The Role of Anti-inflammatory Cytokines and Antimicrobial Peptide LL-37 Biomarkers in the Treatment of Periodontal Disease.

Periodontal disease is an infectious pathology that consists of the destruction of the gums and supporting structures around the teeth. There are several mechanisms involved in this process. In healthy conditions there is a balance between the bacteria present in the gums and the defence mechanisms of the host to fight the disease. One of the substances involved in favouring this protective mechanism is a peptide called LL-37. The aim of this study is to find out more about the rol of this peptide during this process by using a non invasive method of analysis consisting of analysing some samples of the fluid existing between the gums and the teeth. This clinical study will take place at the University Clinic at the University Rey Juan Carlos, Alcorcon (Madrid), Spain. Patients that attend the clinic suffering from gum disease will be offered the possibility to participate in this study. A full questionnaire indicating the risks and benefits of participating in the study as well as the management of confidential personal data will be discussed with the participants in full detail. Full consent will be sought before commencing the study. Firstly, all participants will receive a through periodontal (gum) examination to assess if they suffer from periodontal disease and to what extent (severity). Based on this preliminary data, patients will be classified in different categories. Patients will be divided in two groups: * 30 Healthy patients (no signs of periodontitis) * 30 Periodontal patients (subdivided in 2 groups of 30, depending of the severity of their disease: * 15 patients with Stage I-II periodontitis (mild/moderate) * 15 patients with Stage III-IV periodontitis (severe). The intervention will consist on taking samples of crevicular fluid (the fluid found in the space between the gum and the root of the tooth) to quantify the presence of LL-37 as well as IL-4, IL-6, IL-10, which seems to be associated with the defence mechanisms (immunity) of the hos