Adjunctive Laser for Periodontal Intrabony Defects

Inclusion Criteria: * Minimum of 20 teeth. Diagnosis of Severe Periodontitis (Diagnosis of Periodontitis stage III or IV (grade A, B or C) (Tonetti et al. 2018) Presence of at least 2 teeth with ≥ 6 mm pockets and minimum of 3 mm intrabony defect, in opposing quadrants of the upper or lower arch. Exclusion Criteria: * Inclusion: Minimum of 20 teeth. Diagnosis of Severe Periodontitis (Diagnosis of Periodontitis stage III or IV (grade A, B or C) (Tonetti et al. 2018) Presence of at least 2 teeth with ≥ 6 mm pockets and minimum of 3 mm intrabony defect, in opposing quadrants of the upper or lower arch. Exclusion: * Wearing of a removable appliance/denture * Wearing of orthodontic appliances. * Current smoking - any history of smoking or vaping within last 5 years * Relevant medical history likely to affect periodontal disease or taking relevant medication, including diabetes, as judged by the examining clinician * Periodontal treatment (surgical/non-surgical root surface debridement under local anaesthesia) within last 12 months, as judged by the examining clinician * History of any antibiotic use within last 3 months. * Pregnant patients * Teeth with hopeless prognosis indicated for extraction (Cortellini et al 2011) * Patients with a non-adequate level of English