Fracture Toughness Measurement of Dental Ceramics Using the Indentation Fracture Method with Different Formulas
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概要
- 論文の詳細を見る
This study examined fracture toughness (K_<IC>) measurements obtained using the indentation fracture (IF) method with a view to improving their reliability. The K_<IC> values of five dental ceramics were measured using the IF method with five different formulas, and the single-edge precracked beam (SEPB) method was used as a control. The elastic moduli of the dental ceramics were evaluated by dynamic hardness test. Load conditions of the dental ceramics that produced a median/radial crack for the IF method formulas were investigated. Based on the resultant c/a and P/c^<1.5> values, the indentation load (P) required for median/radial crack occurrence varied greatly from 29.4 to 196 N depending on the ceramic used. Among the five formulas, none of the K_<IC> values obtained by the IF method with Miyoshi's formula differed significantly (p>0.05) from the values obtained using SEPB method. These results suggested that, after an appropriate indentation load is determined, reliable K_<IC> values for small dental ceramic specimens can be easily obtained using the IF method if Miyoshi's formula is used in combination with the dynamic hardness test.
- 日本歯科理工学会の論文
著者
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FUJISHIMA Akihiro
Department of Oral Biomaterials and Technology, School of Dentistry, Showa University
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HOTTA Yasuhiro
Department of Oral Biomaterials and Technology, School of Dentistry, Showa University
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MIYAZAKI Takashi
Department of Oral Biomaterials and Technology, School of Dentistry, Showa University
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Miyazaki Takashi
Department Of Oral Biomaterials & Technology Showa University School Of Dentistry
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Miyazaki Takashi
Department Of Oral Biomaterials And Technology Showa University School Of Dentistry
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Fujishima Akihiro
Department Of Oral Biomaterials And Technology School Of Dentistry Showa University
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Hotta Yasuhiro
Department Of Oral Biomaterials & Technology Showa University School Of Dentistry
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MAEHARA Satoshi
Department of Oral Biomaterials and Technology, Showa University School of Dentistry
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Hotta Yasuhiro
昭和大学 歯学部歯科理工学教室
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Miyazaki Takashi
Showa Univ. School Of Dentistry Tokyo Jpn
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Miyazaki Takashi
昭和大学 歯学部
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Fujishima Akihiro
Showa Univ. School Of Dentistry Tokyo Jpn
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Miyazaki Takashi
Department Of Endocrinology And Metabolism Division Of Molecular Adaptation Research Institute Of En
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Maehara Satoshi
Department Of Oral Biomaterials And Technology Showa University School Of Dentistry
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Miyazaki Takashi
Department Of Animal Science Faculty Of Bioresources Mie University
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