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Removal of broken tiles using pulsed Nd:YAG laser irradiaton

Research Project

Project/Area Number 14571810
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeSingle-year Grants
Section一般
Research Field Conservative dentistry
Research InstitutionTokyo Medical and Dental University

Principal Investigator

TAKEDA Atsushi  Tokyo Medical and Dental University, Lecturer, 大学院・医歯学総合研究科, 講師 (50227021)

Co-Investigator(Kenkyū-buntansha) EBIHARA Arata  Tokyo Medical and Dental University, Research Associate, 大学院・医歯学総合研究科, 助手 (60251534)
Project Period (FY) 2002 – 2003
Project Status Completed (Fiscal Year 2003)
Budget Amount *help
¥3,400,000 (Direct Cost: ¥3,400,000)
Fiscal Year 2003: ¥1,300,000 (Direct Cost: ¥1,300,000)
Fiscal Year 2002: ¥2,100,000 (Direct Cost: ¥2,100,000)
KeywordsIntracanal broken instrument / Laser welding / Nd:YAG laser / 歯内療法
Research Abstract

This study investigated a new method for the removal of intracanal broken instruments using laser welding. Twenty-four tips of K files, 10 mm in length (diameter: 0.35 mm), were used in the first experiment. After a hollow stainless-steel tube was inserted into the tip, an optical fiber (q5 =40011 m) was introduced into the tube to touch the tip, and a Nd:YAG laser was irradiated (output energy: 300 mJ, 400 mJ, 500 mJ, 600 mJ; 10 pps; 1 sec). Then, a tensile test was performed. In the second experiment, 30 tips of K files (diameter: 0.25 mm, 0.30 mm, 0.35 mm, 0.40 mm and 0.45 mm) were used. After setting as in the first experiment, the Nd:YAG laser was irradiated at 400 mJ, 10 pps for 1 sec, and the tensile test was performed. Data were analyzed by one-way ANOVA and the Tukey-Kramer test (p<0.05). The results were as follows:
1. In the first experiment, laser welding was successful in all samples. The maximum load of the tensile test in the 300 mi, 400 mJ, 500mj and 600mJ groups was 2.10±1.29 kgf, 5.86±1.42 kgf, 5.29±1.18 kgf and 5.17±1.17 kgf, respectively. The value of the 300 mi group was statistically lower than that of any other group.
2. In the second experiment, laser welding was successful in all samples except three samples in the 0.25 mm group. The maximum load in the 0.25 mm, 0.30 mm, 0.35 mm, 0.40 mm and 0.45 mm groups was 0.91 ± 0.61 kgf, 2.73±0.91 kgf, 5.86±1.42 kgf, 6.40±0.86 kgf and 6.52±1.06 kgf, respectively. The values of the 0.25 mm and 0.30 mm groups were statistically lower than those of the other groups.

Report

(3 results)
  • 2003 Annual Research Report   Final Research Report Summary
  • 2002 Annual Research Report
  • Research Products

    (2 results)

All Other

All Publications (2 results)

  • [Publications] 竹田淳志, 安生智郎, 海老原新, 須田英明: "Nd : YAGレーザーによる根管内破折器具除去に関する基礎的研究"日本レーザー歯学会誌. 15. 14-19 (2004)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2003 Final Research Report Summary
  • [Publications] Atsushi TAKEDA, Tomoo ANJO, Arata EBIHARA, Hideaki SUDA: "Removal of broken tiles using pulsed Nd:YAG laser irradiation -A preliminary study-"J Jpn Soc Laser Dent. 15-1. 14-19 (2004)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2003 Final Research Report Summary

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Published: 2002-04-01   Modified: 2016-04-21  

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