Effect of UltraEZTM Desensitization on Dentin Bonding Strength and Micro-morphology / 医学研究杂志

ABSTRACT

Objective To observe the effect of UltraEZTM desensitization on dentin bonding strength and microstructure.Methods In vitro studies were performed with 90 third molars,which randomly divided into group A,group B and control group,with 30 particles in each group.Group A was treated with UltraEZTM for desensitization,group B was desensitized with MI paste,and Group C was not desensitized.Than the three groups were divided into two subgroups,each of 15 particles.Two subgroups were coated with full acid etching adhesive and self-etching adhesive.The bonding strength of dentin and enamel after bonding with three self-etching adhesives,the fracture patterns of the three groups were compared.The microstructures of the interface were observed by scanning electron microscopy.Results The dentin bonding strength and enamel adhesion strength by full acid etching adhesive and self-etching adhesive in group A were were higher than those in group B (P ＜ 0.05),and comparable to the control group (P ＞ 0.05).The fracture pattern of the total etching adhesive and self-etching adhesive in the control group were mainly C type (66.67％,73.33％),partly B type (33.33％,26.67％).In Group A,there were mainly C type (46.67％,53.33％),partly A-type and B-type fracture.In B group,there were with B-type fracture (60.00％,73.33％) mainly,part of A-type C-type fracture.The distribution of fracture pattern in the three groups was statistically significant (P ＜ 0.05).Conclusion The application of UltraEZTM desensitizer did not significantly affect dentin bonding strength,and the microscopic morphology was close to that of untreated dentin,which was the first choice for desensitization.