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https://www.readbyqxmd.com/read/28641301/fluoride-in-dental-biofilm-varies-across-intra-oral-regions
#1
Line Staun Larsen, Vibeke Baelum, Livia Maria Andaló Tenuta, Alan Richards, Bente Nyvad
Information on differences in biofilm fluoride concentration across intra-oral regions may help explain the distribution of caries within the dentition. The aim of this cross-sectional study was to describe the fluoride concentration in saliva and in biofilm fluid and biofilm solids across 6 intra-oral regions. Unstimulated whole saliva was collected from 42 participants and biofilm harvested from the buccal sites in the 4 molar and 2 anterior regions. Samples were collected at least 1 h after use of fluoride dentifrice...
June 23, 2017: Caries Research
https://www.readbyqxmd.com/read/28634238/electron-transport-chain-is-biochemically-linked-to-pilus-assembly-required-for-polymicrobial-interactions-and-biofilm-formation-in-the-gram-positive-actinobacterium-actinomyces-oris
#2
Belkys C Sanchez, Chungyu Chang, Chenggang Wu, Bryan Tran, Hung Ton-That
The Gram-positive actinobacteria Actinomyces spp. are key colonizers in the development of oral biofilms due to the inherent ability of Actinomyces to adhere to receptor polysaccharides on the surface of oral streptococci and host cells. This receptor-dependent bacterial interaction, or coaggregation, requires a unique sortase-catalyzed pilus consisting of the pilus shaft FimA and the coaggregation factor CafA forming the pilus tip. While the essential role of the sortase machine SrtC2 in pilus assembly, biofilm formation, and coaggregation has been established, little is known about trans-acting factors contributing to these processes...
June 20, 2017: MBio
https://www.readbyqxmd.com/read/28629318/the-effect-of-a-daily-application-of-a-0-05-chlorhexidine-oral-rinse-solution-on-the-incidence-of-aspiration-pneumonia-in-nursing-home-residents-a-multicenter-study
#3
Vanessa R Y Hollaar, Gert-Jan van der Putten, Claar D van der Maarel-Wierink, Ewald M Bronkhorst, Bert J M de Swart, Nico H J Creugers
BACKGROUND: Dysphagia and potential respiratory pathogens in the oral biofilm are risk factors for aspiration pneumonia in nursing home residents. The aim of the study was to examine if the daily application of 0.05% chlorhexidine oral rinse solution is effective in reducing the incidence of aspiration pneumonia in nursing home residents with dysphagia. Associations between background variables (age, gender, dysphagia severity, care dependency, medication use, number of medical diagnoses, teeth and dental implants, and wearing removable dentures) and the incidence of aspiration pneumonia were also examined...
June 19, 2017: BMC Geriatrics
https://www.readbyqxmd.com/read/28625857/validation-of-the-visible-occlusal-plaque-index-vopi-in-estimating-caries-lesion-activity
#4
J C Carvalho, H D Mestrinho, L S Oliveira, M M Varjão, N Aimée, V Qvist
OBJECTIVE: The present study appraises the construct validity of the Visible Occlusal Plaque Index (VOPI) along with its sub-types, convergent and discriminant validity. METHODS: 618 10-15year old Brazilian adolescents were included. The VOPI has a four-point ordinal scale ranging from no plaque to heavy plaque. VOPI scores and caries status on permanent molars were mapped and recorded at individual anatomical sites of the groove-fossa-system and at surface level...
June 15, 2017: Journal of Dentistry
https://www.readbyqxmd.com/read/28622460/antifungal-activity-of-tyrosol-and-farnesol-used-in-combination-against-candida-species-in-the-planktonic-state-or-forming-biofilms
#5
Douglas Roberto Monteiro, Laís Salomão Arias, Renan Aparecido Fernandes, Lucas Fernando Deszo da Silva, Manoel Olavo Valentim Fernandes de Castilho, Thaís Oliveira da Rosa, Ana Paula Miranda Vieira, Fabiana Gouveia Straioto, Débora Barros Barbosa, Alberto Carlos Botazzo Delbem
AIM: This study examined the antifungal activity of the combination of tyrosol and farnesol against Candida albicans and Candida glabrata in the planktonic state or forming biofilms. METHODS AND RESULTS: The effect of drug association against Candida planktonic cells was assessed by the fractional inhibitory concentration index. Mono and dual-species biofilms were developed (24 h) and the compounds, applied during 3 days, with 2 daily treatments of 1 minute each...
