Objective: To evaluate clinically and radiographically an alveolar ridge preservation technique with deproteinized bovine bone graft and absorbable collagen membrane, then restoration with delayed implants.Methods: The study included 30 patients.The trial group sockets were filled with deproteinized bovine bone graft (BioOss(R)) and covered with absorbable collagen membrane (Bio-Gide(R)).The control group sockets healed without any treatment.Panoramic radiograph and computed tomography (CT) were taken immediately after graft and 3, 6 months later to evaluate the height, width and volume change of alveolar ridge bone.Dental implants were inserted in all sockets at 6 months and osseointegration condition was evaluated in the followed 12 months.Dental implant stability was evaluated with resonance frequency analysis and compare implant stability quotient (ISQ) of 2 groups.We took normal dental apical film to evaluate the alveolar ridge bone resorption around dental implant neck at the same time.The degree of bone resorption was contrasted with dental implant thread.