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https://www.readbyqxmd.com/read/27926431/the-oral-microbiome-in-health-and-its-implication-in-oral-and-systemic-diseases
#1
B Sampaio-Maia, I M Caldas, M L Pereira, D Pérez-Mongiovi, R Araujo
The oral microbiome can alter the balance between health and disease, locally and systemically. Within the oral cavity, bacteria, archaea, fungi, protozoa, and viruses may all be found, each having a particular role, but strongly interacting with each other and with the host, in sickness or in health. A description on how colonization occurs and how the oral microbiome dynamically evolves throughout the host's life is given. In this chapter the authors also address oral and nonoral conditions in which oral microorganisms may play a role in the etiology and progression, presenting the up-to-date knowledge on oral dysbiosis as well as the known underlying pathophysiologic mechanisms involving oral microorganisms in each condition...
2016: Advances in Applied Microbiology
https://www.readbyqxmd.com/read/27924596/methods-to-study-antagonistic-activities-among-oral-bacteria
#2
Fengxia Qi, Jens Kreth
Most bacteria in nature exist in multispecies communities known as biofilms. In the natural habitat where resources (nutrient, space, etc.) are usually limited, individual species must compete or collaborate with other neighboring species in order to perpetuate in the multispecies community. The human oral cavity is colonized by >700 microbial species known as the indigenous microbiota. This indigenous flora normally maintains an ecological balance through antagonistic as well as mutualistic interspecies interactions...
2017: Methods in Molecular Biology
https://www.readbyqxmd.com/read/27919444/mechanistic-genomic-and-proteomic-study-on-the-effects-of-bisgma-derived-biodegradation-product-on-cariogenic-bacteria
#3
Lida Sadeghinejad, Dennis G Cvitkovitch, Walter L Siqueira, Justin Merritt, J Paul Santerre, Yoav Finer
OBJECTIVES: Investigate the effects of a Bis-phenyl-glycidyl-dimethacrylate (BisGMA) biodegradation product, bishydroxypropoxyphenyl-propane (BisHPPP), on gene expression and protein synthesis of cariogenic bacteria. METHODS: Quantitative real-time polymerase chain reaction was used to investigate the effects of BisHPPP on the expression of specific virulence-associated genes, i.e. gtfB, gtfC, gbpB, comC, comD, comE and atpH in Streptococcus mutans UA159. Possible mechanisms for bacterial response to BisHPPP were explored using gene knock-out and associated complemented strains of the signal peptide encoding gene, comC...
December 2, 2016: Dental Materials: Official Publication of the Academy of Dental Materials
https://www.readbyqxmd.com/read/27898021/salivary-microbiome-diversity-in-caries-free-and-caries-affected-children
#4
Shan Jiang, Xiaoli Gao, Lijian Jin, Edward C M Lo
Dental caries (tooth decay) is an infectious disease. Its etiology is not fully understood from the microbiological perspective. This study characterizes the diversity of microbial flora in the saliva of children with and without dental caries. Children (3-4 years old) with caries (n = 20) and without caries (n = 20) were recruited. Unstimulated saliva (2 mL) was collected from each child and the total microbial genomic DNA was extracted. DNA amplicons of the V3-V4 hypervariable region of the bacterial 16S rRNA gene were generated and subjected to Illumina Miseq sequencing...
November 25, 2016: International Journal of Molecular Sciences
https://www.readbyqxmd.com/read/27894112/association-of-mbl2-gene-polymorphism-with-dental-caries-in-saudi-children
#5
Yousef M Alyousef, J Francis Borgio, Sayed AbdulAzeez, Naif Al-Masoud, Ali A Al-Ali, Emad Al-Shwaimi, Amein K Al-Ali
The high prevalence of dental caries in children worldwide is a major oral health problem which requires early intervention. Dental caries is mainly caused by the action of acids produced by bacteria in addition to many other factors. Recent genetic studies have reported that a number of genes are associated with the susceptibility to dental caries. The majority of these genes are associated with inflammation, increased susceptibility to infection, and dentine matrix formation. Using the TaqMan assay and direct DNA sequencing, the prevalence of 6 single-nucleotide polymorphisms (SNPs) in MMP9, MBL2, MMP2, and TIMP2 genes was determined in 102 children with caries and in 100 age-matched caries-free controls...
