Abstract
The bond strength of resin to dentin and the stability are influenced by diffusion rate of monomers into dentin, and their polymerization in situ.The diffusion rate of monomers is changed with the permeability of dentin and diffusibility of monomers.Dimethyl sulfoxide can improve the permeability of skin.Polymerizable dialkyl sulfoxide, 2-methacryloyloxyethyl methyl sulfoxide(MEMSO)was effective in improving the permeability of demineralized dentin whose collagen had been shrunk during the removal of the smear layer by pre-treatment with 10% citric acid and air blow.Then monomers could diffuse into dentin.The scanning electron microscopic examination demonstrated the formation of a"hybrid"layer by addition of MEMSO treatment.This"hybrid"layer was essential for higher tensile bond strength to be attained.
