الفهرس 
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Abstract
Implant - retained prosthesis are designed to ensure that the esthetic and functional needs of the patient are met with minimal discomfort and limited complications.
The purpose of this study was to assess the micromovement of implant prostheses using two superstructure designs, with different provisionalization techniques.
Sixty acrylic blocks were constructed for the study. In each block two titanium single piece implants were in seated. The blocks were divided into two groups according to the superstructure design fixed-fixed FPDs (30 samples) and fixed-free FPDs (30 samples). Each group was subdivided into 3 subgroups according to the type of material used: 1- Resinous CAD/ CAM, 2- Dual cure composite, and 3- Conventional heat cure resin FPDs. Then Each subgroup was further subdivided into two divisions according to the type of temporary cement. Zinc oxide eugenol free cement and Resin based temporary cement.
The results of the study revealed that fixed-free FPDs recorded significantly higher micromovement than fixed-fixed FPDs. Using resin temporary resin cement and Resinous CAD/ CAM FPD significantly decreased the micromovement of implant prostheses. Within the limitations of the present study the following conclusions could be drawn:
• Fabrication techniques and type of material used for provisional restoration influenced the micromovment of implant supported prosthesis.
• Ceramill Temp (PMMA) implant supported bridges showed the lowest vertical micromovment.
• The vertical micromovement increased with the increase of the load falling on the implants.
• The least vertical movements were recorded with wider diameter implants, resin cement and fixed-fixed FPDs.