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Influence of the oscillation frequency of different side-to-side toothbrushes on noncontact biofilm removal

ConclusionsThe oscillation frequency of the tested side-to-side toothbrushes affected the biofilm reduction in an interdental space model.Clinical relevanceWithin a toothbrush, higher oscillation frequencies may lead to beneficial effects on interdental biofilm removal by noncontact brushing.
Source: Dental Technology Blog - Category: Dentistry Source Type: news

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Summary Bacteria residing in oral biofilms live in a state of dynamic equilibrium with one another. The intricate synergistic or antagonistic interactions between them are crucial for determining this balance. Using the six‐species Zürich “supragingival” biofilm model, this study aimed to investigate interactions regarding growth and localization of the constituent species. As control, an inoculum containing all six strains was used, whereas in each of the further five inocula one of the bacterial species was alternately absent, and in the last, both streptococci were absent. Biofilms were grown anaerobi...
Source: Oral Microbiology and Immunology - Category: Microbiology Authors: Tags: ORIGINAL ARTICLE Source Type: research
Hydrogen sulfide (H2S) plays important roles in the pathogenesis of periodontitis. Oral pathogens typically produce H2S from l-cysteine in addition to pyruvate and NH4+. However, fn1055 from Fusobacterium nucleatum subsp. nucleatum ATCC 25586 encodes a pyridoxal 5'-phosphate (PLP)-dependent enzyme that catalyzes the production of H2S and l-serine from l-cysteine and H2O, an unusual cysteine (hydroxyl) lyase reaction (β-replacement reaction). To reveal the reaction mechanism, the crystal structure of substrate-free Fn1055 was determined. Based on this structure, a model of the l-cysteine-PLP Schiff base suggested that ...
Source: Biochemical Journal - Category: Biochemistry Authors: Tags: Research Articles Source Type: research
This study leads to elucidation of the H2S-producing mechanism in F. nucleatum. PMID: 29343611 [PubMed - as supplied by publisher]
Source: The Biochemical Journal - Category: Biochemistry Authors: Tags: Biochem J Source Type: research
Authors: Mesrar H, Mesrar J, Maillier B, Kraoua S, Chapoutot L, Delclaux B Abstract Lemierre's syndrome is a rare and severe sepsis that can rapidly lead to a life-threatening condition in the absence of early management. This syndrome described at the beginning of the 20th century combines oropharyngeal infection complicated with septic thrombosis of the internal jugular vein and septic emboli predominantly pulmonary. Fusobacterium necrophorum, anaerobic germ, Gram negative bacillus is the main germ in this "necrobacillosis". The diagnosis is should be confirmed precociously with cervicothoracic CT-scan,...
Source: Revue de Medecine Interne - Category: Internal Medicine Tags: Rev Med Interne Source Type: research
Aim: to establish the variability and origin of the composition of oropharyngeal microbiota in patients with different clinical and functional characteristics of COPD.Methods: included g64 COPD patients without exacerbations for 4 weeks. At the visit were performed the collection of anamnestic data, lung function evaluation, body plethysmography, lung diffusion capacity study, CT scan of the chest and collection of oropharingeal swabs to identify the composition of the microbiota by sequencing 16S rRNA gene sequences of bacteria. To determine the pattern of respiratory microbiota associated with specific phenotypic charact...
Source: European Respiratory Journal - Category: Respiratory Medicine Authors: Tags: Clinical Problems COPD Source Type: research
In conclusion, the study indicated that the oils of O. stamineus and F. deltoidea possessed moderate to strong antibacterial properties against the seven strains pathogenic oral bacteria and may have caused disturbances of membrane structure or cell wall of the bacteria.
Source: Molecules - Category: Chemistry Authors: Tags: Article Source Type: research
ConclusionOur findings suggest that sucrose‐independent biofilm may have cariogenicity as with sucrose‐dependent biofilm. These in vitro models can help further elucidate plaque‐induced caries aetiology and develop new anticaries agents.This article is protected by copyright. All rights reserved.
Source: Oral Diseases - Category: ENT & OMF Authors: Tags: Original Article Source Type: research
CONCLUSIONS: When used to reproduce periodontal biofilms composed of F. nucleatum and P. gingivalis, the dynamic method (CDC biofilm reactor) formed looser biofilms containing fewer bacteria than the well plate. However, this difference did not influence the thickness of the biofilms or the activity of chlorhexidine. Therefore, both methods are useful for mimicking periodontitis-associated oral biofilms. PMID: 28861286 [PubMed]
Source: Journal of Periodontal and Implant Science - Category: Dentistry Authors: Tags: J Periodontal Implant Sci Source Type: research
Conclusions S. mutans can increase the surface roughness of composites, depending on their composition. This ability of S. mutans is, however, mitigated in co-culture with other species. In particular, bacterial esterases seem to be responsible for the increased composite surface roughness upon biofilms exposure. Clinical significance Cariogenic bacteria can degrade composites, thereby increasing the surface roughness. Increased roughness and subsequent improved bacterial accumulation may facilitate the development of secondary caries around composites, which is the most common reason for the restoration failure.
Source: Journal of Dentistry - Category: Dentistry Source Type: research
ConclusionsA three-species in vitro biofilm could be altered by noncontact brushing with toothbrushes A, B, and C in an artificial interdental space model.Clinical relevanceCertain side-to-side toothbrushes demonstrate in vitro a high efficacy in interdental biofilm removal without bristle-to-biofilm contact.
Source: Clinical Oral Investigations - Category: Dentistry Source Type: research
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