This pilot study assessed the oral-health-related-quality-of-life (OHRQoL) after long-term periodontal therapy and explored OHRQoL-differences along the 2018 Classification of Periodontal Diseases.
61 patients were examined before (T0) and after active periodontal therapy (APT/T1) and 32.0±2.9 [range: 27-38] years of supportive periodontal therapy (SPT/T2). Periodontal diagnosis at T0 was assessed according to the 2018 Classification of Periodontal Diseases (stage 1/2/3/4: n=1/3/44/13; grade n=A/B/C: 0/8/53). OHRQoL at T2 was measured using the Oral Health Impact Profile-G14 (OHIP-G14). Patients’ Eichner’s classification, accumulated tooth loss and treatment outcomes (SSO criteria) were assessed at T2. Generalized linear modelling (GLM) assessed associations between different factors and OHrQoL.
Mean OHIP-G14 sum score was 3.7 (SD 5.6)). There was no statistically significant association between OHIP-G14 and gender, stage, SSO criteria and tooth loss. OHIP-G14 was significantly lower in older patients (-0.2[-0.3;0] per year, p=0.008), non-smokers (-5.9[-9.9;-1.9], p=0.003) and former smokers (-7.4[-11.6;-3.2]; p<0.001) versus current smokers, patients with Eichner class A1-B2 versus C2 (p<0.05), sufficient adherence during SPT (-2.3[-4.6;-0.1], p=0.044) versus insufficient ones. Patients with grade B (4.4[1.3;7.4]; p<0.005) showed higher OHIP-G14 than those with grade C.
A number of aspects, grounded in the initial diagnosis, the adherence to SPT, the resulting dentition, socio-demographic and behavioral covariates, were associated with good OHrQoL.

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