Abstract: PURPOSE: To evaluate the clinical effect of subgingival sandblasting with glycine powder on prevention of peri-implantitis. METHODS: One hundred and eight patients underwent dental implantation at First Outpatient Department from January 2017 to January 2018 were divided into 3 groups, i.e., subgingival sandblasting group(group A,n=60), subgingival ultrasound group (group B, n=60) and control group (group C, n=60). The occurrence of peri-implantitis among 3 groups was compared. Statistical analysis was conducted with SPSS 17.0 software package. RESULTS: Eighteen months after dental implantation, the rate of peri-implantitis in subgingival sandblasting group was significantly lower than that of subgingival ultrasound group and control group (P=0.04). There was significant difference in probe depth, bleeding index and plaque index among the three groups(P<0.05). CONCLUSIONS: Subgingival sandblasting with glycine powder can significantly reduce the occurrence of peri-implantitis, and can be an effective maintenance method for implant denture.

Key words: Glycine powder, Subgingival sandblasting, Subgingival ultrasound, Peri-implantitis