الفهرس 
english title page
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Abstract
The loss of permanent dentition results in a decrease in the horizontal alveolar ridge dimension by time which complicates the process of restoring the missing tooth. There are several ways to solve this problem including onlay grafting, guided bone regeneration and distraction osteogenesis. These techniques need more time and stages and are subjected to many complications. Split-crest is a simple technique and allows for immediate implant placement in the same time and this allows for a less total time needed for finishing the whole treatment.This study was carried out to evaluate the amount of bone width gain after implant placement in narrow maxillary ridges with and without the use of PRF. Fourteen patients were randomly allocated to both groups and 10 implants were placed in each group. CBVT was done before the surgery to accurately measure the buccolingual width of the ridge. A standardized technique including a subcrestal and two vertical releasing incisions were done with full thickness flap reflection. This was followed by a crestal and one or two vertical bony cuts using the piezoelectric device splitting tips. Special drills were wedged between the two plates and conical implants were placed afterwards. In the control group, nothing was placed in the split gap, while in the test group, PRF was prepared using the patient{u2019}s blood sample and was placed in the split gap and under the flap before suturing. After 6 months, CBVT was used to assess the gain in bone width and any loss in the buccal crest bone height. The implant stability was alsso assessed using the periotest. Furthermore, pain and healing were assessed at one and two weeks using the VAS and healing index by Landry et al 1988