scholarly journals Novel Nanocomposite Inhibiting Caries at the Enamel Restoration Margins in an In Vitro Saliva-Derived Biofilm Secondary Caries Model

2020 ◽  
Vol 21 (17) ◽  
pp. 6369
Author(s):  
Wen Zhou ◽  
Xinyu Peng ◽  
Xuedong Zhou ◽  
Andrea Bonavente ◽  
Michael D. Weir ◽  
...  
Keyword(s):  
Low Ph ◽  
The Novel ◽  
Antibacterial Effects ◽  
Ion Release ◽  
Secondary Caries ◽  
Colony Forming Units ◽  
Caries Model ◽  
Bovine Enamel ◽  
First Time

Secondary caries often occurs at the tooth-composite margins. This study developed a novel bioactive composite containing DMAHDM (dimethylaminohexadecyl methacrylate) and NACP (nanoparticles of amorphous calcium phosphate), inhibiting caries at the enamel restoration margins in an in vitro saliva-derived biofilm secondary caries model for the first time. Four composites were tested: (1) Heliomolar nanocomposite, (2) 0% DMAHDM + 0% NACP, (3) 3% DMAHDM + 0% NACP, (D) 3% DMAHDM + 30% NACP. Saliva-derived biofilms were tested for antibacterial effects of the composites. Bovine enamel restorations were cultured with biofilms, Ca and P ion release of nanocomposite and enamel hardness at the enamel restoration margins was measured. Incorporation of DMAHDM and NACP into composite did not affect the mechanical properties (p > 0.05). The biofilms’ CFU (colony-forming units) were reduced by 2 logs via DMAHDM (p < 0.05). Ca and P ion release of the nanocomposite was increased at cariogenic low pH. Enamel hardness at the margins for DMAHDM group was 25% higher than control (p < 0.05). With DMAHDM + NACP, the enamel hardness was the greatest and about 50% higher than control (p < 0.05). Therefore, the novel composite containing DMAHDM and NACP was strongly antibacterial and inhibited enamel demineralization, resulting in enamel hardness at the margins under biofilms that approached the hardness of healthy enamel.

scholarly journals Novel Highly Degradable Chloride Containing Bioactive Glasses

2015 ◽  
Vol 1 (1) ◽  
Author(s):  
Xiaojing Chen ◽  
Natalia Karpukhina ◽  
Delia S. Brauer ◽  
Robert G. Hill
Keyword(s):  
Chemical Analysis ◽  
Chloride Content ◽  
Tris Buffer ◽  
Silicate Glasses ◽  
Ion Release ◽  
Bioactive Glasses ◽  
Glass Density ◽  
31P Mas Nmr ◽  
First Time

AbstractAddition of CaF2 to a silicate bioactive glass favours formation of fluorapatite, which is less soluble in acidic environment than hydroxyapatite. However, excess CaF2 in the glass is problematic, owing to the formation of crystalline calcium fluoride rather than fluorapatite on immersion. In this paper we investigate chloride as an alternative to fluoride in bioactive silicate glasses and in particular their bioactivity for the first time. Meltderived bioactive glasses based on SiO2-P2O5-CaO-CaCl2 with varying CaCl2 contents were synthesised and characterised by DSC. Chemical analysis of the chloride content was performed by using an ion selective electrode. Glass density was determined using Helium Pycnometry. The glass bioactivity was investigated in Tris buffer. Ion release measurements were carried out by using ICP-OES. The chemical analysis results indicated that the majority of the chloride is retained in the Q2 type silicate glasses during synthesis. Tg and glass density reduced with increasing CaCl2 content. Apatite-like phase formation was confirmed by FITR, XRD and 31P MAS-NMR. The results of the in vitro studies demonstrated that the chloride containing bioactive glasses are highly degradable and form apatite-like phase within three hours in Tris buffer and, therefore, are certainly suitable for use in remineralising toothpastes. The dissolution rate of the glass was found to increase with CaCl2 content. Faster dissolving bioactive glasses may be attractive for more resorbable bone grafts and scaffolds.

scholarly journals Probiotic Effects on Multispecies Biofilm Composition, Architecture, and Caries Activity In Vitro

