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KMID : 0362420000380060757
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Journal of Korean Academy of Prosthodontics
2000 Volume.38 No. 6 p.757 ~ p.764
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Evaluation of the fracture resistance of all-ceramic zirconia posts by 3 different methods
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Jeong Seung-Mi
Chung Chae-Heon
Kang Dong-Wan
Ludwig Klaus
Kern Matthias
Huels Alfons
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Abstract
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Statement of the problem: All-ceramic post-and-core restorations offer a number of advantages compared with systems that use metal build-ups. In certain clinical cases, however, fractures at the joint between the post and core build-up have been reported.
Purpose: The objective, therefore, is to improve the joint between the post and the core build-up.
Material and methods: Three different methods were used to prepare all-ceramic post-andcore restorations; pressing IPS Empress core build-ups to CosmoPost zirconia posts, cementing IPS Empress core build-ups to CosmoPost zirconia posts and Celay-milling of zirconia blanks.
A series of ten restorations was prepared for each of the three methods. The post-and-core complexes were tested to failure with the load applied perpendicular to the post axis. The load and deflection at fracture were recorded.
Results: The highest breaking load and highest deflection were recorded for the cementing technique with values of 25.3 N and 394 ㎛, respectively. The corresponding values for the pressed core build-ups and the milled zirconia core build-ups were 22 N and 301 ㎛, and 13 N and 160 ㎛, respectively. All the differences are statistically significant (p=0.05). Regarding the load-dependence of the deflection, the cemented core build-ups again demonstrated the highest value with 15.5 ㎛/N. The difference in the values of 13.6 ㎛/N and 13 ㎛/N recorded for the pressed-on and milled core build-ups, respectively, were statistically insignificant.
Conclusion: In regard to the high fracture resistance of zirconia post, adhesive cementing the core build-up to the post offers a viable alternative to the conventional pressing technique. The elastic bond between the rigid high-strength zirconia post and the core build-up presents an additional advantage.
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KEYWORD
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Zirconia post IPS Empress CosmoPost Celay/copy-milled core build-up fracture resistance
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