What this Trial Is About

Over the last 30 years, the prevalence of periodontitis (PE) has increased substantially, including among younger populations, highlighting the need to improve the management of this condition as a chronic disease and to develop techniques that favor its control and stability in the short and long term. After non-surgical periodontal therapy (NSPT), the first phase of PE treatment, residual periodontal pockets may persist, often associated with intraosseous defects, which compromise the tooth's prognosis and are associated with disease progression and increased treatment complexity. Surgical treatment of intrabony defects often results in the formation of long junctional epithelium, weakly attached to the root surface, since true regeneration of periodontal tissues is an unpredictable event and depends on complex biological processes. In recent decades, various biomaterials have been proposed as aids to open-flap debridement (OFD) in the surgical treatment of intrabony defects, with the aim of promoting periodontal regeneration, enhancing clinical results and favoring treatment prognosis. Recently, the combination of polynucleotides (PN) and hyaluronic acid (HA) has emerged as a promising auxiliary strategy to promote periodontal regeneration, due to its biological potential in stimulating cell growth and increasing cell viability. The aim of this controlled, randomized, parallel-group clinical study is to compare OFD alone with its association with xenogenous bone graft or xenogenous bone graft plus gel containing PN/HA in the surgical treatment of intrabony defects in patients with PE (stages III or IV, grades B or C). The patients will be randomly divided into three experimental groups (n=22): control (C), xenogeneic bone graft (XENO) and xenogeneic bone graft plus gel containing PN/HA (R-XENO). The patients will receive NSPT, and after eight weeks will undergo surgical procedures to treat the intrabony defects (baseline). Clinical, radiographic, tomographic and immunological periodontal parameters will be assessed at baseline and after 12 months. The wound healing index will be recorded 1, 2 and 6 weeks after the surgical procedure. Patient-centered outcomes will be assessed by means of a visual analog scale (VAS), applied two weeks after the surgical procedure, and oral health-related quality of life (OHRQoL) questionnaires, applied at the beginning of the study and after 6 and 12 months. At the start of the study and after 6 and 12 months, anthropometric data will be collected, blood pressure (BP) will be measured and questionnaires will be applied to survey socio-demographic and nutritional parameters. The data obtained will be statistically analyzed (p\<0.05).

Polynucleotide + Hyaluronic Acid Gel With Xenogeneic Graft for Intrabony Periodontal Defects