There were significant different between PMMA group and silicon–gelatum group in high frequency（P<0.05）, silicon–gelatum group was superior to PMMA group.
PMMA
与硅
比较，高
异有显著意义（P<0.05），硅
于PMMA。
There were significant different between PMMA group and silicon–gelatum group in high frequency（P<0.05）, silicon–gelatum group was superior to PMMA group.
PMMA与硅比较，高异有显著意义（P<0.05），硅于PMMA。
PMMA
与硅比较，高
异有显著意义（P<0.05），硅
于PMMA。
There were significant different between PMMA group and silicon–gelatum group in high frequency（P<0.05）, silicon–gelatum group was superior to PMMA group.
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