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Remineralization

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https://www.readbyqxmd.com/read/28419783/high-occurrence-of-bathyarchaeota-mcg-in-the-deep-sea-sediments-of-south-china-sea-quantified-using-newly-designed-pcr-primers
#1
Tiantian Yu, Qianyong Liang, Mingyang Niu, Fengping Wang
The archaeal phylum Bathyarchaeota, which is composed of a large number of diverse lineages, is widespread and abundant in marine sediments. Environmental factors that control the distribution, abundance, and evolution of this largely diversified archaeal phylum are currently unclear. In this study, a new pair of specific primers that target the major marine subgroups of bathyarchaeotal 16S rRNA genes was designed and evaluated to investigate the distribution and abundance of Bathyarchaeota in marine sediments...
April 17, 2017: Environmental Microbiology Reports
https://www.readbyqxmd.com/read/28416222/dentin-on-the-nanoscale-hierarchical-organization-mechanical-behavior-and-bioinspired-engineering
#2
REVIEW
Luiz E Bertassoni
OBJECTIVE: Knowledge of the structural organization and mechanical properties of dentin has expanded considerably during the past two decades, especially on a nanometer scale. In this paper, we review the recent literature on the nanostructural and nanomechanical properties of dentin, with special emphasis in its hierarchical organization. METHODS: We give particular attention to the recent literature concerning the structural and mechanical influence of collagen intrafibrillar and extrafibrillar mineral in healthy and remineralized tissues...
April 14, 2017: Dental Materials: Official Publication of the Academy of Dental Materials
https://www.readbyqxmd.com/read/28413590/effect-of-nano-hydroxyapatite-toothpaste-on-microhardness-ofartificial-carious-lesions-created-on-extracted-teeth
#3
Asghar Ebadifar, Mohammad Nomani, Sayed Ali Fatemi
Background. Many types of toothpastes contain substances that can remineralize initial enamel caries. This study aimed to assess the effect of nano-hydroxyapatite (NHA) on microhardness of artificially created carious lesions. Methods. In this in vitro study, NHA was prepared using sol-gel technique and added to the toothpaste with 7% concentration. A total of 80 extracted sound teeth were collected. The crowns were polished using 500-grit abrasive paper. The specimens were randomly coded from 1 to 80. Number 1 to 40 were assigned to group A and numbers 41 to 80 to group B...
2017: Journal of Dental Research, Dental Clinics, Dental Prospects
https://www.readbyqxmd.com/read/28366870/distribution-of-n2o-in-the-eastern-shelf-of-the-gulf-of-cadiz-sw-iberian-peninsula
#4
A Sierra, D Jiménez-López, T Ortega, R Ponce, M J Bellanco, R Sánchez-Leal, A Gómez-Parra, J Forja
Distribution of N2O has been determined in eight cruises along three transects (Guadalquivir, Sancti Petri and Trafalgar) in the Gulf of Cadiz, during 2014 and 2015. The mean N2O value for this area was 10.0±0.9nM, with large spatial and temporal variations. Stratification in the water column has been observed; the concentration of this gas increases with the depth, because of the presence of the Eastern North Atlantic Central Water (ENACW) and the Mediterranean Outflow Waters (MOW). The N2O production measured in this study is mainly due to nitrification...
March 30, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/28365815/evaluation-of-the-effectiveness-of-micro-raman-spectroscopy-in-monitoring-the-mineral-contents-change-of-human-enamel-in-vitro
#5
Yue Sa, Xiaowei Feng, Chang Lei, Yan Yu, Tao Jiang, Yining Wang
The purpose of this in vitro study was to investigate the efficacy of micro-Raman spectroscopy on detecting mineral content change during the demineralization and de/remineralization cycling process. The enamel samples (n = 55) were randomly divided into three groups and separately treated with demineralization solution (n = 20), de/remineralization cycling solution (n = 30), and distilled water (n = 5). Micro-Raman spectroscopy, microhardness (MHS), and the released calcium ions concentration were performed before and after treatment, respectively...
