Removal of the Smear Layer Using Er: YAG Laser with a Cone-shaped Tip

• YOSHIMINE Yoshito

  Department of Endodontology and Operative Dentistry, Division of Oral Rehabilitation, Faculty of Dental Science, Kyushu University

• MATSUMOTO Himeka

  Department of Endodontology and Operative Dentistry, Division of Oral Rehabilitation, Faculty of Dental Science, Kyushu University

• NISHIGAKI Soichiro

  Department of Endodontology and Operative Dentistry, Division of Oral Rehabilitation, Faculty of Dental Science, Kyushu University

• ONO Makiko

  Department of Endodontology and Operative Dentistry, Division of Oral Rehabilitation, Faculty of Dental Science, Kyushu University

• GOTO Chisato

  Department of Endodontology and Operative Dentistry, Division of Oral Rehabilitation, Faculty of Dental Science, Kyushu University

• ISOBE Ryoko

  Department of Endodontology and Operative Dentistry, Division of Oral Rehabilitation, Faculty of Dental Science, Kyushu University

• AKAMINE Akifumi

  Department of Endodontology and Operative Dentistry, Division of Oral Rehabilitation, Faculty of Dental Science, Kyushu University

Bibliographic Information

Other Title

• 円錐型チップを装着したEr:YAGレーザーの根管内スミヤー層除去効果

Abstract

The aim of the study was to assess the effects of Er: YAG laser irradiation equipped with a cone-shaped tip (300μm inner-diameter) on root canal walls of extracted human teeth and on bovine dentin slices. Human teeth mechanically prepared using K-files were irradiated by Er: YAG laser at the output powers of 30 mJ and 40 mJ without air and water cooling. Subsequently, the samples were split longitudinally and observed under a scanning electron microscope (SEM). SEM showed the crater formation with the removal of smear layer and open dentinal tubules, free of melting, crack, and carbonization. The size of open tubules by laser was smaller than that by chemical irrigation using EDTA. In addition, Er: YAG laser was applied to bovine dentin surfaces with a thickness gauge (50, 100, or 150μm) between the tip and dentin slices. Laser microscopic analysis revealed that the ablation effect of Er: YAG laser largely decreased by distance between the tip and dentin wall. These results indicate that the Er: YAG laser in conjunction with a cone-shaped tip is a suitable tool for removing the smear layer in root canals. Moreover, it was suggested that in the apical third of the root canal the use of a tip which fits the size of enlarged canals is necessary for the efficient cleaning of the mechanically prepared canal wall.

Journal

• The Japanese Journal of Conservative Dentistry

  The Japanese Journal of Conservative Dentistry 51 (2), 156-162, 2008

  The Japanese Society of Conservative Dentistry

Keywords

• Er: YAG laser
• Smear layer
• Intracanal irradiation

Details

• CRID: 1390001205520697088
• NII Article ID: 110007151229
• NII Book ID: AN00191201
• DOI: 10.11471/shikahozon.51.156
• ISSN: 21880808
• ISSN: 03872343
• Web Site: https://search.jamas.or.jp/link/ui/2008211026
• Text Lang: ja
• Data Source:
  • JaLC
  • CiNii Articles
  • KAKEN
• Abstract License Flag: Disallowed