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Related Concept Videos

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Biofilms

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Biofilms are complex communities of microorganisms encased in a self-produced extracellular polysaccharide matrix attached to surfaces. These microbial consortia can include single or multiple species, providing enhanced survival benefits by forming organized, multilayered structures.The formation of biofilms occurs through four key stages: attachment, colonization, development, and dispersal.During attachment, free-swimming planktonic cells adhere to a surface, often facilitated by...
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Surface Appendages of Archaea01:23

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Archaeal surface appendages are highly specialized structures essential for environmental adaptation, encompassing roles in adhesion, biofilm formation, and motility. Among these appendages, pili and archaella stand out for their distinct morphologies and functionalities, enabling archaea to thrive in diverse and often extreme environments.Pili: Adhesion and Biofilm FormationPili are filamentous structures assembled from pilin protein subunits, primarily contributing to adhesion and biofilm...
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Oral Biofilm Formation on Different Materials for Dental Implants
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Root Surface Biofilms and Caries.

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    Root caries form when exposed tooth roots develop biofilms. These biofilms, influenced by saliva and gingival fluid, contain diverse bacteria that degrade tooth structure.

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    Area of Science:

    • Oral microbiology
    • Dental research
    • Cariology

    Background:

    • Gingival recession exposes root surfaces, increasing susceptibility to microbial colonization and biofilm formation.
    • Saliva and gingival crevicular fluid influence biofilm development by providing nutrients and forming the acquired root surface pellicle.
    • Root surfaces are more vulnerable to demineralization than enamel due to lower mineral and higher organic content.

    Purpose of the Study:

    • To characterize the microbial etiology of root caries.
    • To understand the ecological factors driving microbial shifts in root surface lesions.
    • To investigate the roles of different bacterial species in the degradation of dental tissues.

    Main Methods:

    • Review of traditional culture-based and modern molecular-based studies on root surface microbiota.
    • Application of ecological concepts to explain microbial succession and virulence in root caries.
    • Analysis of bacterial metabolism and interactions in the context of demineralization and dentin degradation.

    Main Results:

    • Early root surface colonizers are primarily Gram-positive bacteria, similar to enamel microbiota.
    • Molecular studies reveal a more complex microbiota than previously thought, including Gram-negative and anaerobic species.
    • Ecological shifts favor saccharolytic bacteria in acidic conditions, followed by proteolytic bacteria when dentin is exposed.

    Conclusions:

    • Root caries development involves a complex interplay of microbial communities and environmental factors.
    • Understanding the microbial ecology of root surfaces is crucial for developing effective prevention and treatment strategies.
    • Both inorganic and organic components of dental tissues are degraded by the concerted action of these bacteria.