الفهرس 
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Abstract
This experimental study was carried out to compare the fracture resistance and stress distribution induced by polyether ether ketone (PEEK) versus polyether ketone ketone (PEKK) used in extra coronal attachment of partial denture in Kennedy class II.
Two 3D printed mandibular Kennedy’s class II models with the mucosa simulator and prepared detachable abutments mandibular canine and first premolar were used in this study where a mandibular kennedy class II experimental model was digitally scanned. On the software, the preplanned design for Kennedy’s class II was done. The main abutments were removed from the virtual model and prepared separately to have die sperate STL file to be superimposed in their corresponding sockets in the previous model STL file.
Two strain gauge slots were designed virtually to receive the strain gauge rosettes. The first one (slot I) was placed 1mm distal to the socket of the first premolar and the second slot (slot II) 1 cm distance away from the first one. Two models and two sets of teeth were 3D printed. The 3D printed teeth were then scanned. The attachment design was selected from software library. The splinted crowns and selected attachment design were digitally designed. The lingual surface of the first premolar crown was prepared to receive lingual guiding arm. The splinted crowns and attachment were milled out of PEEK and PEEK materials. Forty four RPDs were constructed digitally where twenty two from PEEK and twenty two from PEKK.
The strain gauges were placed in their slots on the distal aspect of the abutment and the crest of the ridge. The load applied was 100 N at constant rate 0.5mm/min. The load was applied unilateral. For each removable partial denture, five measurements were made. The data obtained were statistically analyzed by using unpaired t test to study the difference between group mean values (p< 0.05). Microstrain readings for each group were recorded and statistically analyzed.
Unpaired t test showed statistical significance between both materials in slot I and II during unilateral loading p=0.0001.
During bilateral loading, Unpaired t test showed statistically significant difference between the PEKK and PEEK groups in slots I and II p=0.0001.
During facture resistance loading measurement, Unpaired t test showed statistically significant difference between the PEKK and PEEK p=0.0001.