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Journal of Dental Research Jul 2019The oral cavity contains a rich consortium of exopolysaccharide-producing microbes. These extracellular polysaccharides comprise a major component of the oral biofilm.... (Review)
Review
The oral cavity contains a rich consortium of exopolysaccharide-producing microbes. These extracellular polysaccharides comprise a major component of the oral biofilm. Together with extracellular proteins, DNA, and lipids, they form the biofilm matrix, which contributes to bacterial colonization, biofilm formation and maintenance, and pathogenesis. While a number of oral microbes have been studied in detail with regard to biofilm formation and pathogenesis, the exopolysaccharides have been well characterized for only select organisms, namely and . Studies on the exopolysaccharides of other oral organisms, however, are in their infancy. In this review, we present the current research on exopolysaccharides of oral microbes regarding their biosynthesis, regulation, contributions to biofilm formation and stability of the matrix, and immune evasion. In addition, insight into the role of exopolysaccharides in biofilms is highlighted through the evaluation of emerging techniques such as pH probing of biofilm colonies, solid-state nuclear magnetic resonance for macromolecular interactions within biofilms, and super-resolution microscopy analysis of biofilm development. Finally, exopolysaccharide as a potential nutrient source for species within a biofilm is discussed.
Topics: Aggregatibacter actinomycetemcomitans; Biofilms; Humans; Mouth; Polysaccharides, Bacterial; Streptococcus mutans
PubMed: 31009580
DOI: 10.1177/0022034519845001 -
Medicine Dec 2021SARS-CoV-2 is the virus responsible for coronavirus disease-19 (COVID-19) disease, which has been shown to trigger multiple affectations. One of the first tissue areas...
BACKGROUND
SARS-CoV-2 is the virus responsible for coronavirus disease-19 (COVID-19) disease, which has been shown to trigger multiple affectations. One of the first tissue areas to come into contact with the virus is the oral cavity, which develops various alterations. Hence, the objective of this systematic review was to identify the main signs and symptoms of this disease in the oral cavity, and the following research question was established: What are the main oral signs and symptoms in COVID-19-positive persons?
METHODS
The electronic databases of PUBMED, SCOPUS, and SCIENCE DIRECT were analyzed, the keywords "ORAL DISEASES," "ORAL MANIFESTACTIONS," and "COVID-19" were used taking into account the following inclusion criteria: studies whose main objective was oral manifestations secondary to the confirmation of COVID-19, plus clinical cases, case series, and retrospective or prospective studies. For the assessment of the risk of bias the JBI Critical Appraisal Checklist for Case Series tool was used.
RESULTS
A total of 18 studies were included, the most common initial signs/symptoms after contagion of SARS-CoV-2 were dysgeusia, dry mouth, and burning mouth, and the main signs/symptoms were the presence of ulcerative lesions, dysgeusia, and Candida albicans infections.
CONCLUSIONS
It is very important to detect any alteration in the mucosa in patients with COVID-19 and to provide assertive treatment to avoid complications, and try to maintain adequate oral hygiene throughout the course of the disease to avoid the colonization of opportunistic microorganisms and to avoid complications both orally and systemically.
Topics: COVID-19; Candidiasis, Oral; Dysgeusia; Humans; Mouth; Mouth Diseases; Prospective Studies; Retrospective Studies
PubMed: 34941133
DOI: 10.1097/MD.0000000000028327 -
Clinical Oral Investigations Dec 2020All soft and solid surface structures in the oral cavity are covered by the acquired pellicle followed by bacterial colonization. This applies for natural structures as... (Review)
Review
BACKGROUND
All soft and solid surface structures in the oral cavity are covered by the acquired pellicle followed by bacterial colonization. This applies for natural structures as well as for restorative or prosthetic materials; the adherent bacterial biofilm is associated among others with the development of caries, periodontal diseases, peri-implantitis, or denture-associated stomatitis. Accordingly, there is a considerable demand for novel materials and coatings that limit and modulate bacterial attachment and/or propagation of microorganisms.
