Torabinejad Mahmoud, Handysides Robert, Khademi Abbas Ali, Bakland Leif K
Department of Endodontics, School of Dentistry, Loma Linda University, CA 92350, USA.
Oral Surg Oral Med Oral Pathol Oral Radiol Endod. 2002 Dec;94(6):658-66. doi: 10.1067/moe.2002.128962.
It has been recognized for many years that root canal instrumentation produces a smear layer that covers the surfaces of prepared canal walls. This layer contains inorganic and organic substances such as fragments of odontoblastic processes and necrotic debris. There is a lack of agreement regarding the effect of the smear layer on the quality of instrumentation and obturation, but the smear layer itself may be infected and may protect the bacteria within the dentinal tubules. Various methods have been used to remove the smear layer. Conflicting results have been obtained from numerous in vitro studies regarding the significance of the presence or the removal of the smear layer.
多年来人们已经认识到，根管预备会产生一层覆盖在已预备根管壁表面的玷污层。该层包含无机和有机物质，如成牙本质细胞突起的碎片和坏死碎屑。关于玷污层对根管预备和充填质量的影响，目前尚无定论，但玷污层本身可能已被感染，并且可能保护牙本质小管内的细菌。人们已经使用了各种方法来去除玷污层。众多体外研究对于玷污层存在或去除的意义得出了相互矛盾的结果。