April 1, 2017: Lasers in Medical Science
https://www.readbyqxmd.com/read/28346861/biomimetic-remineralization-of-carious-lesions-by-self-assembling-peptide
#6
L Kind, S Stevanovic, S Wuttig, S Wimberger, J Hofer, B Müller, U Pieles
Caries is the most common disease in the world. Great efforts have been undertaken for prevention and to identify a regenerative treatment solution for dental caries. Self-assembling β-sheet forming peptides have previously shown to form 3-dimensional fiber networks supporting tissue regeneration. In particular, the self-assembling peptide P11-4 has shown potential in the treatment and prevention of dental caries. It has previously been shown that application of monomeric P11-4 solution to early carious lesions can increase net mineral gain by forming de novo hydroxyapatite crystals...
March 1, 2017: Journal of Dental Research
https://www.readbyqxmd.com/read/28337586/the-role-of-fluoride-and-chlorhexidine-in-preserving-hardness-and-mineralization-of-enamel-and-cementum-after-gamma-irradiation
#7
Rowida Abdalla, Maha A Niazy, Wael E Jamil, Hala A Hazzaa, Amal A Elbatouti
The purpose of this study was to evaluate the effect of 0.05% sodium fluoride and 0.12% chlorhexidine mouthwashes on the micro-hardness of tooth enamel and cementum that was exposed to therapeutic doses of gamma radiation. Sixty extracted human teeth were divided into two groups, one was irradiated, the other was not irradiated. The two groups were further subdivided into three subgroups, which were each treated either with 0.05% sodium fluoride or with 0.12% chlorhexidine; the third subgroup served as a control...
May 2017: Radiation and Environmental Biophysics
https://www.readbyqxmd.com/read/28334391/sediment-anoxia-limits-microbial-driven-seagrass-carbon-remineralization-under-warming-conditions
#8
Stacey M Trevathan-Tackett, Justin R Seymour, Daniel A Nielsen, Peter I Macreadie, Thomas C Jeffries, Jonathan Sanderman, Jeff Baldock, Johanna M Howes, Andrew D L Steven, Peter Ralph
Seagrass ecosystems are significant carbon sinks, and their resident microbial communities ultimately determine the quantity and quality of carbon sequestered. However, environmental perturbations have been predicted to affect microbial-driven seagrass decomposition and subsequent carbon sequestration. Utilizing techniques including 16S-rDNA sequencing, solid-state NMR and microsensor profiling, we tested the hypothesis that elevated seawater temperatures and eutrophication enhance the microbial decomposition of seagrass leaf detritus and rhizome/root tissues...
March 15, 2017: FEMS Microbiology Ecology
https://www.readbyqxmd.com/read/28326069/different-bacterial-communities-involved-in-peptide-decomposition-between-normoxic-and-hypoxic-coastal-waters
#9
Shuting Liu, Boris Wawrik, Zhanfei Liu
Proteins and peptides are key components of the labile dissolved organic matter pool in marine environments. Knowing which types of bacteria metabolize peptides can inform the factors that govern peptide decomposition and further carbon and nitrogen remineralization in marine environments. A (13)C-labeled tetrapeptide, alanine-valine-phenylalanine-alanine (AVFA), was added to both surface (normoxic) and bottom (hypoxic) seawater from a coastal station in the northern Gulf of Mexico for a 2-day incubation experiment, and bacteria that incorporated the peptide were identified using DNA stable isotope probing (SIP)...
2017: Frontiers in Microbiology
https://www.readbyqxmd.com/read/28322218/remineralization-of-particulate-organic-carbon-in-an-ocean-oxygen-minimum-zone
#10
E L Cavan, M Trimmer, F Shelley, R Sanders
Biological oceanic processes, principally the surface production, sinking and interior remineralization of organic particles, keep atmospheric CO2 lower than if the ocean was abiotic. The remineralization length scale (RLS, the vertical distance over which organic particle flux declines by 63%, affected by particle respiration, fragmentation and sinking rates) controls the size of this effect and is anomalously high in oxygen minimum zones (OMZ). Here we show in the Eastern Tropical North Pacific OMZ 70% of POC remineralization is due to microbial respiration, indicating that the high RLS is the result of lower particle fragmentation by zooplankton, likely due to the almost complete absence of zooplankton particle interactions in OMZ waters...
