Guided Tissue Regeneration With a Periodontal Dressing

Inclusion Criteria: * Age between 18 and 75 years. * A minimum of 18 teeth, wisdom teeth excluded. * Previously untreated moderate chronic periodontitis (Armitage 1999) with radiographic evidence of generalized alveolar bone loss \>30%. * Presence of at least one pocket with probing pocket depth (PPD) ≥6 mm per quadrant, which was BOP. * Presence of at least three teeth per quadrant. Exclusion Criteria: * Periodontal treatment in the last 3 years. * Antibiotic intake 6 months before • the screening visit. * Pregnancy. Systemic diseases with an impact on periodontal healing (e.g. Dia- betes).