The aim of the present study is to compare between the effects of the flap and flapless implant surgery on crestal bone resorption.Subjects and methods Patient Selection: The present clinical trial included fourteen patients with age range 25-50 years. The patients presented to replace missing teeth by a dental implant.The selected patients were divided equally into two groups; each group received a total of dental implants: A. Group I: (Flap group) represents seven patients for whom implants were inserted by flap surgery.B. Group II: (Flapless group) represents seven patients for whom implants were inserted by flapless surgery. Patients were recalled after 3 months and 6 months duration to determine if the implant is functionally comfortable. The following clinical parameters were recorded immediately after loading (base line) and at the end of the study:Probing depth - Bleeding index - Plaque Index - Width of the keratinized mucosa - Radiographic Evaluation (Marginal bone level around the implant, Change in bone density around the implant).Results: Regarding the clinical parameters our results showed that after baseline and after 3 months and after 6 months of implantplacement was no significant different between the two groups in probing depth - Bleeding index - Plaque Index - Width of the keratinized mucosa - Marginal bone level around the implant, Change in bone density around the implant.Conclusions: Flapless placement of single-tooth implants has a comparable peri-implant soft tissue health to the conventional flap surgery.1.Regarding peri-implant bone preservation and density, the flapless technique present a short term advantages compared to flap technique.2.The conventional flap technique results in an increased amount of crestal bone loss, increased soft tissue inflammation, edema, and bleeding and consequently soft tissue recession.