To evaluate the short term adjuvant effect of Er: YAG laser in non surgical treatment of chronic periodontitis.

Thirty patients were included into this split-mouth single blind randomized controlled clinical trial. Teeth in the test group were treated with a single application of Er: YAG laser and scaling and root planing (SRP), while teeth in the control group were treated with SRP alone. Periodontal inflammatory parameters, plaque index, gingival index, and probing pocket depth were measured at baseline, 4-week and 3-month follow-up. Gingival crevicular fluid was collected from the periodontal pockets of teeth.

At 4-week follow-up, probing pocket depth and gingival crevicular fluid showed significant difference between test group and control group (P ＜ 0. 05). At 3-month follow-up, probing pocket depth, plaque index, gingival index, and gingival crevicular fluid showed significant difference between test group and control group (P ＜ 0. 05).

In the short term effect, Er: YAG laser has a certain auxiliary therapeutic effect in the treatment of chronic periodontitis.

To compare the effectiveness of an Er: YAG laser and mechanical debridement for the treatment of peri-implantitis.

22 cases of peri-implantitis patients were divided into 2 groups according to the single blind randomized control principle. The experimental group was treated by Er: YAG laser irradiation, the laser energy was set to 100 mJ/pulse, frequency of 10 Hz; plastic curette and 0. 2% chlorhexidine antimicrobial therapy was used in the control group. Clinical periodontal index test including plaque index, bleeding index, probing depth and clinical attachment level was conducted at baseline, 3 months and 6 months.

At baseline, the difference of clinical periodontal index between the experimental group and the control group had no statistical significance (P ＞ 0. 05). After 3 months of treatment (P ＜ 0. 01) and 6 months (P ＜ 0. 05), bleeding index, plaque index of test group and control group had significant difference. Probing depth was reduced by 3 and 6 months after treatment in both 2 groups, and the probing depth had significant difference (P ＜ 0. 05); while clinical attachment level value showed no statistical significance between the two groups (P ＞ 0. 05).

The research shows that the Er: YAG laser treatment can significantly improve peri implant inflammation level, effectiveness of peri-implantitis control is superior than the mechanical curettage treatment.