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
胶比较，
差异有显著意义（P<0.05），硅胶
PMMA。
胶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与硅胶比较，差异有显著意义（P<0.05），硅胶PMMA。
PMMA
与硅胶比较，
差异有显著意义（P<0.05），硅胶
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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