Current Scientific Research Trends on Salivary Biomarkers: A Bibliometric Analysis

A Bibliometric Analysis of Clinical Trials on Salivary Biomarkers for Mental Health (2003-2024)

Mental health conditions, such as depression, anxiety, and stress-related disorders, are often difficult to diagnose and monitor using traditional methods. Salivary biomarkers offer a promising alternative due to their non-invasive nature, ease of collection, and the potential to reflect real-time physiological changes associated with mental health. This bibliometric analysis examines 95 clinical trials on stress biomarkers for mental health, published between 2003 and 2024. The field is characterized by extensive collaboration and global participation, involving 593 authors and publications across 73 journals. Despite a consistent annual publication rate, notable increases in 2011, 2014, and 2018 indicate growing research interest. The United States leads in research output, followed by Australia, Germany, and Japan, with Psychoneuroendocrinology being the most prominent journal. Co-occurrence analysis identified nine research clusters, suggesting diverse directions such as the impact of stress-related hormones, circadian rhythms, mindfulness, various therapies, aging, psychological adaptation mechanisms, exercise therapy, anxiety disorders, and the autonomic nervous system on salivary biomarkers. Key terms such as "biomarkers/metabolism," AND "hydrocortisone/metabolism," AND "saliva/metabolism" were central, with significant activity from 2012 to 2018. This analysis highlights a growing focus on the metabolic processes and therapeutic applications of salivary biomarkers in mental health. This bibliometric analysis calls attention to the promising potential of salivary biomarkers to revolutionize mental health diagnostics and treatment through non-invasive methods, fostering interdisciplinary research, technological advancements, and global health improvements.

Autoinducer-2 produced by oral microbial flora and alveolar bone loss in periodontitis

OBJECTIVE

The aim of this study was to investigate the association between autoinducer-2 (AI-2) of oral microbial flora and the alveolar bone destruction in periodontitis to determine if AI-2 may have the potential that monitor periodontitis and predict bone loss.

BACKGROUND

Plaque biofilm was the initiating factor of periodontitis and the essential factor of periodontal tissue destruction. The formation of biofilms depended on the complex regulation of the quorum sensing (QS) system, in which bacteria could sense changes in surrounding bacterial density by secreting the autoinducer (AI) to regulate the corresponding physiological function. Most oral bacteria also communicated with each other to form biofilms administrating the QS system, which implied that the QS system of periodontal pathogens was related to periodontitis, but the specific relationship was unknown.

METHOD

We collected the gingival crevicular fluid (GCF) samples and measured the concentration of AI-2 in samples using the Vibrio harveyi BB180 bioluminescent-reporter system. To explore the interaction between AI-2 and bone metabolism, we utilized AI-2 purified from Fusobacterium nucleatum to investigate the impact of F. nucleatum AI-2 on osteoclast differentiation. Moreover, we constructed murine periodontitis models and multi-species biofilm models to study the association between AI-2 and periodontal disease progression.

RESULTS

The AI-2 concentration in GCF samples increased along with periodontal disease progression (p < .0001). F. nucleatum AI-2 promoted osteoclast differentiation in a dose-dependent manner. In the periodontitis mice model, the CEJ-ABC distance in the F. nucleatum AI-2 treatment group was higher than that in the simple ligation group (p < .01), and the maxilla of the mice in the group exhibited significantly lower BMD and BV/TV values (p < .05).

CONCLUSIONS

We demonstrated that the AI-2 concentration varied with the alveolar bone destruction in periodontitis, and it may have the potential for screening periodontitis. F. nucleatum AI-2 promoted osteoclast differentiation in a dose-dependent manner and aggravated bone loss.

Bibliometric analysis: Root and root canal morphology using cone-beam computed tomography

OBJECTIVES

This bibliometric analysis aimed to evaluate the leading nations, authors, journals, institutes, highly cited publications, and most commonly used keywords concerning scientific publications based on root and root canal morphology using the CBCT.

MATERIAL AND METHODS

For this bibliometric analysis, an extensive search was carried out on September 25, 2023 using the Scopus database. Pertinent articles in the field were scrutinized after applying inclusion and exclusion criteria. Data were evaluated using Vosviewer and Microsoft Excel.

