Abstract: PURPOSE: To investigate the relationship between dental implant mucosa (DIM) and dental implant papilla (DIP) levels and peri-implant soft tissue stability. METHODS: A total of 86 patients with tooth implant in Qingdao Haici Hospital from January 2015 to January 2019 were enrolled, the patients were followed up from initial treatment till December 2020. Various indexes were recorded at the implantation moment(T0), 4 weeks(T1), 2 years(T2) after implantation and end of follow up (T3), including marginal bone loss levels (MBLs), mid-buccal mucosal levels (MBMLs), modified sulcus bleeding index(mSBI), modified bleeding index(mBI) and implant stability quotient (ISQ). Then the correlation of those indexes was analyzed. SPSS 23.0 software package was used to analyze the data. RESULTS: The follow-up period was 1.0-5.2 years, with an average of (4.79±0.34) years; two cases were lost to follow up, and finally 84 cases (95 implants) were included. Compared with indexes at T0, mSBI, mPLI, mBI, the level of distal bone adjacent to the tooth contact point, and the middle bone level adjacent to the tooth contact point at T1, T2, and T3 decreased significantly(P<0.05), and DIP height increased significantly; PD, MBLs and MBMLs at T0, T1, T2, and T3 showed no significant difference(P>0.05). The level of distal bone adjacent to the tooth contact point, and the middle bone level adjacent to the tooth contact point had an impact on DIP(P<0.05). There were 49 cases with papillae gain in height and 46 cases with papilla that lost height. ISQ of gain height group and loss height group was relatively high at T0(P<0.05). Compared with T2, there was a decrease in ISQ in both groups at T1(P<0.05). ISQ of gain height group was significantly higher than that of loss height group at T1 and T2 (P<0.05). CONCLUSIONS: There is a dependent correction between dental implant mucosa and dental implant papilla levels, and the stability of peri-implant soft tissues depends on keratinized tissue height and DIP height.

Key words: Implant mucosa, Dental implant papilla, Peri-implant soft tissue, Stability