氧化锌晶须填料对义齿基托树脂力学性能的影响

目的：研究添加氧化锌晶须对基托树脂力学性能的影响。方法：将氧化锌晶须按不同的质量百分比加人基托粉中，分为空白对照组、1％、3％、5％、7％等5组。根据ISO标准测试各组的力学性能，并对试样断面进行扫描电镜观察。结果：随着氧化锌晶须用量的增加，复合材料的弯曲强度、弯曲弹性模量、显微维氏硬度呈先升后降的趋势。当氧化锌晶须用量为5％时，以上指标测得值最高，分别为（109．00±2．70）MPa、（3645．30±198．68）MPa、（20．57±0．85）kg／mm^2，树脂基托较对照组弯曲强度提高18．29％、弯曲弹性模量提高16．07％、显微维氏硬度提高29．94％。结论：氧化锌晶须填料显著增强了基托树脂的力学性能。

Effect of zinc oxide whiskers on mechanical properties of denture base

Objective： This study intended to investigate the mechanical properties of polymethyl methyacrylate denture base into which zinc oxide whiskers was added. Methods：We conducted the study on five groups divided according to zinc oxide whiskers con- tent which was added to the denture base including control at the rate of 1% , 3% , 5% and 7%. ISO standard was applied in mechan- ical tests, and the fractured surfaces of specimens were examined under SEM. Results ：Flexural strength, flexural modulus and micro- hardness of composite material increased with the increasing content of zinc oxide whiskers in a limited range. The results showed that the flexural strength, flexural modulus and hardness of composite material rising up to （109. 00 ± 2.70） MPa, （3645.30 ± 198.68 ） MPa, （20. 57 ± 0.85 ） kg/mm2 , when the amount of zinc oxide whiskers in the base made up 5% of the total. And the flexural strength of the composites was enhanced by 18.29% , flexural modulus by 16.07% ,and hardness by 29.9% compared with that of the control group. Conclusions：Zinc oxide whiskers filler significantly enhanced mechanical properties of denture base.