2020 ◽  
Vol 8 (9) ◽  
pp. 1272
Author(s):  
Zhihui Chen ◽  
Sebastian Schlafer ◽  
Gerd Göstemeyer ◽  
Falk Schwendicke
Keyword(s):  
Lactobacillus Reuteri ◽  
Quantitative Polymerase Chain Reaction ◽  
Lactobacillus Rhamnosus ◽  
Negative Control ◽  
Caries Activity ◽  
Actinomyces Naeslundii ◽  
Colony Forming Units ◽  
Bovine Enamel ◽  
Culture Supernatants

While probiotics have been tested for their anti-caries effect in vitro and also clinically, there is a lack of understanding of their effects on complex dental biofilms. We assessed two probiotics, Lactobacillus reuteri and Streptococcus oligofermentans, on a continuous-cultured model containing Streptococcus mutans, Lactobacillus rhamnosus and Actinomyces naeslundii. Cariogenic biofilms were grown on bovine enamel specimens and daily challenged with L. reuteri or S. oligofermentans whole culture (LC/SC) or cell-free supernatant (LS/SS) or medium only (negative control, NC) (n = 21/group) for 10 days. Biofilm was assessed via counting colony-forming units, quantitative polymerase chain reaction, and fluorescence in situ hybridization. Caries activity was determined by pH measurements and by assessing mineral loss (ΔZ) using transverse microradiography. Both LC and SC significantly reduced total and strain-specific cariogenic bacterial numbers (p < 0.05). ΔZ was reduced in LC (mean ± SD: 1846.67 ± 317.89) and SC (3315.87 ± 617.30) compared to NC (4681.48 ± 495.18, p < 0.05). No significant reductions in bacterial numbers and ΔZ was induced by supernatants. Biofilm architecture was not considerably affected by probiotic applications. Viable probiotics L. reuteri and S. oligofermentans, but not their culture supernatants, could reduce the caries activity of multi-species biofilms in vitro.

scholarly journals Potentials of Mouthwashes in Disinfecting Cariogenic Bacteria and Biofilms Leading to Inhibition of Caries

2012 ◽  
Vol 6 (1) ◽  
pp. 23-30 ◽  
Author(s):  
Takehiro Oyanagi ◽  
Junji Tagami ◽  
Khairul Matin
Keyword(s):  
Ex Vivo ◽  
Secondary Caries ◽  
Bacterial Viability ◽  
Cariogenic Bacteria ◽  
Benzethonium Chloride ◽  
Large Numbers ◽  
Carious Lesions ◽  
Colony Forming Units ◽  
Caries Model ◽  
Phosphate Buffered Saline

Objectives:The aim of this study was to compare the effects of certain commercially available mouthwashes on cariogenic bacteria and biofilms, following the acquisition of inhibition potentials of caries.Materials and Methods:Mouthwashes containing I) chlorhexidine gluconate (CHG; 0.0005% w/v), II) benzethonium chloride (BTC; 0.01% w/v), III) an essential oil (Listerine), and IV) povidone-iodine (PVP-I; 0.035% w/v) were tested on planktonic cariogenic bacteria, biofilms, and an ex vivo caries model. Bacterial aliquots were inoculated with each solution separately and vortexed for 10 seconds at room temperature. Bacterial viability was subsequently investigated by fluorescence microscopy (FM) after staining with a BacLight viability kit and the number of colony-forming units (CFUs) was counted. Similarly, mouthwash solutions were applied to artificial cariogenic biofilms, and bacterial viability of the biofilms was investigated as stated above. Inhibition potentials of two selected mouthwashes of carious lesions were investigated using biofilm-induced caries and a secondary caries model. In all steps, a phosphate-buffered saline (PBS) solution was included as a control.Results:Planktonic cariogenic bacteria and bacteria embedded in biofilms were killed in remarkably large numbers with Listerine and PVP-I treatment compared to PBS and other gargles. CFU counts also showed significant reduction after treatment with Listerine and PVP-I compared to other solutions (P<0.05). Listerine also displayed significant (P<0.05) inhibition effects in preventing the progression of demineralization.Conclusion:Bactericidal potencies of the mouthwashes varied significantly, suggesting that mouthwashes like Listerine can be useful for the prevention of caries and secondary caries.

scholarly journals Zn-contained mussel-inspired film on Mg alloy for inhibiting bacterial infection and promoting bone regeneration

