Abstract: Objective: To analyze and evaluate the effects of two different extraction site preservation methods on the aesthetic effect of alveolar bone and alveolar bone resorption in the sockets with three-wall bone defects. Methods: 18 cases of minimally invasive extraction were selected. They were divided into 2 groups: GBR site preservation with flap (group A), site preservation with flapless (group B). Observe the soft tissue healing after surgery, the aesthetic effect of alveolar surgery at 5 months after surgery and alveolar bone resorption. Results: (1)The soft tissue in group A healed well after surgery, but the soft tissue in group B was not completely closed in the early stage. (2)The alveolar aesthetic effect of group A was better than that of group B(p<; 0.05). (3)The increased height of alveolar bone in group A was 7.33±; 0.21mm, in group B was 4.02±; 0.31mm. There were significant differences between the two groups(p<; 0.05). The reduced width of alveolar bone in group A was 0.47±; 0.14mm, in group B was 2.25±; 0.62mm. There were significant differences between the two groups(p<; 0.05). Conclusion: When the extraction sockets were three-wall bone defects in the anterior area and maxillary premolars area, the clinical effect of GBR site preservation with flaps was better than site preservation with flapless.

Key words: site preservation, tooth extraction, aesthetic area