OBJECTIVES AND FINDINGS
The present paper depicts the current knowledge on the impact of different physicochemical surface characteristics on bioadsorption in the oral cavity. Furthermore, it was carved out which strategies were developed in dental research and general surface science to inhibit bacterial colonization and to delay biofilm formation by low-fouling or "easy-to-clean" surfaces. These include the modulation of physicochemical properties such as periodic topographies, roughness, surface free energy, or hardness. In recent years, a large emphasis was laid on micro- and nanostructured surfaces and on liquid repellent superhydrophic as well as superhydrophilic interfaces. Materials incorporating mobile or bound nanoparticles promoting bacteriostatic or bacteriotoxic properties were also used. Recently, chemically textured interfaces gained increasing interest and could represent promising solutions for innovative antibioadhesion interfaces. Due to the unique conditions in the oral cavity, mainly in vivo or in situ studies were considered in the review.
CONCLUSION
Despite many promising approaches for modulation of biofilm formation in the oral cavity, the ubiquitous phenomenon of bioadsorption and adhesion pellicle formation in the challenging oral milieu masks surface properties and therewith hampers low-fouling strategies.
CLINICAL RELEVANCE
Improved dental materials and surface coatings with easy-to-clean properties have the potential to improve oral health, but extensive and systematic research is required in this field to develop biocompatible and effective substances.
Topics: Bacterial Adhesion; Biofilms; Dental Pellicle; Mouth; Surface Properties
PubMed: 33111157
DOI: 10.1007/s00784-020-03646-1 -
Canadian Journal of Microbiology Jun 2017Many studies show that the human microbiome plays a critical role in the chronic pathologies of obesity, inflammatory bowel diseases, and diabetes. More recently, the... (Review)
Review
Many studies show that the human microbiome plays a critical role in the chronic pathologies of obesity, inflammatory bowel diseases, and diabetes. More recently, the interaction between cancer and the microbiome has been highlighted. Most studies have focused on the gut microbiota because it represents the most extensive bacterial community, and the body of evidence correlating it with gut syndromes is increasing. However, in the strict sense, the gastrointestinal (GI) tract begins in the oral cavity, and special attention should be paid to the specific flora of this cavity. This study reviewed the current knowledge about the various microbial ecosystems of the upper part of the GI tract and discussed their potential link to carcinogenesis. The overall composition of the microbial communities, as well as the presence or absence of "key species", in relation to carcinogenesis is addressed. Alterations in the oral microbiota can potentially be used to predict the risk of cancer. Molecular advances and the further monitoring of the microbiota will increase our understanding of the role of the microbiota in carcinogenesis and open new perspectives for future therapeutic and prophylactic modalities.
Topics: Digestive System Neoplasms; Gastrointestinal Microbiome; Humans; Microbiota; Mouth; Mouth Diseases
PubMed: 28257583
DOI: 10.1139/cjm-2016-0603 -
International Journal of Molecular... Jan 2022This review article was designed to evaluate the existing evidence related to the molecular processes of SARS-CoV-2 infection in the oral cavity. The World Health... (Review)
Review
This review article was designed to evaluate the existing evidence related to the molecular processes of SARS-CoV-2 infection in the oral cavity. The World Health Organization stated that severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) infection and transmission is produced by respiratory droplets and aerosols from the oral cavity of infected patients. The oral cavity structures, keratinized and non-keratinized mucosa, and salivary glands' epithelia express SARS-CoV-2 entry and transmission factors, especially angiotensin converting enzyme Type 2 (ACE2) and transmembrane serine protease 2 (TMPRSS2). Replication of the virus in cells leads to local and systemic infection spread, and cellular damage is associated with clinical signs and symptoms of the disease in the oral cavity. Saliva, both the cellular and acellular fractions, holds the virus particles and contributes to COVID-19 transmission. The review also presents information about the factors modifying SARS-CoV-2 infection potential and possible local pharmacotherapeutic interventions, which may confine SARS-CoV-2 virus entry and transmission in the oral cavity. The PubMed and Scopus databases were used to search for suitable keywords such as: SARS-CoV-2, COVID-19, oral virus infection, saliva, crevicular fluid, salivary gland, tongue, oral mucosa, periodontium, gingiva, dental pulp, ACE2, TMPRSS2, Furin, diagnosis, topical treatment, vaccine and related words in relevant publications up to 28 December 2021. Data extraction and quality evaluation of the articles were performed by two reviewers, and 63 articles were included in the final review.