RESULTS

A literature search revealed the initiation of scientific publication in 2008. Significant contributions made by Saudi Arabia, India, and China concerning the number of publications were seen. Similarly, Jazan University from SA was recognized as the leading institute. The Journal of Endodontics was the leading journal, while authors JNR Martins and G Gambarini produced the highest number of papers.

CONCLUSIONS

This bibliometric analysis demonstrated that scientific publications have increased tremendously since 2008. Significant contributions have been made by developing and developed nations. The Journal of Endodontics and Jazan University have been identified as the leading journal and institute.

Bibliometric analysis on research trends for contribution of photodynamic therapy in periodontitis

BACKGROUND

The objective of this bibliometric was to ascertain the research trend regarding the application of photodynamic therapy as a treatment modality for periodontal disease.

METHODS

An online search was administered using the Scopus database to retrieve all the relevant research literature published from 2003 till 26^th Dec 2022. After applying the inclusion criteria articles pertinent to the topic were manually selected. Data was saved as CSV. Data was read using VOSviewer software and further analysis was performed using Microsoft excel.

RESULTS

From a total of 545 articles, 117 scientific papers relevant to the field were evaluated. The keen interest of researchers was identified by an increase in the number of publications over the course of time, with the highest citations n=827 attained during the year 2009. Brazil, India, and USA made significant contribution by publishing highest number of papers. Organizations from the USA produced the highest publications which attained high citations. Author Sculean A. published the highest number of papers. Journal of periodontology was the leading journal, by publishing highest number of papers (n=15), followed by Journal of Clinical Periodontology.

CONCLUSION

This bibliometric analysis provided detailed information regarding the total number of publications from 2003 to 2022 and the number of citations attained. Brazil has been identified as the leading country, whilst all the leading organizations which contributed significantly, were from USA. The Journal of Periodontology published the highest number of papers which had been highly cited. Sculean A, affiliated with University of Bern, Switzerland published the highest number of papers.

Association Between Salivary Cytokines, Chemokines and Growth Factors and Salivary Gland Function in Children with Chronic Kidney Disease

Introduction

Chronic kidney disease (CKD) is a systemic inflammatory disease that leads to multiple organ complications not only in the kidneys and the cardiovascular system, but also in the oral cavity. CKD children experience reduced saliva secretion (hyposalivation), which leads to increased incidence of dental caries and significant impairment of patients' quality of life. However, the causes of salivary gland dysfunction in children with CKD are unknown. The present study is the first to evaluate the inflammatory and anti-inflammatory profile in the saliva of children with CKD at different stages of renal failure with normal and reduced salivary gland function.

Methods

Thirty children with CKD (age 9-16) and thirty age- and gender-matched healthy children were classified for the study. Salivary inflammatory and anti-inflammatory profile were assayed using the multiplex ELISA assay.

Results

We demonstrated statistically significant changes in salivary pro-inflammatory (↑TNF-α, ↓IL-7), anti-inflammatory (↑IL-10), Th1 (↑INF-γ, ↑IL-15), Th2 (↑IL-4, ↑IL-5, ↑IL-6, ↑IL-9) and Th17 (IL-17) cytokines as well as chemokines (↑MCP-1/CCL-2, ↑MIP-1α/CCL3, ↓MIP-1β/CCL4, ↓EOTAXIN/CCL11) and growth factors (↑G-CSF, ↑FGF) in unstimulated saliva of children with CKD compared to the controls. Although the evaluation of the salivary inflammatory profile does not indicate a particular dominance of any of the branches of the immune system, we observed a statistically significant increase in the concentration of all Th2 cytokines assayed. The multivariate regression analysis showed that the content of salivary cytokines, chemokines and growth factors depends on the secretory function of the salivary glands, ie, salivary flow, total protein concentration and amylase activity in the saliva. Salivary MIP-1α/CCL3 was the most effective to differentiate children with CKD and hyposalivation from patients with normal saliva secretion.

Discussion

Inflammation is involved in salivary gland dysfunction in children with CKD, although further studies on in vitro and in vivo models are necessary to confirm this hypothesis.