Supportive periodontal therapy in moderate‐to‐severe periodontitis patients: A two‐year randomized clinical trial

Abstract Aim Evaluate supportive periodontal therapy ( SPT ) consisting of oral prophylaxis with oral hygiene instructions as sole intervention (test) or combined with subgingival instrumentation removing/disrupting the subgingival biofilm (control). Material and Methods Sixty‐two treated periodontitis patients (50.97 ± 9.26 years, 24 smokers) were randomly assigned to receive, every 3 months during 2 years, either test or control treatment. Examination included periodontal probing depth ( PPD ), bleeding on probing ( BOP ) and clinical attachment loss ( CAL ). Generalized estimating equations were used for analyses. Results Baseline demographics and smoking were similar between groups. However, at baseline, mean PPD was greater in test group than in control group (2.32 mm vs. 2.17 mm, p = .03), but similar after 2 years (2.23 mm vs. 2.15 mm, respectively). With time, significant PPD and BOP decrease and CAL increase were observed although without significant differences between groups. At sites ≥ 5 mm, PPD decrease was greater in test group than in control group irrespective of sex and smoking habit ( p = .034). The distribution of sites gaining or losing attachment ±2 mm was similar between groups. Conclusion Oral prophylaxis with oral hygiene instructions alone or in combination with subgingival instrumentation was able to maintain the previously obtained periodontal condition to a comparable extent during 2 years of SPT .