June 16, 2017: Journal of Applied Microbiology
https://www.readbyqxmd.com/read/28617874/candida-albicans-mannans-mediate-streptococcus-mutans-exoenzyme-gtfb-binding-to-modulate-cross-kingdom-biofilm-development-in-vivo
#6
Geelsu Hwang, Yuan Liu, Dongyeop Kim, Yong Li, Damian J Krysan, Hyun Koo
Candida albicans is frequently detected with heavy infection by Streptococcus mutans in plaque-biofilms from children with early-childhood caries (ECC). This cross-kingdom biofilm contains an extensive matrix of extracellular α-glucans that is produced by an exoenzyme (GtfB) secreted by S. mutans. Here, we report that mannans located on the outer surface of C. albicans cell-wall mediates GtfB binding, enhancing glucan-matrix production and modulating bacterial-fungal association within biofilms formed in vivo...
June 2017: PLoS Pathogens
https://www.readbyqxmd.com/read/28613833/pt-decorated-mwcnts-ionic-liquid-composite-based-hydrogen-peroxide-sensor-to-study-microbial-metabolism-using-scanning-electrochemical-microscopy
#7
Vrushali Subhash Joshi, Jens Kreth, Dipankar Koley
Hydrogen peroxide (H2O2) is a highly relevant metabolite in many biological processes, including oral microbiome. To study this metabolite, we developed a 25 μm diameter, highly sensitive, non-enzymatic H2O2 sensor with a detection limit of 250 nM and a broad linear range of 250 nM to 7 mM. The sensor used the synergistic activity of the catalytically active Pt nanoparticles on a high surface area multiwall carbon nanotube and conducting ionic liquid matrix to achieve high sensitivity (2.4 ± 0.24 mA cm(-2) mM(-1)) for H2O2 oxidation...
June 14, 2017: Analytical Chemistry
https://www.readbyqxmd.com/read/28612506/synergistic-interactions-between-corrosion-and-wear-at-titanium-based-dental-implant-connections-a-scoping-review
#8
REVIEW
K Apaza-Bedoya, M Tarce, C A M Benfatti, B Henriques, M T Mathew, W Teughels, J C M Souza
Two-piece implant systems are mainly used in oral implantology involving an osseointegrated implant connected to an abutment, which supports prosthetic structures. It is well documented that the presence of microgaps, biofilms and oral fluids at the implant-abutment connection can cause mechanical and biological complications. The aim of this review paper was to report the degradation at the implant-abutment connection by wear and corrosion processes taking place in the oral cavity. Most of the retrieved studies evaluated the wear and corrosion (tribocorrosion) of titanium-based materials used for implants and abutments in artificial saliva...
June 14, 2017: Journal of Periodontal Research
https://www.readbyqxmd.com/read/28605597/bacterial-gtfb-augments-candida-albicans-accumulation-in-cross-kingdom-biofilms
#9
K Ellepola, Y Liu, T Cao, H Koo, C J Seneviratne
Streptococcus mutans is a biofilm-forming oral pathogen commonly associated with dental caries. Clinical studies have shown that S. mutans is often detected with Candida albicans in early childhood caries. Although the C. albicans presence has been shown to enhance bacterial accumulation in biofilms, the influence of S. mutans on fungal biology in this mixed-species relationship remains largely uncharacterized. Therefore, we aimed to investigate how the presence of S. mutans influences C. albicans biofilm development and coexistence...
June 1, 2017: Journal of Dental Research
https://www.readbyqxmd.com/read/28604268/mucosal-immunization-with-a-flagellin-adjuvanted-hgp44-vaccine-enhances-protective-immune-responses-in-a-murine-porphyromonas-gingivalis-infection-model
#10
Sao Puth, Seol Hee Hong, Mi Jin Park, Hye Hwa Lee, Youn Suhk Lee, Kwangjoon Jeong, In-Chol Kang, Jeong Tae Koh, Byounggon Moon, Sang Chul Park, Joon Haeng Rhee, Shee Eun Lee
Chronic periodontitis is caused by interactions between the oral polymicrobial community and host factors. Periodontal diseases are associated with dysbiotic shift in oral microbiota. Vaccination against periodontopathic bacteria could be a fundamental therapeutic to modulate polymicrobial biofilms. Because oral cavity is the site of periodontopathic bacterial colonization, mucosal vaccines should provide better protection than vaccines administered systemically. We previously reported that bacterial flagellin is an excellent mucosal adjuvant...