2020 ◽  
Author(s):  
Feng Peng ◽  
Shi Cheng ◽  
Ruiying Zhang ◽  
Mei Li ◽  
Jielong Zhou ◽  
...  
Keyword(s):  
Early Stage ◽  
Orthopedic Implants ◽  
Az31 Alloy ◽  
Electrochemical Analysis ◽  
Coated Sample ◽  
The Novel ◽  
Ion Release ◽  
Inflammatory Phenotype ◽  
Anti Inflammation

Abstract Infection and insufficient osteointegration are the main causes of orthopedic implant failure. Furthermore, activating favorable inflammation response is vital to the fast osteointegration of implants. Therefore, endowing the implants with multifunctions (antibacterial, anti-inflammation, and pro-osteointegration) is a promising strategy to improve the performance of orthopedic implants. In this study, a Zn-contained polydopamine (PDA) film was fabricated on AZ31 alloy. The film possessed a stable Zn ion release in 14 days. The results of electrochemical analysis implied the favorable corrosion protection of the film, and thus, leading to a suitable hemolysis ratio (below 1%). The in vitro antibacterial assessment revealed that the film exhibited excellent resistance against Staphylococcus aureus (nearly 100%), which can be ascribed to the release of Zn ions. The cell-culture evaluation revealed that the extract of Zn-contained PDA-coated sample can activate RAW264.7 polarization to an anti-inflammatory phenotype, as well as enhance the osteogenic differentiation ability of MC3T3-E1. Additionally, the femoral osteomyelitis model indicated that the as-prepared film had a high antibacterial capability at early stage of the implantation, and showed better osteogenesis and osteointegration after 8 weeks of implantation. With favorable antibacterial, anti-inflammation, and pro-osteogenesis abilities, the novel designed Zn-contained PDA film is promising to be used in Mg-based orthopedic implants.

scholarly journals Extraction, isolation, characterization, semi-synthesis and antiplasmodial activity of Justicia adathoda leaves

2016 ◽  
Vol 11 (4) ◽  
pp. 878 ◽  
Author(s):  
Sivaperumal Gopalan ◽  
Kannnan Kulanthai ◽  
Gnanavel Sadashivam ◽  
Perumal Pachiappan ◽  
Sowmiya Rajamani ◽  
...  
Keyword(s):  
Video Clip ◽  
Ethanol Extract ◽  
Antiplasmodial Activity ◽  
The Novel ◽  
Lead Compound ◽  
Standard Drug ◽  
Synthetic Compounds ◽  
Justicia Adhatoda ◽  
First Time

<p>There is a need to investigate the new sources of antimalarial drugs which are more effective against Plasmodium falciparum. The present study was undertaken to evaluate the in vitro antiplasmodial activity of vasicinone, vasicine and 9-oxo-1, 2, 3, 9-tetrahydropyrrolo [2,1-b]quinazolin-3-yl acetate (VA-1). Vasicinone and vasicine were extracted from the leaves of Justicia adhatoda. The novel compound VA-1 was synthesized from alkaloid the alkaloid vasicine, which was isolated from the ethanol extract of J. adhatoda leaves. Vasicine (IC<sub>50</sub> = 89.8 µg/mL) and vasicinone (IC<sub>50</sub> = 38.9 µg/mL) showed moderate antiplasmodial activity whereas the compound VA-1 ( IC<sub>50</sub>  = 06.0 µg/mL) showed excellent antiplasmodial activity when compared with standard drug chloroquine (IC<sub>50</sub>  = 12.6 µg/mL). The results achieved suggest that both isolated and semi-synthetic compounds may serve as a lead compound to antiplasmodial activity. Further, the compound VA-1 is for the first time reported for antiplasmodial activity with IC<sub>50</sub> value.</p><p><strong>Video Clip:</strong></p><p><a href="https://youtube.com/v/dcQUBU6PuVw">Antiplasmodia activity procedure</a>: 7 min 13 sec</p>

scholarly journals An artificial biofilm induced secondary caries model for in vitro studies

