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Open research questions in Salivary Gland Disorders and Functions

80 unresolved questions extracted from the limitations and future-work sections of 1,008 Salivary Gland Disorders and Functions papers in our library. Each links back to the study that raised it.

What the literature leaves open

  • There are however limited, and conflicting data on the specific risk factors for PDs in SS which might be linked to severity of organ involvement, with respect to type distribution.

    Incidence, risk factors, and correlation with organ involvement of psychological disorders in patients with Sjögren’s syndrome · 2026 · DOI

  • Although anti-CENP-B antibodies are traditionally recognized as serological markers of SSc and PBC, their clinical significance in pSjD remains incompletely understood.

    Anti-centromere protein B antibody positivity in primary Sjögren’s disease: clinical features and prognostic implications · 2026 · DOI

  • This study has several limitations that should be consid- ered when interpreting the findings. First, the retrospective design introduces the potential for selection and information bias, particularly given the reliance on available medical records and incomplete documentation of certain clinical and imaging variables. Second, the study was conducted at a single tertiary care center, which may limit the generaliz- ability of the findings to other settings, particularly primary or secondary care populations where referral patterns and disease spectrum may differ. Third, not all patients under- went standardized objective assessments such as Schirmer testing, ocular staining score, or salivary flow measurement, which may have limited the ability to evaluate their com- plete relationship with histopathological findings. Fourth, anti-SSA antibody data were available for only a subset of patients (n = 94), which limits the statistical power to draw firm conclusions regarding its association with biopsy results, and the possibility of selection bias in this subgroup cannot be excluded. Finally, imaging data, particularly sali- vary gland ultrasonography, were available for only a subset Page 9 of 11 151 of patients, restricting conclusions regarding their diagnos- tic contribution.

    Patterns of referral and histopathological interpretation of minor salivary gland biopsy in suspected Sjögren’s disease: a single-center experience · 2026 · DOI

  • Future research should focus on large-scale prospective studies to validate optimal cut-off values for salivary IL-1β and TNF-α as diagnostic markers for PCOS, along with intervention 11 The Journal of medical and Oral Biosciences CC BY-SA 4.

    Comparative Analysis of Traditional and Emerging Salivary Biomarkers in Polycystic Ovary Syndrome Diagnosis · 2026 · DOI

  • The limitation of the current study was not establish causality between elevated biomarkers and PCOS; therefore, longitudinal studies are needed to determine whether increased salivary cytokines appear before or after the development of the syndrome. Although the findings were statistically significant, the relatively limited sample size suggests that larger, multi-center studies are necessary to validate the diagnostic thresholds identified through ROC analysis. Moreover, absence of paired serum cytokine measurements limits the ability to directly correlate salivary inflammatory marker levels with systemic circulation, even though previous literature suggests such correlations exist.

    Comparative Analysis of Traditional and Emerging Salivary Biomarkers in Polycystic Ovary Syndrome Diagnosis · 2026 · DOI

  • Uncertainty management strategies for anxious/hypervigilant patients are described conceptually but lack randomized controlled trial evidence specifically in BMS populations.

    Burning Mouth Syndrome 2026: From “Diagnosis of Exclusion” to a Structured Diagnostic Algorithm (Narrative Review) · 2026 · DOI

  • Evidence for BMS treatments is often extrapolated from chronic pain literature rather than derived directly from BMS populations, limiting directness of applicability.

    Burning Mouth Syndrome 2026: From “Diagnosis of Exclusion” to a Structured Diagnostic Algorithm (Narrative Review) · 2026 · DOI

  • No significant relation was found between RA disease severity (RF positivity, joint erosions) and SS-related parameters, an unexpected finding that warrants further investigation.

    Ultrasonography of the salivary glands in the diagnosis of Sjögren’s syndrome secondary to rheumatoid arthritis – a probabilistic approach · 2025 · DOI

  • The exact causes of BMS are not well understood, but research suggests they may have a multifactorial nature, involving neuropathic, endocrinological, and psychosocial factors.

    Burning mouth syndrome - causes and modern treatment methods · 2023 · DOI

  • Presumptive tests for salivary α-amylase (SAA) exist; however, these tests are generally unsuited for use at crime scenes or have not been tested on realistic expirated bloodstains.

    Evaluation of the RSID<sup>TM</sup>-Saliva test to detect saliva in expirated bloodstains and development of an ‘in-scene’ protocol · 2020 · DOI

  • In order to improve the quality of clinical trials, future research should focus on establishing consensus for a single definition of BMS that includes specific inclusion and exclusion criteria that should be used to select study participants for clinical trials.

