The flexure modulus test results shows, the flexure modulus of the middle layer group PMMA strengthening material has no obvious difference with the same thickness group (P>0.05);

弹性模量测试结果表明，中间层组的PMMA加强材料的弹性模量与相同厚度的对照组无显著差异（P＞0.05）；

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