November 29, 2016: Caries Research
https://www.readbyqxmd.com/read/27891311/comparison-of-antibacterial-efficacy-of-coconut-oil-and-chlorhexidine-on-streptococcus-mutans-an-in-vivo-study
#6
Faizal C Peedikayil, Vimal Remy, Seena John, T P Chandru, Prathima Sreenivasan, Gufran Ahmed Bijapur
AIMS: Streptococcus mutans is the most common organism causing dental caries. Various chemotherapeutic agents are available that help in treating the bacteria, with each having their own merits and demerits. Recent research has shown that coconut oil has anti-inflammatory and antimicrobial action. Therefore, the present was conducted to determine the antibacterial efficacy of coconut oil and to compare it with chlorhexidine. MATERIALS AND METHODS: A total of fifty female children aged 8-12 years were included in the study...
September 2016: Journal of International Society of Preventive & Community Dentistry
https://www.readbyqxmd.com/read/27890003/biofilm-mediated-antibiotic-resistant-oral-bacterial
#7
Indu Lata Kanwar, Abhishek Kumar Sah, Preeti K Suresh
Oral diseases like dental caries and periodontal disease are directly associated with the capability of bacteria to form biofilm. Periodontal diseases have been associated to anaerobic Gram-negative bacteria forming a subgingival plaque (Porphyromonas gingivalis, Actinobacillus, Prevotella and Fusobacterium). Biofilm is a complex bacterial community that is highly resistant to antibiotics and human immunity. Biofilm communities are the causative agents of biological developments such as dental caries, periodontitis, and peri-implantitis, and causing periodontal tissue breakdown...
November 24, 2016: Current Pharmaceutical Design
https://www.readbyqxmd.com/read/27857087/the-oral-microbiome-an-update-for-oral-healthcare-professionals
#8
M Kilian, I L C Chapple, M Hannig, P D Marsh, V Meuric, A M L Pedersen, M S Tonetti, W G Wade, E Zaura
For millions of years, our resident microbes have coevolved and coexisted with us in a mostly harmonious symbiotic relationship. We are not distinct entities from our microbiome, but together we form a 'superorganism' or holobiont, with the microbiome playing a significant role in our physiology and health. The mouth houses the second most diverse microbial community in the body, harbouring over 700 species of bacteria that colonise the hard surfaces of teeth and the soft tissues of the oral mucosa. Through recent advances in technology, we have started to unravel the complexities of the oral microbiome and gained new insights into its role during both health and disease...
November 18, 2016: British Dental Journal
https://www.readbyqxmd.com/read/27853108/efficacy-and-safety-of-a-therapeutic-apparatus-using-hydrogen-peroxide-photolysis-to-treat-dental-and-periodontal-infectious-diseases
#9
Hirohisa Sato, Yoshimi Niwano, Keisuke Nakamura, Takayuki Mokudai, Hiroyo Ikai, Taro Kanno, Hiroshi Egusa
The present study aimed to evaluate the acute locally injurious property of our most current hydroxyl radical generation system by hydrogen peroxide (H2O2) photolysis. This system, which releases 3% H2O2 with a 405-nm laser, was developed in our laboratory for the treatment of dental and periodontal infectious diseases. First, the hydroxyl radical yield generated by H2O2 photolysis was examined by applying an electron spin resonance-spin trapping technique. Second, the bactericidal effect of the device was examined under a simulant condition in which Streptococcus mutans, a pathogenic bacterial species that causes caries, was irrigated with running 3% H2O2 concomitantly with laser irradiation...
2016: Journal of Toxicological Sciences
https://www.readbyqxmd.com/read/27846621/unstimulated-saliva-related-caries-risk-factors-in-individuals-with-cystic-fibrosis-a-cross-sectional-analysis-of-unstimulated-salivary-flow-ph-and-buffering-capacity
#10
Alaa A Alkhateeb, Lloyd A Mancl, Richard B Presland, Marilynn L Rothen, Donald L Chi
Salivary flow rate, pH, and buffering capacity are associated with dental caries, but studies from the cystic fibrosis (CF) literature are inconclusive regarding these salivary factors and caries. The aim of this study was to evaluate these factors and their associations with dental caries in individuals with CF. Unstimulated whole saliva was collected from individuals aged 6-20 years at Seattle Children's Hospital CF Clinic, USA (n = 83). Salivary flow rate was measured in milliliters per minute. Salivary pH was assessed using a laboratory pH meter...
