Abstract: Objective: To study the soft and hard tissue stability of flapless immediate implant and immediate restoration of single tooth in maxillary aesthetic area. Methods: 26 single implants in maxillary aesthetic area were included. All of the implants were placed immediately into fresh extractions and and immediately restoration, digital scanning to make temporary restorationsimmediately,The final restorations were performed after 6 months with all-ceramic crown, Control group selected intraoral dental health with the same name. On different time of follow-up, observation of probing depth(PD), modified plaque index (mPLI), modified sulcus bleeding index(mBI), gingival position, marginal bone loss. Results: The 26 implants were obtained the good stability of the soft and hard tissue and the aesthetic effect. The survival rate of both groups were 100%. The PD、mPLI、mBI value of 1, 3, 6, months was significantly higher than that of natural teeth, there was a significant difference(P<0.05), The mBI value of 36 months as significantly higher than that of natural teeth, there was a significant difference(P<0.05). The peri implant gingival degenerate 0.31mm the first 3 months than preoperative, gingival growth 0.05mm in 3-6 months, three years of gingival recession 0.36mm,midfacial papillaloss more than the distal or mesial papilla. Peri implant marginal bone loss 0.81mm with in three months after operation, Absorbed 0.97mm at 1 year. Conclusion: Flapless immediate implant and immediate prosthesis can maintain good soft and hard tissue stability, it was worth clinical promotion.

Key words: immediate implant, immediate prosthesis, tissue Engineering biomaterials, marginal bone loss, retrospective study