The Effect Of Desensitizer On The Bonding Interface Morphology And The Shear Bond Strength Of Two Resin Cements

Objective:The experiment study on bonding interface microstructure morphology and adhesion strength of Adper easy one self-etching adhesive and Prime&Bond NT total-etching adhesive,after using Gluma desensitizer and Bifluorid12desensitizer, to provide theoretical basis for the choice of desensitization and resin cements。Methods:84freshly extracted young human premolars due to orthodontic reasons were collected and stored in refrigerator containing-20℃。 All84teeth by the same operator under running water washing grinding tooth surface enamel。 The samples according to different desensitizers were randomly divided into group A(control group), group B (Gluma group) and group C (Bifluorid12group)3groups, with28samples in each group。 The control group did not use desensitizer, the other two groups respectively using the corresponding desensitizer。 Each group according to different binder was randomly divided into2groups, groupA1, group B1, group C1were using Prime&Bond NT total-etching adhesive, group A2, group B2, group C2were using Adper easy one self-etching adhesive。4samples were randomly selected of each group,2samples were used to observe the characteristics of the dentin surface,2samples were used to observe the characteristics of the profile feature。The other60samples were using hierarchical curing technology, the prepared resin adhesive joint, after standing for half an hour at room temperature in37℃water bath for24hours。 Testing the vertical speed to load0.5mm/min, record the test results, statistical analysis was performed by SPSS17.0software。Results:1.Scanning electron microscope observation:there were no obvious change on the interface morphology of two species of binder after coating Gluma desensitizer。There was a large number of irregular crystal structure on the interface morphology of Adper easy one self-etching adhesive after coating Bifluorid12desensitizer, the granular sediment dentin tubule, the interface morphology of Prime&Bond NT total-etching adhesive was rough。2.Prime&Bond NT total-etching adhesive and Adper easy one self-etching adhesive shear strength compared with the control group had increasing trend,but the difference was not statistically significant (P>0.05); The samples that were coated Bifluorid12desensitizer have no statistically significant effect of Prime&Bond NT total etching adhesive (P>0.05),the samples that were coated Bifluorid12desensitizer can decrease the shear strength of adper easy one self-etching adhesive,the effect of adper easy one self-etching adhesive was statistically significant(P<0.05)。 Conclusion:Adper easy one self-etching adhesive and Prime&Bond NT total-etching adhesive can be used in conjunction with the Gluma desensitizer in clinical work,Prime&Bond NT total-etching adhesive and Bifluorid12with good using effect。...