November 16, 2016: Caries Research
https://www.readbyqxmd.com/read/27837345/molecular-detection-of-bacteria-associated-to-caries-activity-in-dentinal-lesions
#11
Beatriz Gonçalves Neves, Rafael Nóbrega Stipp, Daniela da Silva Bezerra, Sarah Florindo de Figueiredo Guedes, Lidiany Karla Azevedo Rodrigues
OBJECTIVES: This study aimed at identifying and quantifying Actinomyces naeslundii, Bifidobacterium spp., Streptococcus mitis group, Lactobacillus acidophilus, Lactobacillus casei group, Streptococcus gordonii, and Streptococcus mutans in active and inactive carious dentine lesions of children with early childhood caries by using quantitative polymerase chain reaction. MATERIAL AND METHODS: Fifty-six dentin lesion samples, classified as active (n = 39) or inactive (n = 17), were collected from children aged from 2 to 5 years old...
November 12, 2016: Clinical Oral Investigations
https://www.readbyqxmd.com/read/27805895/dentin-topographic-features-following-chemomechanical-caries-removal-in-primary-teeth
#12
R M Kotb, M A Elkateb, A M Ahmed, K Y Kawana, O A El Meligy
AIM: Study the topographic features of dentin after caries removal with a chemomechanical agent (Papacarie) compared with the conventional drilling method. STUDY DESIGN: The sample included 7 exfoliated and extracted primary teeth with carious dentin lesions, not reaching the pulp. Each tooth was sectioned longitudinally through the center of the carious lesions into two halves. The teeth were then divided into two groups according to the method of caries removal...
2016: Journal of Clinical Pediatric Dentistry
https://www.readbyqxmd.com/read/27805882/screening-of-a-pediatric-and-adult-clinic-population-for-caries-pathogen-scardovia-wiggsiae
#13
Lindsay Row, Matthew R Repp, Karl Kingsley
: Dental caries remains one of the most common morbidities worldwide, with research focusing on the most prevalent cariogenic bacteria including Streptococcus, Actionmyces and Lactobacillus species. However, recent evidence has begun to reveal novel pathogens that may alter current understanding of caries risk, including the recently discovered Gram-positive bacillus Scardovia wiggsiae. STUDY DESIGN: This prospective, cross-sectional study collected saliva from healthy adults and children for DNA isolation and PCR screening (n=149) in order to evaluate the prevalence of this potential oral pathogen...
2016: Journal of Clinical Pediatric Dentistry
https://www.readbyqxmd.com/read/27794161/effects-and-effectiveness-of-cavity-disinfectants-in-operative-dentistry-a-literature-review
#14
Mohammed S Bin-Shuwaish
The degree of success in the elimination of bacteria during cavity preparation and prior to the insertion of a restoration may increase the longevity of the restoration and therefore the success of the restorative procedure. The complete eradication of bacteria in a caries-affected tooth, during cavity preparation, is considered a difficult clinical task. In addition to weakening the tooth structure, attempts to excavate extensive carious tissue completely, by only mechanical procedures, may affect the vitality of the pulp...
October 1, 2016: Journal of Contemporary Dental Practice
https://www.readbyqxmd.com/read/27785410/investigation-of-the-n-terminal-coding-region-of-muc7-alterations-in-dentistry-students-with-and-without-caries
#15
L Koç Öztürk, A Yarat, S Akyuz, H Furuncuoglu, K Ulucan
Human low-molecular weight salivary mucin (MUC7) is a small, secreted glycoprotein coded by MUC7. In the oral cavity, they inhibit the colonization of oral bacteria, including cariogenic ones, by masking their surface adhesions, thus helping saliva to avoid dental caries. The N-terminal domain is important for low-molecular weight (MG2) mucins to contact with oral microorganisms. In this study, we aimed to identify the N-terminal coding region of the MUC7 gene between individuals with and without caries. Forty-four healthy dental students were enrolled in this study; 24 of them were classified to have caries [decayed, missing, filled-teeth (DMFT) = 5...