June 12, 2017: Human Vaccines & Immunotherapeutics
https://www.readbyqxmd.com/read/28603127/antibacterial-activities-of-diospyros-blancoi-phoenix-dactylifera-and-morus-nigra-against-dental-caries-causing-pathogens-an-in-vitro-study
#11
Lubna Tahir, Ayesha Aslam, Safia Ahmed
The study was undertaken to determine the in-vitro antibacterial potential of Diospyrosblancoi, Phoenix dactylifera and Morusnigra leaf extracts in hexane, chloroform, methanol, ethyl-acetate and aqueous extracts against dental caries causing bacteria. Disc diffusion assay was used to determine the antibacterial efficacy; the extracts were further separated using Thin Layer Chromatography and the anti-biofilm activity of the extracts was also determined. The preliminary phytochemical screening of the extracts revealed the presences of flavonoids, saponins, alkaloids and tannins because of which the extracts showed strong antibacterial activity against the selected pathogens...
January 2017: Pakistan Journal of Pharmaceutical Sciences
https://www.readbyqxmd.com/read/28598348/mortality-from-selected-diseases-that-can-be-transmitted-by-water-united-states-2003-2009
#12
J W Gargano, E A Adam, S A Collier, K E Fullerton, S J Feinman, M J Beach
Diseases spread by water are caused by fecal-oral, contact, inhalation, or other routes, resulting in illnesses affecting multiple body systems. We selected 13 pathogens or syndromes implicated in waterborne disease outbreaks or other well-documented waterborne transmission (acute otitis externa, Campylobacter, Cryptosporidium, Escherichia coli (E. coli), free-living ameba, Giardia, Hepatitis A virus, Legionella (Legionnaires' disease), nontuberculous mycobacteria (NTM), Pseudomonas-related pneumonia or septicemia, Salmonella, Shigella, and Vibrio)...
June 2017: Journal of Water and Health
https://www.readbyqxmd.com/read/28594320/silver-containing-foam-dressings-with-safetac-a-review-of-the-scientific-and-clinical-data
#13
Phil Davies, Sara McCarty, Kristina Hamberg
Background Topical antimicrobials, such as silver dressings, are progressively being used alongside systemic antibiotics to provide adjunctive, antimicrobial therapy to wounds that are clinically infected or at risk of infection. To help improve wound management, dressings that use Safetac soft silicone technology in combination with a silver-impregnated foam dressing material were developed by Mölnlycke Health Care (Gothenburg, Sweden). The range comprises Mepilex Ag, Mepilex Border Ag and Mepilex Transfer Ag...
June 1, 2017: Journal of Wound Care
https://www.readbyqxmd.com/read/28591237/association-between-pathogens-from-tracheal-aspirate-and-oral-biofilm-of-patients-on-mechanical-ventilation
#14
Luana Carneiro Diniz Souza, Vanise Barros Rodrigues da Mota, Alícia Valéria Dos Santos Zaranza de Carvalho, Rita da Graça Carvalhal Frazão Corrêa, Silvana Amado Libério, Fernanda Ferreira Lopes
The aim of this study was to detect possible associations between respiratory pathogens from tracheal aspirate and oral biofilm samples in intubated patients in an intensive care unit (ICU), and to identify the most common respiratory pathogens in oral biofilm, particularly in patients that developed ventilator-associated pneumonia (VAP). Two oral biofilm samples were collected from the tongue of intubated patients (at admission and after 48 hours) and analyzed by culture with the Antibiotic Sensitivity Test...
June 5, 2017: Brazilian Oral Research
https://www.readbyqxmd.com/read/28589230/the-immune-response-in-periodontal-tissues
#15
REVIEW
Małgorzata Nędzi-Góra, Jan Kowalski, Renata Górska
The uniqueness of periodontal diseases is caused by several factors. This group of diseases is caused by numerous bacterial species formed in the dental biofilm, and one cannot distinguish the specific pathogen that is responsible for the disease initiation or progress (though Gram-negative anaerobic rods are associated with the advanced form of the disease). The disease is both infectious and inflammatory in its nature, and in the state of health there is always a subclinical level of inflammatory response, caused by the so-called harmless bacteria...
