الفهرس 
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Abstract
In this study twelve patients were selected from the outpatient clinic of prosthodontic Department, Faculty of Dentistry, Ain Shams University.
Two groups were selected, each group contains six patients.
group A: Completely edentulous maxillary and mandibular ridges with the last extraction preformed at least three months ago.
group B: Patients with completely edentulous maxillary ridge and remaining two mandibular teeth, one on each quadrant, laterals, canines or premolars.
The selected patients were free from any systemic diseases, para-functional habits, smoking habits and temporo-mandibular joint disorder.
In group B patients the two remaining teeth are free from acute periodontal infection and indicated for extraction.
Intra and extra oral examination were done for all patients.
Upper and lower complete dentures were constructed following conventional technique for both groups.
Two implants were inserted at the interforminal area with two ball abutments in group A patients, while in group B patients two implants were inserted immediately after extraction of the two remaining teeth in thier extraction sockets.
Progressive loading were done after implant insertion from the first day of surgery with relieved denture over the abutments then after one week with lower denture relined with soft liner then after six weeks soft liner was replaced with direct pick up of metal housings.
Cone beam tomography was done for the mandible of all patients on the day of implant insertion, three, six and twelve months after implant insertion for measurement of crestal bone changes in contact with implants.
Results were recorded, collected, tabulated and statistically analyzed.
Crestal bone loss of two techniques (immediate implant insertion and delayed implant insertion) showing non-significant difference. Also a continuous bone resorption was observed all the time in both groups.
Crestal bone loss in the labial surface is more than crestal bone loss on the lingual surface in the immediate implant insertion group.
In this study twelve patients were selected from the outpatient clinic of prosthodontic Department, Faculty of Dentistry, Ain Shams University.
Two groups were selected, each group contains six patients.
group A: Completely edentulous maxillary and mandibular ridges with the last extraction preformed at least three months ago.
group B: Patients with completely edentulous maxillary ridge and remaining two mandibular teeth, one on each quadrant, laterals, canines or premolars.
The selected patients were free from any systemic diseases, para-functional habits, smoking habits and temporo-mandibular joint disorder.
In group B patients the two remaining teeth are free from acute periodontal infection and indicated for extraction.
Intra and extra oral examination were done for all patients.
Upper and lower complete dentures were constructed following conventional technique for both groups.
Two implants were inserted at the interforminal area with two ball abutments in group A patients, while in group B patients two implants were inserted immediately after extraction of the two remaining teeth in thier extraction sockets.
Progressive loading were done after implant insertion from the first day of surgery with relieved denture over the abutments then after one week with lower denture relined with soft liner then after six weeks soft liner was replaced with direct pick up of metal housings.
Cone beam tomography was done for the mandible of all patients on the day of implant insertion, three, six and twelve months after implant insertion for measurement of crestal bone changes in contact with implants.
Results were recorded, collected, tabulated and statistically analyzed.
Crestal bone loss of two techniques (immediate implant insertion and delayed implant insertion) showing non-significant difference. Also a continuous bone resorption was observed all the time in both groups.
Crestal bone loss in the labial surface is more than crestal bone loss on the lingual surface in the immediate implant insertion group.