الفهرس 
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Abstract
The aim of this in vitro study was to evaluate the retentive
force of modified PEEK and acetal constructed by CAD /CAM
technology. Twenty digital partial frameworks were constructed
from PEEK (group A) and acetal (group B), ten in each group. The
retentive force for each framework was measured on its epoxy cast
after insertion by using universal testing machine. Universal testing
machine was pulled out framework in unilateral and bilateral
direction from the hooks placed occlusally.
Data was calculated and recorded using computer software
blue hill universal instron.
The results of the retentive force showed a statistically
significant difference between the two groups. group A (PEEK)
showed a higher mean retentive force of 7.609 N than group B
(acetal) 1.373 N in bilateral direction. group A (PEEK) showed a
higher mean retentive force of 4.553 N than group B (acetal) 0.486
N in right side. group A (PEEK) showed a higher mean retentive
force of 3.702 N than group B (acetal) 0.758 N.
Summery & Conclusion
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Conclusion
Within the limitations and conditions of this in vitro study, it
was concluded that:
1 PEEK digital frameworks showed higher retention than acetal
digital frameworks in unilateral and bilateral measurement.
2 PEEK should be considered as a substitute framework material
for a well-designed Cr-Co RDP for patients with taste
sensitivity or allergies to conventional Cr-Co frameworks.
Suggestions for further studies:
It would be beneficial to support these findings with clinical
studies.
More investigations are still required for different clasp
thickness, techniques, and thermoplastic materials like Polyether-keton-keton (PEKK)