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KMID : 0362420100480020143
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Journal of Korean Academy of Prosthodontics
2010 Volume.48 No. 2 p.143 ~ p.150
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Adaptability of zirconia core fabricated by cold isostatic pressing
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Seo Yoon-Jeong
Yun Kwi-Dug
Park Sang-Won
Kim Hyun-Seung
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Abstract
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Purpose: The purpose of this study is to fabricate the new zirconia block (CNU block) and to evaluate fit of core and porcelain veneered zirconia crown.
Material and methods: The experimental blocks were fabricated from the commercial ytrria-stabilized zirconia powder (KZ-3YE Type A). The powder was uniaxial pressing and the green bodies were conducted using the Cold Isostatic Pressing. The zirconia blocks were presintered at 1040℃ and the final sintering was performed at 1450℃. The Kavo Everest ZS blank® (KaVo, Biberach/Riβ.) was used as a control group. The linear shrinkage of CNU block and Kavo block were compared. Twenty-one cores for porcelain veneered crowns were fabricated with CAD/CAM system (Everest®, Biberach/Riβ.). Group I: seven cores fabricated from Kavo blocks, Group II: seven cores fabricated from CNU blocks, Group III: seven cores from CNU blocks and porcelain veneering for crowns. All specimens were cemented and sectioned into two planes: diagonal and bucco-lingual. The measurement of the marginal, internal, and occlusal fit was carried out using SEM (S-4800®) at 30 ×. The results were analyzed by one-way ANOVA test.
Results: The linear shrinkage of the CNU block and the KaVo block was 19.00% and 20.09%. The marginal gap of cores (29.67 ± 6.58 μm) fabricated from CNU blocks showed significantly smaller than that of the cores of Kavo blocks (36.84 ± 7.18 μm) (P < .05). The internal gaps of the porcelain veneered crowns (32.23 ± 6.33 μm) were larger than those of the other two groups (37.57 ± 6.81 μm and 38.14 ± 6.81 μm).
Conclusion: No statistically significant difference was found in between experimental groups and control group. The experimental groups in marginal gap showed significantly smaller than the control group.
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KEYWORD
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Core, Cold isostatic pressing, Marginal fit, Shrinkage, Zirconia
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