الفهرس 
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Abstract
On partially edentulous mandibular arch representing Kennedy class I classification (bilateral free end saddle)
Two materials were used in construction of RPD was investigated; according to the material used they were classified into two groups:
group (I): CAD/CAM milled Co-Cr RPD framework.
group (II): CAD/CAM milled PEKK RPD framework.
On 3D experimental models simulating patients with symmetrical Kennedy class I with the second premolars the last standing abutment for the evaluation of stresses induced in the supporting structures.
The 3D experimental model was Printed Using 3D printing technology, after scanning of the cast obtained from the patient and Designed to have a 2 mm thickness mucosal space at the edentulous area. After that a stent was fabricated for installation of the mucosa simulator material to the model at the predetermined space for it.
In both groups the RPD frameworks were designed on the Exocad software, and then the STL file was sent to the milling machine. For group (I): five Milled Co-Cr RPD frameworks, while for group (II): five milled PEKK RPD frameworks were constructed.
Strain gauge analysis was conducted using universal testing machine upon application of unilateral vertical load, bilateral vertical load, and oblique load in the central fossa of the first molar.
Strain values were recorded distal to the last abutment and at the distal part of the ridge for the two groups. The data were collected, tabulated, and statistically analyzed. The results were showed that:
During unilateral vertical load application PEKK frameworks show statistically significant higher strains for the non-loaded side abutment and ridge and loaded side ridge while, CO-Cr frameworks Show higher strains on the loaded abutments.
During bilateral vertical load and oblique load application CO-Cr frameworks show statistically significant higher strains than PEKK frameworks on the abutment and the ridge. With the greatest strains were recorded over the abutment.