الفهرس 
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Abstract
This study aimed to assess mechanically (stress-strain) two different attachment materials using universal testing machine, and biologically (bone level) using cone beam computed tomography in maxillary implant retained overdenture. This research runs in 2 routes “in-vitro, in-vivo”.
Two groups were designed group one and group two, for in- vivo part the patient’s denture was used for surgical guide fabrication and implants were placed at the same places as in the in- vitro part followed by healing period of 6 months then attachment placement and follow up every 6 months for 1 year.
Then the data was collected, tabulated, and statistically analyzed.
For in- vitro part an experimental model was fabricated using the patient’s denture and four implants were planned inside each model for each group followed by printing the models and placement of the implants followed by strain gauge wires application and denture placement and load application.
This study revealed that in-vivo part the results showed lower level of bone resorption in group I suggesting that novaloc attachment reduced bone resorption around the dental implants.
For in vitro part the results showed that group I showed lower strain levels than group one suggesting that novaloc attachment may reduce stresses over maxillary implant retained overdenture.