March 21, 2017: Nature Communications
https://www.readbyqxmd.com/read/28296648/salivary-acquired-pellicle-inspired-dpspseekc-peptide-for-the-restoration-of-demineralized-tooth-enamel
#11
Yinxin Yang, Bo Yang, Mingze Li, Yaning Wang, Xiao Yang, Jianshu Li
Salivary acquired pellicle (SAP) is a layer of proteins and glycoproteins of salivary origin that tightly coat the tooth surface. Statherin is an important part of the SAP. The initial six-peptide sequence DpSpSEEK (where pS denotes phosphorylated serine) of the N-terminus of statherin can be immobilized on a hydroxyapatite (HAP) surface and the negatively charged domains of the DpSpSEEK side chain can catch free Ca(2+) in saliva due to the charge adsorption effect. In order to prepare more functional materials based on DpSpSEEK, we designed a cysteine-labeled peptide sequence DpSpSEEKC, which could conjugate other macromolecules by forming a sulfur-based linkage...
March 15, 2017: Biomedical Materials
https://www.readbyqxmd.com/read/28292334/in-vivo-effect-of-calcium-hydroxide-and-resin-modified-glass-ionomer-cement-on-carious-dentin-in-young-permanent-molars-an-ultrastructural-and-macroscopic-study
#12
Shireen Opal, Shalini Garg, Deepak Sharma, Abhishek Dhindsa, Isha Jatana
PURPOSE: The purpose of this study was to evaluate macroscopically and ultrastructurally the effect of calcium hydroxide cement (CH) and resin-modified glass ionomer cement (RMGIC) compared with gutta percha (control) as a lining material on carious dentin after partial caries removal and sealing. METHODS: Twenty-seven permanent molars with deep carious lesions underwent partial caries removal with the application of CH, RMGIC, or gutta percha (control) and were then sealed for three months...
January 15, 2017: Pediatric Dentistry
https://www.readbyqxmd.com/read/28288296/effect-of-cpp-acp-or-a-potassium-nitrate-sodium-fluoride-dentifrice-on-enamel-erosion-prevention
#13
F I Zawaideh, A I Owais, S Mushtaha
AIM: To investigate in situ/ex vivo the effect of remineralizing agents in the prevention of dental erosion in permanent and primary teeth. STUDY DESIGN: A randomized, controlled, double-blind study with crossover design with three treatment phases: Control, ProNamel(®) and Tooth Mousse(™). Twenty adults and children wore removable palatal appliances containing two insets of permanent and primary human enamel and used the corresponding assigned toothpaste twice daily for 10 days...
2017: Journal of Clinical Pediatric Dentistry
https://www.readbyqxmd.com/read/28286496/response-of-bacterial-communities-to-different-detritus-compositions-in-arctic-deep-sea-sediments
#14
Katy Hoffmann, Christiane Hassenrück, Verena Salman-Carvalho, Moritz Holtappels, Christina Bienhold
Benthic deep-sea communities are largely dependent on particle flux from surface waters. In the Arctic Ocean, environmental changes occur more rapidly than in other ocean regions, and have major effects on the export of organic matter to the deep sea. Because bacteria constitute the majority of deep-sea benthic biomass and influence global element cycles, it is important to better understand how changes in organic matter input will affect bacterial communities at the Arctic seafloor. In a multidisciplinary ex situ experiment, benthic bacterial deep-sea communities from the Long-Term Ecological Research Observatory HAUSGARTEN were supplemented with different types of habitat-related detritus (chitin, Arctic algae) and incubated for 23 days under in situ conditions...
2017: Frontiers in Microbiology
https://www.readbyqxmd.com/read/28281957/effects-of-remineralization-agents-on-artificial-carious-lesions
#15
Selcuk Savas, Ebru Kucukyilmaz, Esra Uzer Celik
PURPOSE: The purpose of this study was to evaluate the remineralization potentials of different agents on demineralized enamel surfaces. METHODS: Four hundred and sixty extracted human molars with artificial carious lesions were divided into six groups: (1) control; (2) acidulated phosphate fluoride (APF); (3) Curodont Repair (CR); (4) silver diamine fluoride (SDF); (5) ammonium hexafluorosilicate (SiF); and (6) SiF plus cetylpiridinium chloride (SiF+CPC). They were subdivided according to immersion periods (seven out of 30 days)...
