Abstract:

To evaluate the effect of the combination of selfetching adhesive XenoⅢ and laser on dentin permeability of extracted teeth.  MethodsForty extracted teeth whose occlusal surfaces were treated were divided randomly into four groups. Group A was varnished by selfetching adhesive XenoⅢ, group B was irradiated by laser, and group C was treated by the combination of the selfetching adhesive XenoⅢ and laser. Group D was untreated. The extracted teeth were immersed in the methylene blue solution. The dye penetration depth was measured under a dental microscope. Statistical analysis of four groups′ measurement results was carried out. ResultsThe dye penetration depth in group C  was less than that in group A or B（P＜0.05）, and obviously smaller than that in group D（P＜0.01）. ConclusionThe combined application of selfetching adhesive XenoⅢ and semiconductor laser can reduce the permeability of extracted teeth dentin more efficiently than selfetching adhesive or semiconductor laser applied alone.

Key words: Dentinbonding agents； Laser； Dentin tubule permeability； Dentin hypersensitivity