July 1, 2016: Balkan Journal of Medical Genetics: BJMG
https://www.readbyqxmd.com/read/27770768/phage-therapy-a-new-horizon-in-the-antibacterial-treatment-of-oral-pathogens
#16
Mor Shlezinger, Yael Houri-Haddad, Shunit Coppenhagen-Glazer, Grégory Resch, Yok-Ai Que, Shaul Beyth, Elisheva Dorfman, Ronen Hazan, Nurit Beyth
Dental diseases are perhaps the most prevalent infection-related diseases in humans. Biofilm is involved in almost every infectious disease compromising oral health, notably caries, periodontal disease, gingivitis, endodontic infections and peri-implantitis. Current therapies of biofilm-derived oral infections lack sensitivity; they are not species-specific and kill pathogenic species as well as commensal species, which are protective against the formation of pathogenic biofilms. Moreover, antibiotics have a limited effect on biofilm and are almost unused in oral diseases...
September 30, 2016: Current Topics in Medicinal Chemistry
https://www.readbyqxmd.com/read/27766489/no-evidence-for-the-growth-stimulating-effect-of-monomers-on-cariogenic-streptococci
#17
Ivana Nedeljkovic, Kumiko Yoshihara, Jan De Munck, Wim Teughels, Bart Van Meerbeek, Kirsten L Van Landuyt
BACKGROUND: In spite of contradicting results, the high susceptibility of composites for secondary caries is still often associated with the bacterial growth-stimulating effect of released methacrylate monomers. However, most studies that showed this effect were performed with techniques having inherent limitations (spectrophotometry). OBJECTIVES: Therefore, our objective was to determine the effect of four methacrylate monomers (2-Hydroxyethyl methacrylate (HEMA), triethylene glycol dimethacrylate (TEGDMA), ethylene glycol dimethacrylate (EGDMA), diethylene glycol dimethacrylate (DEGDMA)) on the growth of two caries-associated bacteria, Streptococcus mutans and sobrinus, and one non-cariogenic species, Streptococcus sanguinis, using TaqMan quantitative polymerase chain reaction (qPCR) to quantify bacterial DNA...
October 20, 2016: Clinical Oral Investigations
https://www.readbyqxmd.com/read/27759416/dentin-caries-progression-and-the-role-of-metalloproteinases-an-update
#18
F Femiano, R Femiano, L Femiano, A Jamilian, R Rullo, L Perillo
AIM: This review aims to summarise our understanding of the destructive role of acid environment and metalloproteinases in dentin caries progression using a review process. METHOD: The acids resulting from consumption of sugars by acidogenic and aciduric bacteria can cause demineralisation of the tooth surface, but are not able to cause caries-like lesions. The appearance of such lesions requires the activation of enzymatic proteolysis in an acidic environment for degradation of the dentin organic matrix, leading to cavity formation...
September 2016: European Journal of Paediatric Dentistry: Official Journal of European Academy of Paediatric Dentistry
https://www.readbyqxmd.com/read/27740612/alanine-racemase-is-essential-for-the-growth-and-interspecies-competitiveness-of-streptococcus-mutans
#19
Yuan Wei, Wei Qiu, Xue-Dong Zhou, Xin Zheng, Ke-Ke Zhang, Shi-Da Wang, Yu-Qing Li, Lei Cheng, Ji-Yao Li, Xin Xu, Ming-Yun Li
D-alanine (D-Ala) is an essential amino acid that has a key role in bacterial cell wall synthesis. Alanine racemase (Alr) is a unique enzyme that interconverts L-alanine and D-alanine in most bacteria, making this enzyme a potential target for antimicrobial drug development. Streptococcus mutans is a major causative factor of dental caries. The factors involved in the survival, virulence and interspecies interactions of S. mutans could be exploited as potential targets for caries control. The current study aimed to investigate the physiological role of Alr in S...
October 14, 2016: International Journal of Oral Science
https://www.readbyqxmd.com/read/27713460/dens-invaginatus-diagnosis-and-management-strategies
#20
A Gallacher, R Ali, S Bhakta
Dens invaginatus is a developmental malformation, in which there is an infolding of enamel into dentine. These infolds represent stagnation sites for bacteria and can predispose to dental caries. The carious infection can spread via enamel and dentine to contaminate the pulp and cause soft tissue necrosis. The altered and sometimes complex anatomy of affected teeth can make endodontic management challenging. Early diagnosis is therefore essential as prophylactic treatment of the dens can prevent degeneration and pulpal necrosis...
October 7, 2016: British Dental Journal
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