Endodontics and the Smear Layer: History, Effects and Approaches for Removal

The smear layer is the accumulation of mineralized and organic matter during endodontic therapy. The history of smear layer, its effect and approaches for removal are described in this review. The approaches for removal of smear layer include chemical removal, ultrasonic removal, laser removal and a combination of these approaches. In spite of diversity of opinions as to removal of the smear layer the general consensus stands in favor of removal of smear layer and the authors concur with the opinion that smear layer must be removed for better results in endodontic.