الفهرس 
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Abstract
Purpose : This study was aimed to evaluate retention forces and radiographic vertical alveolar bone height changes of abutment teeth using two different CAD-CAM removable partial denture (RPD) framework materials. Materials and Methods : Twelve patients were selected for this study with maxillary completely edentulous arch against mandibular distal extension ridges posterior to first premolar teeth. The patients were equally divided into two groups according to the RPD framework material used where ( group A) received CAD CAM wax pattern frameworks cast into Cr-Co and (group B) received CAD-CAM PEEK frameworks. For each framework, the force of retention was evaluated by digital forcemeter at time , one month and 3 months of RPD insertion while the abutment teeth vertical alveolar bone heights were evaluated radiographically at time, 6 months and 12 months of denture insertion. Results: - There was a statistically insignificant difference in retentive forces between measurement intervals for both groups. - There was a statistically significant difference in retention values as well as abutment crestal alveolar bone resorption between the two groups at all intervals of measurements. - There was a statistically significant difference in abutment crestal alveolar bone resorption for both groups at all evaluation intervals. Conclusion: from an alveolar bone preservation point of view , PEEK material is a reliable material to be used as an RPD framework material although it showed lower retentive values in comparison to Co-Cr frameworks at all intervals of study.