根管拡大用Kファイルの切削効率に対する加熱温度の影響
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概要
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Sterilization by heating is being recommended for the K-file for root canal therapy in order to carry out a sure and complete sterilization. However, there is a report where a practitioner who does sterilization by heat for the reason that the cutting part dulls by heating is merely about 20% on a reamer file which is a cutter at the practitioner level. An experiment was carried out for the purpose of investigating the impact of heat on the cutting efficiency of the blade part and mechanical properties by heating the K-file made of austenitic stainless steel with an electric furnace in this study. Four types of K-files were used, which included #25 and #40 with a square cross-section, as well as #45 and #60 with a equilateral triangle cross-section, and an unheated file that did not undergo heating that was chosen as a control group. Each file was heated at a temperature between 100 to 700℃ respectively. Bending and twist rupture tests pursuant to the ISO Standard were then carried out afterwards. Also an evaluation test for cutting efficiency, hardness measurement and SEM observation was carried out. The testing of all four types of K-file revealed that the angle leading up to a twist rupture reached the minimum level at 550℃, and started to increase again at 600℃ and above. The twist maximum moment to the twist rupture and maximum moment at 45 degrees bend showed a similar tendency. To be more specific, the decreased levels were confirmed from 400℃ and above. No degradation in sharpness was apparent up to 600℃ during the evaluation test for cutting efficiency. From the above study, we concluded that there was little impact on the mechanical property and cutting efficiency with a heating temperature up to 400℃ in either tests with the K-file made of austenitic stainless steel.
- 福岡歯科大学学会の論文
- 2002-12-31