Topics: Angiotensin-Converting Enzyme 2; Animals; COVID-19; Humans; Mouth; Mouth Mucosa; Pathology, Oral; Receptors, Virus; SARS-CoV-2; Serine Endopeptidases; Signal Transduction; Virus Internalization
PubMed: 35163355
DOI: 10.3390/ijms23031431 -
Dental and Medical Problems 2018The role of the oral cavity as a reservoir for Helicobacter pylori is still a controversial issue. There is a great number of articles indicating the presence of this... (Review)
Review
The role of the oral cavity as a reservoir for Helicobacter pylori is still a controversial issue. There is a great number of articles indicating the presence of this pathogen in the oral cavity, but discrepancies among techniques for H. pylori detection and the variations in the patients tested often make it difficult to formulate a final verdict. Outer membrane proteins (OMPs) are one of the most important factors determining colonization of H. pylori in the oral cavity. Among them, the key role is attributed to BabA, SabA and NapA, all of which promote adherence and retention within this area. The oral cavity is characterized by the co-existence of numerous microorganisms which may potentially affect the physiology and morphology of H. pylori. The presence of coccoid-stimulating factors and relatively low levels of AI-2 in the earlyto mid-stages of supragingival plaque allow dental H. pylori to colonize this niche as nonculturable spherical forms. On the other hand, subgingival plaque characterized by high numbers of periopathogens, capable of synthesizing high concentrations of AI-2, may favor the presence of mixed populations of spiral and coccoid H. pylori forms. This review article provides an up-to-date knowledge about the ability of oral H. pylori to interact both with the host and the local microflora of the oral cavity.
Topics: Biofilms; Dental Plaque; Helicobacter Infections; Helicobacter pylori; Humans; Mouth; Stomach
PubMed: 30152639
DOI: 10.17219/dmp/81259 -
Frontiers in Immunology 2020The composition of the oral milieu reflects oral health. Saliva provides an environment for multiple microorganisms, and contains soluble factors and immune cells.... (Review)
Review
The composition of the oral milieu reflects oral health. Saliva provides an environment for multiple microorganisms, and contains soluble factors and immune cells. Neutrophils, which rapidly react on the changes in the microenvironment, are a major immune cell population in saliva and thus may serve as a biomarker for oral pathologies. This review focuses on salivary neutrophils in the oral cavity, their phenotype changes in physiological and pathological conditions, as well as on factors regulating oral neutrophil amount, activation and functionality, with special emphasis on oral cancer and its risk factors.
Topics: Humans; Mouth; Mouth Neoplasms; Neutrophils; Saliva
PubMed: 33162980
DOI: 10.3389/fimmu.2020.565683 -
Head and Neck Pathology Jun 2022Frozen section evaluation of head and neck squamous cell carcinoma (SCC) is critical for margin status and subsequent patient therapy. In this study, we retrospectively... (Review)
Review
Frozen section evaluation of head and neck squamous cell carcinoma (SCC) is critical for margin status and subsequent patient therapy. In this study, we retrospectively reviewed the rate of frozen-permanent section discrepancies in blocks with two frozen section levels compared to ≥ three levels in oral cavity and oropharyngeal SCCs. A search of the cases with both intraoperative frozen sections and corresponding permanent sections for SCCs in the oral cavity and oropharynx was performed. Frozen sections and permanent slides were compared. The nature of discrepancies was assigned to one of the following: change in diagnosis, margin status, or distance of the tumor from the margin. The cause of the discrepancy was designated as one of the following: block sampling, gross sampling, interpretation, or technical error. The pathologist experience, frozen section technical experience, and intraoperative impact of each discrepancy were also evaluated. A total of 654 frozen and corresponding permanent blocks were assessed. For 532 of the frozen section blocks, two levels were cut, while 122 frozen section blocks had ≥ three levels. Thirty-five frozen-permanent section discrepancies were observed (5.4% of all blocks). Among these, 2.5% had a possible or definitive intraoperative impact. The percentage of discrepancies in the ≥ three levels group (5.7%) was slightly higher than the two-level group (5.3%), and this difference was not statistically significant. For the two-level group, the overall block sampling error rate was 4.5%. This was not significantly different from the 4.1% block sampling error rate seen in the ≥ three levels group. The rate of block sampling discrepancy did not show significant differences based on attending or frozen section technical experience. A change in margin distance (closer margin detected on permanent) occurred in 4% of the blocks and involved 16% of the patients. This review of oral cavity and oropharynx SCCs frozen/permanent section discrepancies shows that the error rate is not significantly different depending on the number of levels cut. The results suggest that always performing more than two frozen section levels may not yield a decreased discrepancy rate. A change in margin distance occurred quite frequently, but only in rare cases it had a definitive impact on the intraoperative management. Given the importance of correct intraoperative diagnosis in patient management, additional levels may be warranted depending on the clinical scenario.
