The aim of the present study is to evaluate the clinical response of proximal furcations treated with enamel matrix derivative proteins (EMD).

Proximal class-II furcation represents a challeng to periodontal therapy. Studies show that the ultrasonic non-surgical therapy doesn't work in these defects and the guided tissue regeneration therapy with membranes also demonstrates an unpredictable improvement. Therefore, enamel matrix derivative proteins (EMD) have been proposed as a periodontal regenerative procedure due to their fundamental role in cementum development.

Inclusion Criteria:

• Diagnosis of generalized aggressive periodontitis (Armitage, 1999; American Academy of Periodontology, 2015);
• Have undergone a first approach for periodontal treatment (full-mouth ultrasonic debridement);
• Presence of one proximal class-II furcation presenting probing depth > 4 mm and bleeding on probing ;
• Good general health;
• Agree to participate in the study and sign the informed consent form (TCLE) after explaining the risks and benefits;

Exclusion Criteria:

• Systemic problems (cardiovascular alterations, blood dyscrasias, immunodeficiency - ASA III / IV / V) that contraindicate the periodontal procedure;
• Have used antibiotics and anti-inflammatories in the last six months;
• Smoke ≥ 10 cigarettes/day;
• Pregnant or lactating;
• Chronic use of medications that may alter the response of periodontal tissues;
• Indication of antibiotic prophylaxis for dental procedures;

Undecided.