Smear layer
Smear Layer
The Smear Layer (pronunciation: /smɪər leɪər/) is a thin layer of debris produced on the surface of the tooth during dental procedures. It is composed of organic and inorganic materials, including dentin, pulp tissue, and bacteria.
Etymology
The term "smear layer" is derived from the English words "smear", meaning to spread or daub, and "layer", referring to a sheet, quantity, or thickness of material typically one of several, covering a surface or body.
Formation
The smear layer is formed during the process of tooth preparation, specifically during the use of rotary instruments. It is a byproduct of the mechanical action of these instruments on the tooth surface. The layer is typically 1-2 micrometers thick and can penetrate up to 40 micrometers into the dentin tubules.
Removal
The removal of the smear layer is a critical step in many dental procedures, such as root canal treatment. This is because the smear layer can harbor bacteria and impede the penetration of disinfecting agents into the dentin tubules. Various techniques and solutions, such as EDTA (ethylenediaminetetraacetic acid) and sodium hypochlorite, are used to remove the smear layer.
Related Terms
- Dentin: The main, calcified part of a tooth, beneath the enamel and surrounding the pulp chamber and root canals.
- Dentin tubules: Microscopic canals found in the dentin of a tooth.
- Tooth preparation: The process of removing diseased or injured parts of a tooth before restoration.
- Root canal treatment: A dental procedure to treat infection at the center of a tooth (the root canal system).
- EDTA: A chelating agent used in dentistry to remove the smear layer.
- Sodium hypochlorite: A chemical compound used as a disinfectant and bleach, including in dentistry for root canal treatment.
External links
- Medical encyclopedia article on Smear layer
- Wikipedia's article - Smear layer
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