    World Workshop on Oral Medicine VII: Burning mouth syndrome: A systematic review of disease definitions and diagnostic criteria utilized in randomized clinical trials · 2019 · DOI

  • Nitric oxide (NO) is known to have an important role in cardiac function and may also be assessed in the saliva, but its participation in physiological responses to hypothalamic-pituitary-adrenal (HPA) axis stimulation is still not completely understood.

    Salivary cortisol and nitrite concentrations in school teachers: A longitudinal pilot study · 2018 · DOI

  • Since the etiology of BMS has not been elucidated, to understand the characteristics of BMS, we measured some components of saliva and taste sensitivity and compared the measured values between BMS and healthy subjects.

    Characteristic changes of saliva and taste in burning mouth syndrome patients · 2015 · DOI

  • Botulinum toxin A (BTXA) has been used in several clinical trials to treat excessive glandular secretion; however, the precise mechanism of its action on the secretory function of salivary gland has not been fully elucidated.

    Botulinum toxin A inhibits salivary secretion of rabbit submandibular gland · 2013 · DOI

  • BACKGROUND: Previous studies reported alterations in salivary flow rate and biochemical parameters of saliva in cerebral palsy (CP) individuals; however, none of these considered the type of neuromotor abnormality among CP individuals, thus it remains unclear whether the different anatomical and extended regions of the brain lesions responsible for the neurological damage in CP might include disruption of the regulatory mechanism of saliva secretion as part of the encephalopathy.

    Does the neuromotor abnormality type affect the salivary parameters in individuals with cerebral palsy? · 2010 · DOI

  • Burning Mouth Syndrome (BMS) is a chronic orofacial burning pain condition usually in the absence of clinical and laboratory findings that affects many adults worldwide, yet its etiology and treatment remain poorly understood.

    Burning mouth syndrome: Clinical dilemma? · 2008 · DOI

  • It has shown that ductal stricture formation accounts for almost 25% of cases of benign salivary obstruction and appears to have been an under-recognized condition.

    Salivary duct strictures: nature and incidence in benign salivary obstruction · 2007 · DOI

  • Although very few studies have been focused on the analysis of SS early clinical onset, a series of oral features preceding xerostomia/hyposalivation development in patients eventually diagnosed as having SS have been reported.

    Sjögren's syndrome: the diagnostic potential of early oral manifestations preceding hyposalivation/xerostomia · 2004 · DOI

  • The reasons why some of the OSF patients have high titers of autoantibodies in serum have not been completely explained and no further study on autoantibodies in OSF patients has been done in a large group of patients.

    High incidence of autoantibodies in Taiwanese patients with oral submucous fibrosis · 2002 · DOI

  • Objections to its use have included the fact that it is "impure", that it does not adequately represent what is present in the salivary glands, that no standards have been established for its rate of flow, and that findings based on it lack specificity.

    The Use of Whole Saliva in the Differential Diagnosis of Sjögren's Syndrome · 1996 · DOI

  • Even though the role of the psychological component in this condition is unquestionable, further research is suggested to completely clarify the complex etiology behind burning mouth syndrome.

    ANXIETY AND DEPRESSION SCORES IN PATIENTS WITH BURNING MOUTH SYNDROME · 2108 · DOI

  • The prevalence of both conditions varies greatly within different studies. One of the main reasons might be the use of different evaluating tools (questionnaires) and number of the subjects participating in the studies.

    ANXIETY AND DEPRESSION SCORES IN PATIENTS WITH BURNING MOUTH SYNDROME · 2108 · DOI

  • Future research should focus on improving diagnostic consistency and sample representativeness to enable more consistent and robust estimates, and thereby better guide prevention and care in geriatric oral health.

    A Systematic Review and Meta‐Analysis of the Global Prevalence of Dry Mouth in Older Adults · 2026 · DOI

  • The minimal outcome tracking set proposed (burning intensity, distribution, dryness, taste, sleep, psychological distress, adverse effects) lacks validation regarding which metrics are most predictive of treatment response and clinical outcomes.

    Burning Mouth Syndrome 2026: From “Diagnosis of Exclusion” to a Structured Diagnostic Algorithm (Narrative Review) · 2026 · DOI

  • Maślińska M, Przygodzka M, Kwiatkowska B, Sikorska-Siudek K (2015) Sjögren’s syndrome: still not fully understood disease.

    High prevalence of subclinical salivary gland ultrasound abnormalities in systemic lupus erythematosus: implications for the diagnosis of secondary Sjögren’s syndrome · 2026 · DOI

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80 open questions have been extracted from the limitations and future-work passages of 1,008 Salivary Gland Disorders and Functions papers in our library. Each one below links back to the study that raised it, so you can read the original claim in context.

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