الفهرس 
IntroductionOnly 14 pages are availabe for public view
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Abstract
Evaluation of CAD/CAM versus injection molding techniques of polyetheretherketone (PEEK) sub-periosteal implant retaining maxillary fixed prosthesis. Statement of problem: Patients’ needs dental rehabilitation of a complete atrophic maxilla would benefit from simplified treatment plans.>Purpose. The aim of this study was to evaluate of CAD-CAM versus injection moulding techniques of polyetheretherketone (PEEK) subperiosteal implant retaining a maxillary fixed prosthesis for 6 edentulous patients with severe maxillary ridge resorption who declined multiple stage surgery and sought a fixed prosthesis in single stage surgery.Material and Methods. Six patients were provided with 3 maxillary subperiosteal implants made by CAD-CAM and the other 3 subperiosteal implants were made by injection moulding technique, which were surgically placed in a 1-step procedure. After complete healing and remodeling of the soft tissue, maxillary impression was made with a single stage putty wash material to make the definitive prosthesis. Evaluation of peri-abutment probing depth and immunological markers (TNF-a and IL-8) peri-abutment crevicular fluid around the abutments was done for 1 month, 3 months, 6 months and 12 months after subperiosteal implant surgical placement. Results. There was no significant difference between CAD-CAM and injection moulding technique of polyetheretherketone sub-periosteal implant regarding the probing depth, TNF-α and IL-8 peri-abutment crevicular fluid. Within each group, regarding peri-abutment probing depth there were statistically significant increase of probing depths around abutments after 3 months then insignificant increase of probing depth after 6 and 12 months. Regarding TNF-a and IL-8 there was significant decrease of TNF-a vales after 3 month, then there was insignificant decrease after 6 and 12 months. Conclusion. PEEK subperiosteal implants for maxillary atrophied ridges constructed with CAD-CAM or injection molding technique can be considered a promising treatment option within the limitations of this clinical study with low patient numbers and a short observational time.