Are Salivary Gland Ultrasonography Scores Associated with Salivary Flow Rates and Oral Health Related Quality of Life in Sjögren's syndrome?

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Ultrasonography of major salivary glands (SGUS) is a widely used imaging technique to evaluate salivary gland involvement in primary Sjögren's syndrome (pSS). The aim of this study was to evaluate the relationship between SGUS, salivary flow rate (SFR) as an objective measure of the gland function and oral health-related quality of life (OHRQoL) as a patientreported outcome measure (PROM) in a pSS cohort.Sixty-six patients with pSS were examined by SGUS according to Hocevar and Milic scoring systems. Patients with inhomogeneity/hypoechoic areas with scores ≥2 in parotid and submandibular glands were classified separately as severe glandular involvement. Furthermore, oral health, SFR and oral health impact profile-14 (OHIP-14) for OHRQoL were assessed.Both total Hocevar and Milic scores were higher in 21 pSS patients with low unstimulated whole salivary flow rate (U-WSFR) than 45 pSS patients without low U-WSFR (p=0.001 and p<0.0001, respectively). Increased scores of homogeneity, hypoechoic areas and glandular border visibility were observed in patients with low U-WSFR (p<0.05). Among these variables, homogeneity score was found to be an independent risk factor for low UWSFR in pSS according to logistic regression analysis (OR:1.586, p=0.001). Moreover, a higher OHIP-14 score was observed in severe parotid involvement compared to non-severe ones (23.26 ± 21.19 vs 8.32 ±13.82, p=0.004).High Milic and Hocevar SGUS scores are associated with reduced SFRs and poor OHRQoL as a PROM. US inhomogeneity of salivary glands is associated with low UWSFR and is a good indicator of severely affected gland function.


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