2011 ◽  
Vol 56 (1) ◽  
pp. 40-47 ◽  
Author(s):  
F Hayati ◽  
A Okada ◽  
Y Kitasako ◽  
J Tagami ◽  
K Matin
Keyword(s):  
In Vitro Studies ◽  
Secondary Caries ◽  
Caries Model ◽  
Artificial Biofilm

scholarly journals Soymilk residue (okara) as a natural immobilization carrier forLactobacillus plantarumcells enhances soymilk fermentation, glucosidic isoflavone bioconversion, and cell survival under simulated gastric and intestinal conditions

PeerJ ◽  
2016 ◽  
Vol 4 ◽  
pp. e2701 ◽  
Author(s):  
Xia Xiudong ◽  
Wang Ying ◽  
Liu Xiaoli ◽  
Li Ying ◽  
Zhou Jianzhong
Keyword(s):  
Specific Growth ◽  
Cell Immobilization ◽  
Low Ph ◽  
Plate Count ◽  
Lag Phase ◽  
Titrable Acidity ◽  
Colony Forming Units ◽  
Kinetics Of ◽  
Acetic Acids

Cell immobilization is an alternative to microencapsulation for the maintenance of cells in a liquid medium. However, artificial immobilization carriers are expensive and pose a high safety risk. Okara, a food-grade byproduct from soymilk production, is rich in prebiotics. Lactobacilli could provide health enhancing effects to the host. This study aimed to evaluate the potential of okara as a natural immobilizer forL. plantarum70810 cells. The study also aimed to evaluate the effects of okara-immobilizedL. plantarum70810 cells (IL) on soymilk fermentation, glucosidic isoflavone bioconversion, and cell resistance to simulated gastric and intestinal stresses. Scanning electron microscopy (SEM) was used to show cells adherence to the surface of okara. Lactic acid, acetic acid and isoflavone analyses in unfermented and fermented soymilk were performed by HPLC with UV detection. Viability and growth kinetics of immobilized and freeL. plantarum70810 cells (FL) were followed during soymilk fermentation. Moreover, changes in pH, titrable acidity and viscosity were measured by conventional methods. For in vitro testing of simulated gastrointestinal resistance, fermented soymilk was inoculated with FL or IL and an aliquot incubated into acidic MRS broth which was conveniently prepared to simulate gastric, pancreatic juices and bile salts. Survival to simulated gastric and intestinal stresses was evaluated by plate count of colony forming units on MRS agar. SEM revealed that the lactobacilli cells attached and bound to the surface of okara. Compared with FL, IL exhibited a significantly higher specific growth rate, shorter lag phase of growth, higher productions of lactic and acetic acids, a faster decrease in pH and increase in titrable acidity, and a higher soymilk viscosity. Similarly, IL in soymilk showed higher productions of daizein and genistein compared with the control. Compared with FL, IL showed reinforced resistance to simulatedgastric and intestinal stresses in vitro that included low pH, low pH plus pepsin, pancreatin, and bile salt. Our results indicate that okara is a new potential immobilization carrier to enhance the growth and glucosidic isoflavone bioconversion activities ofL. plantarumin soymilk and improve cell survivability following simulated gastric and intestinal conditions.

scholarly journals Treatment and prevention of Salomellosis in puppies using Lactobacillus acidophilus

2008 ◽  
Vol 32 (1) ◽  
pp. 214-222
Author(s):  
S. A.G. Al-Samarrae
Keyword(s):  
Lactobacillus Acidophilus ◽  
Biochemical Parameters ◽  
Bile Salts ◽  
Intestinal Epithelial Cells ◽  
Low Ph ◽  
Intestinal Epithelial ◽  
Standard Strain ◽  
Treatment And Prevention ◽  
First Time

This study was carried out to evaluate the ability of Lactobacillusacidophilus to prevent and treat Salmonella typhimurium in puppies. In vitroantibiotic sensitivity test of S. typhimurium was made and the result revealedthat Ciprofloxacin is the most effective.Isolation of L. acidophilus from theintestinal tract of the normal dogs and also revealed that all Lactobacillus strainswere biochemically identical to standard strain. A bacterial strain that had highability to inhibit the growth of S. typhimurium in vitro with high ability toadhere to intestinal epithelial cells and tolerate the low pH and bile salts waschosen for the experimental study.Twenty puppies were divided into four groups and treated in different ways.The clinical, haematological and biochemical parameters were obtained from allanimals at the period of two days before inoculation until the death of animals ofthe first group at the sixth day post infection. The results revealed that , puppiesexperimentally infected with S.typhimurium showed both septicemic andgastrointestinal forms of the disease accompanied with isolation ofS.typhimurium from the blood and stool throughout the experiment. Thestatistical analysis of the results of all parameters among all groups revealed ,forthe first time, that L.acidophilus plays an important role in the prevention ofS.typhimurium infection in puppies . It also has high therapeutic effect againstS.typhimurium, which was almost similar to that of Ciprofloxacin.

