钛酸钾晶须增强的复合树脂与两种常用复合树脂的抗弯强度的比较

目的：比较钛酸钾晶须增强的复合树脂与两种常用复合树脂的抗弯强度。方法：以3%硅烷偶联剂处理的钛酸钾晶须按照60%填充量与树脂基质混合,合成热固型和化学固化型两种复合树脂。参照ISO-10477标准,将这两种复合树脂以及临床上常用的两种复合树脂Artglass、Z250制成标准试件,进行三点弯曲测试,并结合显微镜形貌观察,对钛酸钾晶须的增强效果进行比较研究。结果：Z250、化学固化组、热固化组、Artglass的抗弯强度分别是（112.86±13.47）MPa、（102.06±9.36MPa、（123.90±15.90）MPa、（90.60±13.35）MPa。热固化组的抗弯强度显著高于Artglass组。化学固化组的抗弯强度与Z250的抗弯强度相当,低于热固化组。钛酸钾晶须和树脂基质结合良好,能有效阻止微裂纹的形成和扩展。结论：经钛酸钾晶须增强的热固化型复合树脂,其抗弯强度高于其它两种常用的牙用复合树脂。

Compare the flexural strength of dental composite resins reinforced by potassium titanate whiskers with two commonly used composites

Objective： To compare the flexural strength of dental composite resins reinforced by potassium titanate whiskers with Artglass and Z250. Methods： Heat-curing and chemical-curing composite resins, were synthesized by mixing potassium titanium whiskers modified by 3wt% silane coupling agent with the resin matrix at concentration of 60wt%. It was tested with Artglass and Z250 composites with three-point bending test according to ISO-10477. Results： The flexural strengths of Z250, chemical-curing, heat-curing, and Artglass are （112.86± 13.47）MPa, （102.06± 9.36）MPa, （123.90±15.90）MPa, （90.60± 13.35）MPa respectively. The flexural strength of heat-curing composite resins reinforced by silanized potassium titanium whiskers was significantly higher than Artglass. The chemical-curing group was colsed the Z250, but lower than that of the heat-curing group resins. Good combination was observed between potassium titanate whiskers and resin matrix by scanning-electron microscopy （SEM）, which effectively prevented micro-crack formation and propagation. Conclusion： The heat-curing composite resins reinforced by potassium titanium whiskers have higher flexural strength than Artglass and Z250.