Objective The aim of this study was to evaluate clinical effect on dental implant with minimally invasive flapless surgery. Methods Width， height， thickness， quality and quantity of crestal bone in implant area were measured with panoramic tomography, linear tomography and clinical examination. The mucosa depth of implant site was evaluated, bone map was drew and the template for implants was made preoperation. ITI screw implants were placement with the minimally invasive flapless implant surgery. When the torque of implants at insertion ≥35 N•cm, the abutments were connected onto implants, temporary acrylic resin restorations were performed immediately after insertion of implants. The clinical parameters evaluated were total surgical time of single implant, crestal bone changes of X radiograph at preoperation and 4 weeks, 3 months, 6 months, 12 months postoperation; Total surgical time of flapless implant group was also compare to it of control group. Results The average single implant surgical time of flapless surgery was 10.4 minutes and the average surgical time of control group was 25.7 minutes ( P<0.01）. The average follow-up time for flapless group was 12.3 months, marginal bone loss of peri-implant was 0.15 mm, all patients feel comfortable and satisfactory. No implants were lost except one patient has short-term peri-implantitis. Conclusion The method of dental flapless surgery is suitable to good crest bone in quality and quantity, Its procedure is simple and operation time can be shorten greatly. The implant survival rate is as highly as 100% in follow-up time.
