Effect of Glycine Subgingival Sandblasting on the Incidence of Peri-Implantitis and Expression of Inflammatory Factors in Gingival Crevicular Fluid in Patients with Titanium-Nickel-Chromium Alloy Porcelain-Fused-To-Metal Crowns

Abstract

This research was aimed to demonstrate impacts of glycine subgingival sandblasting on peri-implantitis (PI), periodontal clinical parameters, and inflammatory factor expression in gingival crevicular fluid (GCF) in patients with titanium-nickel-chromium (TiNiCr) alloy porcelain-fused-to-metal crown (APC) restorations. A total of 159 patients with TiNiCr APCs were randomly rolled into glycine subgingival sandblasting group (Exp 1 group), erythritol subgingival sandblasting group (Exp 2 group), and conventional scaling and root planing (SRP) treatment group (Con group), with 53 patients in each group. The quantity of oral biofilm was assessed based on plaque staining, and the plaque index (PLI), bleeding index (BI), probing depth (PD), and clinical attachment level (CAL) preoperatively (baseline) and at 3-, 6-, and 12-months postoperatively in various groups were compared. Microbial species and quantities in the GCF were determined using microbial counting, and the incidence of PI postoperatively was calculated in each group. The inflammatory cytokines tumor necrosis factor-alpha (TNF-α), interleukin (IL)-1β, and IL-6 in the GCF were measured using enzyme-linked immunosorbent assay (ELISA). The results showed that at 3-, 6-, and 12-months postoperatively, the PLI, BI, PD, CAL, TNF-α, IL-1β, and IL-6 in Exp 1 group were dramatically inferior to those in Con group (P < 0.01). The PLI, BI, PD, CAL, bacterial counts (rods, cocci, and spirochetes) in Exp 2 group were inferior to those in Con group (P < 0.05) at the same time points. Furthermore, the PLI, BI, PD, CAL, TNF-α, IL-1β, and IL-6 in Exp 1 group were inferior to those in Exp 2 group (P < 0.05) at 3-, 6-, and 12-months postoperatively. The incidence of PI postoperatively in Exp 1 and Exp 2 groups was 5.66% and 3.77%, respectively, which was dramatically inferior to Con group’s incidence of 9.43% (P < 0.05). These findings indicate that glycine subgingival sandblasting can greatly enhance the periodontal condition of patients undergoing TiNiCr APC restorations, reduce the incidence of PI, and lower the levels of inflammatory factors in the GCF.