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KMID : 1004520220380030138
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Journal of Dental Rehabilitation and Applied Science
2022 Volume.38 No. 3 p.138 ~ p.149
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Literature review on fractography of dental ceramics
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Song Min-Gyu
Cha Min-Sang
Ko Kyung-Ho
Huh Yoon-Hyuk
Park Chan-Jin
Cho Lee-Ra
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Abstract
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The clinical applicability of ceramics can be increased by analyzing the causes of fractures after fracture testing of dental ceramics.
Fractography to analyze the cause of fracture of dental ceramics is being widely applied with the development of imagingtechnologies such as scanning electron microscopy. Setting the experimental conditions is important for accurate interpretation.
The fractured specimens should be stored and cleaned to avoid contamination, and metal pretreatment is required for betterobservation. Depending on the type of fracture, there are dimple rupture, cleavage, and decohesive rupture mainly observedin metals, and fatigue fractures and conchoidal fractures observed in ceramics. In order to reproduce fatigue fracture in thelaboratory, which is the main cause of fracture of ceramics, a dynamic loading for observing slow crack growth is essential, and theload conditions and number of loads must be appropriately set. A typical characteristic of a fracture surface of ceramic is a hackle,and the causes of fracture vary depending on the shape of hackle. Fractography is a useful method for in-depth understanding offractures of dental ceramics, so it is necessary to follow the exact experimental procedure and interpret the results with caution.
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KEYWORD
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crack growth, dental ceramic, fractography, fatigue fracture, hackle
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