Article

Removal of two types of root canal filling material using pulsed Nd:YAG laser irradiation.

Pulp Biology and Endodontics, Department of Restorative Sciences, Graduate School, Tokyo Medical and Dental University, Tokyo, Japan.
Photomedicine and Laser Surgery (impact factor: 1.25). 01/2005; 22(6):470-6. DOI:10.1089/pho.2004.22.470 pp.470-6
Source: PubMed

ABSTRACT The aim of this study was to examine the usefulness of a pulsed Nd:YAG laser in removing two types of endodontic obturation material from the root canal in vitro.
Recently, a fine flexible glass fiber made of quartz has been developed to transmit the laser beam more effectively and permit its concentration in a specific area. This has increased the potential usefulness of the Nd:YAG laser in root canal treatment. Methods: The time required for removing the root canal obturation material (Gutta-percha cones and, Sealapex or AH26) by means of either Nd:YAG laser irradiation or a conventional method (Gates Glidden drills and K files) was measured. Contact microradiography was used to assess the radiopacity of the root canals before and after the removal of obturation material. The surfaces of the root canal after removal of the obturation materials were also observed by scanning electron microscopy.
Although none of the methods used in this study resulted in complete removal of debris from the root canal wall, the time required for the removal of any of the root canal obturation materials using laser ablation was significantly shorter than that required using the conventional method (p < 0.05). It appeared that some orifices of the dentinal tubules were blocked with melted dentin following laser irradiation.
Nd:YAG laser irradiation is an effective tool for the removal of root canal obturation materials, and may offer advantages over the conventional method.

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Keywords

canal obturation materials
 
complete removal
 
Contact microradiography
 
conventional method
 
dentinal tubules
 
fine flexible glass fiber
 
Gates Glidden drills
 
laser ablation
 
laser beam
 
laser irradiation
 
melted dentin
 
obturation materials
 
potential usefulness
 
root canal
 
root canal obturation material
 
root canal obturation materials
 
root canal wall
 
root canals
 
scanning electron microscopy
 
specific area
 

Tomoo Anjo