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Updated: Feb 5, 2026

Synthesis and Characterization of Functionalized Metal-organic Frameworks
Published on: September 5, 2014
Comparing Retention and Internal Adaptation of Different Implant-Supported, Metal-Free Frameworks
Purpose:
This study was conducted to compare the fit and retention of implant-supported, metal-free copings fabricated from zirconia, polyetheretherketone (PEEK), or composite, as well as to evaluate the possible correlation between internal adaptation and retention.
Materials And Methods:
A total of 36 copings were milled from zirconia, PEEK, or composite blanks (n = 12 in each group). Marginal and internal gap were evaluated by replica technique, and the pull-out test was used to evaluate retention. One-way analysis of variance, post hoc Tukey tests, and Pearson correlation coefficient test were used to analyze the data.
Results:
Zirconia had significantly better marginal/internal adaptation (P < .05) than the other materials. There was no statistically significant difference in mean retention force between the different groups (P > .05). No correlation was found between internal adaptation and retention.
Conclusion:
In the metal-free copings tested, zirconia showed the best adaptation. The retention of copings was not influenced by internal fit or material type.
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