Layer,Smear
《英文msh詞典》Layer,Smear
[入口詞] Layer,Smear
[主題詞] Smear Layer
[英文釋義] Adherent debris produced when cutting the enamel or dentin in cavity preparation. It is about 1 micron thick and its composition reflects the underlying dentin,although different quantities and qualities of smear layer can be produced by the various instrumentation techniques. Its function is presumed to be protective,as it lowers dentin permeability. However,it masks the underlying dentin and interferes with attempts to bond dental material to the dentin.