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KMID : 0362120190410030167
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Journal of Technologic Dentistry
2019 Volume.41 No. 3 p.167 ~ p.175
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Comparison of Mechanical Properties of Zirconia Copping by multi-layered zirconia blocks and Design locations
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Kang Jae-Min
Kim Won-young
Chung In-Sung
Jeon Byung-Wook j
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Abstract
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Purpose: This study was investigated the effect of multi-layer zirconia block type and design location on the mechanical properties of zirconia copings.
Methods: Three kinds of multi-layered zirconia blocks (Snow princess multi layered block, Multi cherry, Dental zirconia pre-shaded blank) were used to identify the effects of the kinds of multi-layered zirconia blocks, design locations on mechanical characteristics of zirconia copings. 150 Zirconia copings were fabricated and fracture strength, hardness and microstructure were compared and evaluated.
Results: Dental zirconia pre-shaded blank(2,256.9N) had the highest fracture strength of zirconia copings on all the design locations, and it was followed by Snow princess multi layered block(2,107.5N) and Multi cherry(917.0N). Snow princess multi layered block(1,949.7Hv) had the highest hardness of zirconia copings on all the design locations, and it was followed by Dental zirconia pre-shaded blank(1,671.7Hv) and Multi cherry(1,383.7Hv). The cervical layer had the highest fracture strength and hardness of zirconia copings in all the blocks, and it was followed by the cervical+gradation layer, the enamel layer, the enamel+gradation layer, and the gradation layer.
Conclusion: It was found that the fracture strength and hardness were different according to the kinds of multilayer zirconia block and design location, and it was confirmed that it is lower than the fracture strength of white zirconia.
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KEYWORD
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Multi-layered zirconia block, Location of design, Fracture strength
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