dental composite resin with potassium titanate whisker modified by silane coupling agent. Methods： The potassium titanate whisker there surface treated by KH-570 at 0.5%, 1%, 2%, 3%, 4% mass fraction respectively, then the five groups of surface-treated whiskers were mixed into the resin matrix at a filler mass fraction of 60% manually. Specimens of the five groups of composite resins were fabricated with standard sizes, and three-point bending strength was tested, then the fracture surface was observed by electron microscopy. Results： The bending strength of the five groups were （98.55±12.01）MPa, （100.60± 17.39）MPa, （107.80±5.25）MPa, （134.18± 12.90）MPa, （102.15 ± 10.36）MPa respectively. Tukey＇ s multiple comparison was performed, and the results indicated that the difference of the bending strength between 0.5%, 1%, 2% and 4% silane groups was not significant. The bending strength of the 3% was significantly higher than that of the other four groups at the α=0.01 level. The SEM pictures of the group treated by 3.0% silane coupling agent showed the well bonded interface between whisker and resin matrix. Conclusions： Silane coupling agent, KH-570, could improve the whisker combined with the resin matrix. However, two much or too little will cause the interface strength declined. For this experiment, the 3% silane coupling egent the reinforcement was the best.