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The smear layer: a phenomenon in root canal therapy
B H Sen1, P R Wesselink, M Türkün
1Department of Endodontics, Ege University, Izmir, Turkey.
International Endodontic Journal
|May 1, 1995
Summary
The endodontic smear layer, a residue from root canal instrumentation, is debated. While it hinders sealer penetration, its removal risks re-infection, necessitating further clinical importance studies.
Area of Science:
- Endodontics
- Dental Materials Science
Background:
- Root canal instrumentation forms a smear layer on canal walls.
- This layer consists of dentine, pulp remnants, and potentially bacteria.
- Its role in endodontic therapy remains controversial.
Purpose of the Study:
- To discuss the advantages and disadvantages of the endodontic smear layer.
- To evaluate the necessity of smear layer removal in endodontic procedures.
- To review effective methods for smear layer removal.
Main Methods:
- Literature review on smear layer formation, properties, and effects.
- Discussion of outcomes related to smear layer presence and removal.
- Analysis of irrigation solutions and techniques for smear layer management.
Main Results:
- The smear layer impedes sealer penetration into dentinal tubules, potentially affecting obturation seal.
- It is not a complete barrier to bacteria and delays disinfectant action.
- EDTA and NaOCl are effective in smear layer removal, with techniques like ultrasonics also considered.
Conclusions:
- The clinical significance of smear layer presence or absence requires further investigation.
- Smear layer removal may increase the risk of dentinal tubule re-infection if the seal fails.
- Balancing smear layer removal benefits against potential risks is crucial for endodontic success.