scholarly journals Novel Antiplasmodial Agents from Christia vespertilionis

2013 ◽  
Vol 8 (11) ◽  
pp. 1934578X1300801 ◽  
Author(s):  
Harish C. Upadhyay ◽  
Brijesh S. Sisodia ◽  
Harveer S. Cheema ◽  
Jyoti Agrawal ◽  
Anirban Pal ◽  
...  
Keyword(s):  
Antimalarial Activity ◽  
Complete Suppression ◽  
The Novel ◽  
Aqueous Methanol ◽  
Isolation And Characterization ◽  
First Time ◽  
Detailed Chemical

The roots, leaves and stems of Christia vespertilionis were separately and successively extracted with methanol and aqueous-methanol (1:4, v/v) and were evaluated in vitro for their antiplasmodial potential against Plasmodium falciparum NF-54. The aqueous-methanolic stem (AS) extract was the most active (IC50 7.5 μg/mL) followed by the methanolic leaf (ML) extract (IC50 32.0 μg/mL). The in vivo antimalarial activity of the combined plant extract of C. vespertilionis was also assessed in P. berghei infected mice, which showed 87.8% suppression of parasitaemia as compared with complete suppression by chloroquine on day 8. Finally, detailed chemical investigation of C. vespertilionis resulted in the isolation and characterization of fifteen compounds (1–15), of which two (1 and 4) are being reported for the first time from nature. The novel compound 1 possesses potent antiplasmodial activity (IC50 = 9.0 μg/mL).

Effect of the Probiotic Lactobacillus rhamnosus LB21 on the Cariogenicity of Streptococcus mutans UA159 in a Dual-Species Biofilm Model

2015 ◽  
Vol 49 (6) ◽  
pp. 583-590 ◽  
Author(s):  
Constanza E. Fernández ◽  
Rodrigo A. Giacaman ◽  
Livia M. Tenuta ◽  
Jaime A. Cury
Keyword(s):  
Streptococcus Mutans ◽  
Culture Media ◽  
Lactobacillus Rhamnosus ◽  
Surface Hardness ◽  
Single Species ◽  
Initial Inoculum ◽  
Biofilm Model ◽  
Caries Model ◽  
Bovine Enamel

Despite promising results using probiotics, evidence of the preventive effect on enamel demineralization is insufficient and the cariogenic potential of probiotics is still controversial. Probiotics could affect biofilm formation and interfere with adherence, growth or coaggregation with Streptococcus mutans in biofilms. However, most of the studies have been conducted using planktonic bacteria. Hence, the aim of the study was to assess the effect of probiotic bacteria on the cariogenicity of S. mutans using an in vitro biofilm caries model on enamel. Single-species biofilms (S. mutans UA159, SM or Lactobacillus rhamnosus LB21, LB) or dual-species biofilms simultaneously inoculated (SM + LB) or LB inoculated 8 h after SM (SM → LB) were grown for 96 h. Biofilms were formed on bovine enamel saliva-coated slabs of known surface hardness (SH) and immersed in culture media. Biofilms were exposed 8 times per day to 10% sucrose. Medium pH was monitored twice daily as a biofilm acidogenicity indicator. After 96 h, biofilms were collected to determine biomass and bacteria viability. Slab demineralization was calculated as percentage of SH loss (%SHL). Additionally, the model was tested with different concentrations of the initial inoculum (103, 106, 108 cells/ml) and different adhesion times (2 or 8 h). The dual-species biofilm revealed no LB effects on SM cariogenicity, without changes in acidogenicity or %SHL among groups (p > 0.05, n = 12). Lack of activity of LB on SM cariogenicity persisted even when 105 times higher concentration of the probiotic was tested. Coaggregation was not observed. In conclusion, findings suggest that LB does not reduce cariogenicity of SM in a validated experimental caries model.

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