الفهرس 
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Abstract
Summary
This study was conducted to compare the effect of two different implant surface treatments on implant stability changes using the All on Four concept during the follow up period of 6 months.
Fourteen patients were selected from the outpatient clinic of Oral and Maxillofacial prosthodontic Department, Faculty of Dentistry, Ain Shams University.
Two groups were randomly divided, each group contains seven patients.
• group I: Completely edentulous patients rehabilitated with maxillary complete denture and mandibular implant supported overdentures using All on Four concept with dental implants treated with DMLF technique.
• group II: Completely edentulous patients rehabilitated with maxillary complete denture and mandibular implant supported overdentures using All on Four concept with dental implants treated with Acid Etching technique.
The selected patients were free from any systemic diseases, para-functional habits, smoking habits and temporo-mandibular joint disorder. Intra and extra oral examination were done for all patients.
Guided Surgery was done by flapless technique using tissue supported surgical guide.
Immediate loading was done after implant insertion from the first day of surgery with a provisional prothesis over the implants.
The patient’s own denture was converted into a fixed provisional prosthesis on the day of surgery by creating access holes which was filled by pick up material to pick up the temporary sleeves later on.
The osstell was used for measurement of implant stability in all patients on the day of implant insertion, three and six months after implant insertion.
Results revealed statistically insignificant difference in implant stability between both groups at insertion, while there was a significant difference between both groups after three and six months follow up. The implant stability of group I was significantly higher than group II in straight and angled implants.
Moreover the results revealed that there was an insignificant difference between straight and angled implants in group I at insertion, after 3 months and after 6 months. In group II the stability of straight implant was insignificantly higher than angled implants at insertion after 3 months and after 6 months.