Abstract: Objective: To investigate the clinical effect of extraction site preservation technique in implant treat-ment. Methods: 86 patients with anterior teeth extraction from July 2016 to August 2017 were randomly divided into two groups. in the control group, implants were not preserved at the extraction site. in the ob-servation group, Bio-Oss collagen implants and Bio-Gide membrane were applied immediately after ex-traction, and temporary dentures were made. The success rate of implantation in 2 groups was retrospec-tively observed. Results: The difference of alveolar bone height and width in the observation group was significantly smaller than that in the control group at 6 months after extraction(P<0.05). After treatment, the implant success rate of the observation group was as high as 100%, and that of the control group was 88.37%. The success rate of the observation group was significantly higher than that of the control group(P <0.05). Six months after treatment, compared with the control group, the PES score and new bone mineral density of the observation group were significantly higher, and the vertical alveolar ridge bone absorption and the lip and palate(tongue) bone absorption were significantly lower(P<0.05). Conclusion: The tech-nique of tooth extraction site preservation can significantly reduce the bone defect caused by tooth extrac-tion, create better conditions for new bone formation, and consequently effectively preserve alveolar bone mass, which is conducive to the effective improvement of implant success rate.

Key words: extraction, dental implant, extraction site preservation technology