November 15, 2016: Pediatric Dentistry
https://www.readbyqxmd.com/read/28275354/in-vitro-acid-mediated-initial-dental-enamel-loss-is-associated-with-genetic-variants-previously-linked-to-caries-experience
#16
Alexandre R Vieira, Merve Bayram, Figen Seymen, Regina C Sencak, Frank Lippert, Adriana Modesto
We have previously shown that AQP5 and BTF3 genetic variation and expression in whole saliva are associated with caries experience suggesting that these genes may have a functional role in protecting against caries. To further explore these results, we tested ex vivo if variants in these genes are associated with subclinical dental enamel mineral loss. DNA and enamel samples were obtained from 53 individuals. Enamel samples were analyzed for Knoop hardness of sound enamel, integrated mineral loss after subclinical carious lesion creation, and change in integrated mineral loss after remineralization...
2017: Frontiers in Physiology
https://www.readbyqxmd.com/read/28270154/pandemics-pathogenicity-and-changing-molecular-epidemiology-of-cholera-in-the-era-of-global-warming
#17
REVIEW
Fazle Rabbi Chowdhury, Zannatun Nur, Nazia Hassan, Lorenz von Seidlein, Susanna Dunachie
BACKGROUND: Vibrio cholerae, a Gram-negative, non-spore forming curved rod is found in diverse aquatic ecosystems around the planet. It is classified according to its major surface antigen into around 206 serogroups, of which O1 and O139 cause epidemic cholera. A recent spatial modelling technique estimated that around 2.86 million cholera cases occur globally every year, and of them approximately 95,000 die. About 1.3 billion people are currently at risk of infection from cholera. Meta-analysis and mathematical modelling have demonstrated that due to global warming the burden of vector-borne diseases like malaria, leishmaniasis, meningococcal meningitis, viral encephalitis, dengue and chikungunya will increase in the coming years in the tropics and beyond...
March 7, 2017: Annals of Clinical Microbiology and Antimicrobials
https://www.readbyqxmd.com/read/28261179/characterization-of-potential-polysaccharide-utilization-systems-in-the-marine-bacteroidetes-gramella-flava-jlt2011-using-a-multi-omics-approach
#18
Kai Tang, Yingfan Lin, Yu Han, Nianzhi Jiao
Members of phylum Bacteroidetes are distributed across diverse marine niches and Flavobacteria is often the predominant bacterial class decomposing algae-derived polysaccharides. Here, we report the complete genome of Gramella flava JLT2011 (Flavobacteria) isolated from surface water of the southeastern Pacific. A remarkable genomic feature is that the number of glycoside hydrolase (GH) genes in the genome of G. flava JLT2011 is more than 2-fold higher than that of other Gramella species. The functional profiles of the GHs suggest extensive variation in Gramella species...
2017: Frontiers in Microbiology
https://www.readbyqxmd.com/read/28259311/therapies-for-white-spot-lesions-a-systematic-review
#19
REVIEW
Anabela Baptista Pereira Paula, Ana Rita Fernandes, Ana Sofia Coelho, Carlos Miguel Marto, Manuel Marques Ferreira, Francisco Caramelo, Francisco do Vale, Eunice Carrilho
INTRODUCTION: The first sign of dental caries is denoted by white spot lesions (WSLs) which can be defined as a demineralization of the enamel surface and subsurface, although these lesions can be reversed and do not form cavities. The aim of this systematic review was investigate which remineralization agents are effective for the treatment of WSLs. MATERIALS AND METHODS: For this systematic review a literature search was conducted on Pubmed, Cochrane Library and ScienceDirect...
March 2017: Journal of Evidence-based Dental Practice
https://www.readbyqxmd.com/read/28258713/toothbrushing-duration-and-dentifrice-dosage-are-associated-with-remineralization-of-enamel-specimens
#20
Romina Brignardello-Petersen
No abstract text is available yet for this article.
March 1, 2017: Journal of the American Dental Association
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