目的:探讨四针状氧化锌晶须基托复合树脂与传统基托树脂冲击强度及洛氏硬度.方法:称取不同质量的四针状氧化锌晶须和热凝牙托粉,制成四针状氧化锌晶须比例为0%、3%、5%和10%的复合树脂,采用自制模具,将材料分别填塞到模具中,二次加压,热处理后,检测挠曲强度(Flexual Strength,FS)、抗压强度(Compression Strength,CS)和径向拉伸强度(Diametral Tensile Strength,DTS)、洛氏硬度(Rockwell Hardness,HR)和冲击强度(Impact Strength,IS).结果:随着四针状氧化锌晶须添加量的增加,树脂的机械强度、HR和IS呈先升高后降低的趋势,当四针状氧化锌晶须添加量为5%时,其FS、CS、DTS、HR和IS值达到最优,与无添加的基托树脂相比,FS、CS、DTS、HR和IS值分别增加了45.6%、13.6%、40.0%、20.9%和66.7%,并具有统计学差异(P<0.05).结论:四针状氧化锌晶须的添加量对基托复合树脂的FS、CS、DTS、HR和IS值均有影响,当四针状氧化锌晶须添加量为5%时,其FS、CS、DTS、HR和IS值达到最优.%Objective:To investigate the impact strength and rockwell hardness on tetrapod-like zinc oxide denture base resin and traditional denture base resin.Methods:Tetrapod-like zinc oxide and heat curing denture powder in different qualities were weighted to make tetrapod-like zinc oxide with ratio of 0%,3%,5% and 10% in composite resin.The materials were packed into homemade molds with second pressure.After heating treatment,flexural strength(FS),compressive strength (CS) and Diametral Tensile Strength (DTS),rockwell hardness (HR) and impact strength (IS) were tested.Results:With the increase of tetrapod-like zinc oxide content,the mechanical strength of the resin,HR and IS increased and then decreased.When the tetrapod-like zinc oxide whisker content reached 5%,the FS,CS,DTS,HR and IS had optimal values.Compared to traditional denture base resin,FS,CS,DTS,HR and IS values were increased by 45.6%,13.6%,40.0%,20.9% and 66.7% (P<0.05),respectively with a significant difference.Conclusion:The tetrapod-like zinc oxide whisker content can affect the values of traditional denture base resin.When the tetrapod-like zinc oxide whisker contents reach 5%,the FS,CS,DTS,HR and IS values are optimal.
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