June 6, 2017: Archivum Immunologiae et Therapiae Experimentalis
https://www.readbyqxmd.com/read/28587978/a-new-arginine-based-dental-adhesive-system-formulation-mechanical-and-anti-caries-properties
#16
Saulo Geraldeli, Eveline F Soares, Andres J Alvarez, Tanaz Farivar, Robert C Shields, Mario A C Sinhoreti, Marcelle M Nascimento
Secondary caries at the margins of composite restorations has been attributed to adhesive failure and consequent accumulation of cariogenic biofilms. OBJECTIVES: to develop and evaluate an etch-and-rinse adhesive system containing arginine for sustainable release and recharge without affecting its mechanical properties. Arginine metabolism by oral bacteria generates ammonia, which neutralizes glycolytic acids and creates a neutral environmental pH that is less favorable to the growth of caries pathogens, thus reducing the caries risk at the tooth-composite interface...
June 3, 2017: Journal of Dentistry
https://www.readbyqxmd.com/read/28586050/inhibitory-capacity-of-rhus-coriaria-l-extract-and-its-major-component-methyl-gallate-on-streptococcus-mutans-biofilm-formation-by-optical-profilometry-potential-applications-for-oral-health
#17
Tomas Kacergius, Saleh Abu-Lafi, Agne Kirkliauskiene, Vika Gabe, Azmi Adawi, Mahmoud Rayan, Mutaz Qutob, Rimantas Stukas, Algirdas Utkus, Mouhammad Zeidan, Anwar Rayan
Streptococcus mutans (S. mutans) bacterium is the most well recognized pathogen involved in pathogenesis of dental caries. Its virulence arises from its ability to produce a biofilm and acidogenicity, causing tooth decay. Discovery of natural products capable to inhibit biofilm formation is of high importance for developing health care products. To the best of our knowledge, in all previous scientific reports, a colorimetric assay was applied to test the effect of sumac and methyl gallate (MG) on S. mutans adherence...
July 2017: Molecular Medicine Reports
https://www.readbyqxmd.com/read/28579399/prevention-of-icaa-regulated-poly-n-acetyl-glucosamine-formation-in-staphylococcus-aureus-biofilm-through-new-drug-like-inhibitors-in-silico-approach-and-md-simulation-study
#18
Ayushi Gupta, Swechha Mishra, Sangeeta Singh, Sonali Mishra
OBJECTIVES: The effectiveness of various ligands against the protein structure of IcaA of the IcaABCD gene locus of Staphylococcus aureus were examined using the approach of structure based drug designing in reference with the protein's efficiency to form biofilms. RESULTS: Four compounds CID42738592, CID90468752, CID24277882, and CID6435208 were secluded from a database of 31,242 inhibitory ligands on the justification of the evaluated values falling under the four - tier structure based virtual screening...
June 1, 2017: Microbial Pathogenesis
https://www.readbyqxmd.com/read/28577425/denaturing-gradient-gel-electrophoresis-profiles-of-bacteria-from-the-saliva-of-twenty-four-different-individuals-form-clusters-that-showed-no-relationship-to-the-yeasts-present
#19
Manjula M Weerasekera, Chris H Sissons, Lisa Wong, Sally A Anderson, Ann R Holmes, Richard D Cannon
OBJECTIVES: The aim was to investigate the relationship between groups of bacteria identified by cluster analysis of the DGGE fingerprints and the amounts and diversity of yeast present. METHODS: Bacterial and yeast populations in saliva samples from 24 adults were analysed using denaturing gradient gel electrophoresis (DGGE) of the bacteria present and by yeast culture. RESULTS: Eubacterial DGGE banding patterns showed considerable variation between individuals...
May 22, 2017: Archives of Oral Biology
https://www.readbyqxmd.com/read/28572307/complete-genome-sequence-of-veillonella-atypica-ok5-the-first-transformable-strain-in-the-species
#20
Peng Zhou, Gary Xie, Xiaoli Li, Jinman Liu, Fengxia Qi
The Veillonella atypica strain OK5 was isolated from a human saliva sample and was the first strain shown to be genetically transformable in the Veillonella genus. Genetic studies using this strain have helped us gain much insight into the ecology of human oral biofilms. Here, we report the complete genome sequence of V. atypica OK5.
June 1, 2017: Genome Announcements
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