Dentin blocks were prepared from 36 freshly extracted teeth and randomly divided into 3 groups(n=1 2).The block surfaces were cleaned and then treated with 3 MP90 bonding system,Gluma desensitizer and distilled water respectively.Scanning electron microsco-py observation showed that the dentin tubule sealing rate of 3 MP90 bonding system,Gluma desensitizer and distilled water was 1 00%, 76.48% and 0(P<0.05)respectively.
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