Topics: Carcinoma, Squamous Cell; Head and Neck Neoplasms; Humans; Margins of Excision; Mouth; Retrospective Studies; Squamous Cell Carcinoma of Head and Neck
PubMed: 34655410
DOI: 10.1007/s12105-021-01385-7 -
Oxidative Medicine and Cellular... 2022Oral diseases are among the most common human diseases yet less studied. These diseases affect both the physical, mental, and social health of the patients resulting in... (Review)
Review
Oral diseases are among the most common human diseases yet less studied. These diseases affect both the physical, mental, and social health of the patients resulting in poor quality of life. They affect all ages, although severe stages are mostly observed in older individuals. Poor oral hygiene, genetics, and environmental factors contribute enormously to the development and progression of these diseases. Although there are available treatment options for these diseases, the recurrence of the diseases hinders their efficiency. Oral volatile sulfur compounds (VSCs) are highly produced in oral cavity as a result of bacteria activities. Together with bacteria components such as lipopolysaccharides, VSCs participate in the progression of oral diseases by regulating cellular activities and interfering with the immune response. Hydrogen sulfide (HS) is a gaseous neurotransmitter primarily produced endogenously and is involved in the regulation of cellular activities. The gas is also among the VSCs produced by oral bacteria. In numerous diseases, HS have been reported to have dual effects depending on the cell, concentration, and donor used. In oral diseases, high production and subsequent utilization of this gas have been reported. Also, this high production is associated with the progression of oral diseases. In this review, we will discuss the production of HS in oral cavity, its interaction with cellular activities, and most importantly its role in oral diseases.
Topics: Apoptosis; Bacteria; Cystathionine gamma-Lyase; Humans; Hydrogen Sulfide; Mouth; Mouth Diseases; Mouth Neoplasms; Oxidative Stress
PubMed: 35116090
DOI: 10.1155/2022/1886277 -
International Journal of Molecular... Nov 2023Pyogenic granuloma (PG) is a benign vascular lesion found predominantly in the oral cavity. Characterized by rapid growth and propensity to bleed, PG presents diagnostic... (Review)
Review
Pyogenic granuloma (PG) is a benign vascular lesion found predominantly in the oral cavity. Characterized by rapid growth and propensity to bleed, PG presents diagnostic challenges due to its similarity and alarming proliferation. This narrative review synthesizes current knowledge on the epidemiology, etiopathogenesis, clinical manifestations, and management of oral PG, with emphasis on recent advances in diagnostic and therapeutic approaches. The epidemiology of the injury is meticulously analyzed, revealing a higher incidence in women and a wide range of ages of onset. It delves into the etiopathogenesis, highlighting the uncertainty surrounding the exact causal factors, although historical attributions suggest an infectious origin. It exhaustively analyzes the clinical and histopathological aspects of oral PG, offering information on its various presentations and the importance of an accurate diagnosis to guide effective treatment. It details treatment strategies, emphasizing the personalized approach based on individual patient characteristics. This comprehensive review consolidates current knowledge on oral PG, highlighting the need for further research to clarify its pathogenesis and optimize treatment protocols.
Topics: Humans; Female; Granuloma, Pyogenic; Mouth Mucosa; Mouth
PubMed: 38069207
DOI: 10.3390/ijms242316885