Association of non-surgical periodontal therapy on patients' oral health-related quality of life-A multi-centre cohort study.

Aim: The aim of this multi-centre cohort study was to investigate the association of non-surgical periodontal therapy (NST) on the oral health-related quality of life (OHRQoL) in general and related to severity of periodontal disease and treatment modalities.

Materials And Methods: One hundred and seventy-two patients with periodontal disease from 18 dental practices were measured before and 6-8 weeks after NST using a standardized and validated OHRQoL instrument (Oral Health Impact Profile-G14, OHIP-G14). Another questionnaire was filled out by the dentists to evaluate the influence of treatment modalities and disease severity.