Subgingival air polishing (glycine powder) versus minocycline hydrochloride: efficacy in residual periodontal pockets following endoscope-assisted scaling and root planing.

چکیده اصلی

AIMS: To evaluate the effects of subgingival air polishing (glycine powder) or minocycline hydrochloride on periodontal parameters and inflammatory levels in residual periodontal pockets following periodontal endoscope-assisted scaling and root planing. METHODS: This single-center, randomized controlled trial (RCT) enrolled 80 patients with periodontitis(Stage II-IV, Grade A-C), who were randomly assigned at the patient level to four groups: scaling and root planing alone (SRP group), endoscope-assisted SRP (E-SRP group), endoscope-assisted SRP plus minocycline hydrochloride (E-SRP + M group), or endoscope-assisted SRP plus subgingival air polishing (E-SRP + AP group). The primary outcome was mean reduction in probing depth (PD) at 6 months post-intervention in residual pockets (PD ≥ 4 mm at baseline). Periodontal parameters, including probing depth (PD), bleeding index (BI), and clinical attachment loss (CAL), were assessed at 6 weeks, 3 months, and 6 months post-intervention. Inflammatory factors [levels of interleukin-6 (IL-6), tumor necrosis factor-α (TNF-α), C-reactive protein (CRP)] and Porphyromonas gingivalis (P. gingivalis) abundance were quantified at 1, 2, 3, 4, 6 weeks, 3 months, and 6 months post-intervention. Linear mixed-effects models (LMM) with Bonferroni correction for multiple comparisons were used for longitudinal continuous outcomes, and exact P-values, effect sizes (Cohen's d), and 95% confidence intervals (95% CI) were reported. RESULT: Levels of P. gingivalis, IL-6, TNF-α, and CRP in deep periodontal pockets showed a slight increase following endoscope-assisted SRP. However, these levels, as well as the bacterial load, remained significantly lower than those in the SRP-alone group. Additionally, periodontal indices demonstrated greater improvement in the endoscope-assisted group compared to the SRP-alone group at the 6-week follow-up. Comparison between the combination therapy groups (endoscope-assisted SRP plus either minocycline hydrochloride or subgingival air polishing) and the endoscope-assisted SRP-alone group revealed that the combination therapies were superior in reducing both bacterial load and inflammatory factor levels within the first 4 weeks. This superior efficacy extended to periodontal indices after 6 weeks. No significant difference was observed between the two combination therapy groups at any time point. A ≥1 mm reduction in PD was defined as a clinically significant improvement (per 2022 EFP guidelines), with 89.2% of sites in combination therapy groups achieving this at 6 months, vs. 71.7% in the E-SRP group and 55.2% in the SRP group. CONCLUSIONS: Combining E-SRP with glycine air polishing or local minocycline improved periodontal conditions, suppressed early biofilm and inflammation, and promoted healing of deep residual pockets. Both treatments produced equivalent outcomes at all follow-up time points, with stage-specific therapeutic effects observed among patients at different periodontal stages. The 4-week early adjunct approach is practicable in clinical settings and aligns with 2022 EFP guidelines. Based on the present results, glycine air polishing is a reasonable option for Stage II patients, while local minocycline may be better suited for advanced periodontitis. This study provides preliminary data to support early adjunct therapy following E-SRP. The choice of adjunctive therapy should be tailored to individual patient characteristics (e.g., antibiotic sensitivity, periodontitis stage/grade).

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