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.
Dental plaque refers to a combination of organic and inorganic substances that accumulate on teeth due to dental instrumentation. This layer can potentially harbor bacteria and their by-products, contributing to oral health concerns. Dental plaque is formed when bacteria colonize the tooth surface and interact with food particles and saliva. If not adequately removed through regular oral hygiene practices, such as brushing and flossing, plaque can lead to dental issues such as tooth decay and gum disease.