What is smear layer Endodontics?
When the root canals are instrumented during endodontic therapy, a layer of material composed of dentine, remnants of pulp tissue and odontoblastic processes, and sometimes bacteria, is always formed on the canal walls. This layer has been called the smear layer.
What is importance of smear layer?
The smear layer is a physical barrier that decreases the penetration of disinfecting agents into dentinal tubules, and consequently, their efficacy. The most important cause of endodontic failure is the residual microorganisms that are harboured within the root canal system and hard-to-reach areas.
Is the smear layer organic or inorganic?
The smear layer consists of both; organic and inorganic components. The organic component is usually a collection of pulpal and bacterial debris whereas the inorganic component is mainly made of dentinal debris.
What removes the smear layer?
The solution most frequently used to remove the smear layer is ethylenediaminetetraacetic acid (EDTA) [12].
How does EDTA remove smear layer?
The smear layer removal action of EDTA can be attributed to its chelation action on the root canal. The moderate smear removal observed in the apical third may be due to incomplete penetration of EDTA in the apical area of the root canal.
What is EDTA used for in dentistry?
EDTA works by reacting with the mineral components of the hard tissues of the tooth. The chelating agent EDTA softens the tissues, decalcifying the canal walls. It facilitates the mechanical preparation of the root canal and further removal of the smear layer, which opens dentin tubules.
What is EDTA in RCT?
A liquid solution of ethylenediaminetetraacetic acid (EDTA) was thought to chemically soften the root canal dentine and dissolve the smear layer, as well as to increase dentine permeability.
What is in RC Prep?
RC-Prep™’s unique formulation of glycol, urea peroxide and EDTA in a special water-soluble base has made it the clinician’s choice for helping remove calcifications while whitening, deodorising and lubricating the canal to permit more efficient instrumentation.