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Comparison of the retention force reduction before and after cyclic testing at the same tooth position.
| Group | Initial (N) | Terminal (N) | Reduction (N) | P |
|---|---|---|---|---|
| PEEK 44(n = 10) | 4.61 | 4.15 | 0.46 | ＜0.001 |
| Co–Cr 44(n = 10) | 47.50 | 13.90 | 33.60 | |
| PEEK 46(n = 10) | 3.38 | 2.93 | 0.45 | ＜0.001 |
| Co–Cr 46(n = 10) | 28.79 | 11.56 | 17.23 |
*There was a significant difference in the decrease in retention between the PEEK clasps and Co–Cr alloy clasps during fatigue cycles at the same tooth position.
