INFLUENCE OF LASER Er,Cr:YSGG ASSOCIATED OR NOT WITH FLUORIDE VARNISH IN THE DENTIN ACID RESISTANCE AFTER EROSIVE CHALLENGE

One of the non-invasive methods for treating discoloration of hard tooth tissues is teeth whitening. The aim of this work is to assess the dynamics of changes in the acid resistance of enamel and hard tissues of teeth and the rate of its remineralization after the procedure of office teeth whitening. The study involved 123 patients aged 18 to 35 years with discoloration of various origins, with the color of hard tooth tissues on the Vita Classic A2 scale and darker. Before performing the office, teeth whitening procedure, all patients gave their written voluntary informed consent to participate in this study, as well as consent to the processing of personal data. Depending on the chosen method of office teeth whitening, patients were divided into 3 groups. The resistance of hard tooth tissues was judged based on the determination of TOER and CASRE tests. These indicators were determined at various times (5 days before the office teeth whitening procedure, 5 days after it, after 14, 30 days and 6 months). Regardless of the chosen whitening system, the office teeth whitening procedure is accompanied by a decrease in the enamel's resistance to acids and a decrease in the rate of its remineralization. The remineralizing function of oral fluid promotes the positive dynamics of the studied parameters after 14 days and after 30 days values increased due to the appointment of remineralizing therapy to all patients in 2 weeks after the teeth whitening procedure. After 6 months, all patients had high enamel resistance and the rate of its remineralization.

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NSSMC ADVANCED 347AP

Alloy Digest ◽

10.31399/asm.ad.ss1310 ◽

2019 ◽

Vol 68 (10) ◽

Keyword(s):

Stainless Steel ◽

High Temperature ◽

Austenitic Stainless Steel ◽

Acid Resistance ◽

High Temperature Strength ◽

Temperature Performance

Abstract NSSMC Advanced 347AP is an austenitic stainless steel with excellent polythionic acid resistance and good high-temperature strength. This datasheet provides information on composition as well as creep. It also includes information on high temperature performance. Filing Code: SS-1310. Producer or source: Nippon Steel.

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Faculty Opinions recommendation of The ABC-type multidrug resistance transporter LmrCD is responsible for an extrusion-based mechanism of bile acid resistance in Lactococcus lactis.

Faculty Opinions – Post-Publication Peer Review of the Biomedical Literature ◽

10.3410/f.1135908.593003 ◽

2008 ◽

Author(s):

Kim Lewis ◽

Danuta Tomkiewicz

Keyword(s):

Multidrug Resistance ◽

Bile Acid ◽

Lactococcus Lactis ◽

Acid Resistance ◽

Multidrug Resistance Transporter

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Faculty Opinions recommendation of A genetically incorporated crosslinker reveals chaperone cooperation in acid resistance.

Faculty Opinions – Post-Publication Peer Review of the Biomedical Literature ◽

10.3410/f.718023265.793479377 ◽

2013 ◽

Author(s):

David Brockwell

Keyword(s):

Acid Resistance

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The study of rod-shaped TiO2 composite material in the protection of stone cultural relics

Green Processing and Synthesis ◽

10.1515/gps-2020-0034 ◽

2020 ◽

Vol 9 (1) ◽

pp. 359-365

Author(s):

Hui Shu ◽

Yujian Song ◽

Qiang Liu ◽

Maobin Luo

Keyword(s):

Photocatalytic Performance ◽

Acid Resistance ◽

Uv Resistance ◽

X Ray Diffraction ◽

X Ray ◽

Structure And Morphology ◽

Excellent Photocatalytic Activity ◽

Stone Culture ◽

Weather Resistance ◽

Cultural Relics

AbstractTiO2 has many advantages, such as UV resistance, thermal stability, and antibacterial; the attention toward TiO2 composite materials (TCMs) is rapidly increasing in the protection of stone culture relics. An innovative rod-shaped TCM was synthesized in this study. The structure and morphology of TCM were studied by X-ray diffraction and scanning electron microscopy. The acid resistance, weather resistance, hydrophilicity, and photocatalytic performance of TCM had been investigated. The experimental results indicated that TCM has good protection effects. The stone sample treated with TCM has stronger acid resistance and weather resistance, better hydrophilicity, and more excellent photocatalytic activity compared with the untreated stone. More importantly, the stone treated with TCM has better acid resistance and weather resistance than that treated with normal shaped TiO2 materials of the previous study. This work describes an effective way to protect stone cultural relics.

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Lif Deficiency Leads to Iron Transportation Dysfunction in Ameloblasts

Journal of Dental Research ◽

10.1177/00220345211011986 ◽

2021 ◽

pp. 002203452110119

Author(s):

L. Fan ◽

Y.J. Ou ◽

Y.X. Zhu ◽

Y.D. Liang ◽

Y. Zhou ◽

...

Keyword(s):

Tooth Development ◽

Iron Status ◽

Acid Resistance ◽

Blue Staining ◽

Maturation Stage ◽

Wild Type ◽

Stat3 Signaling ◽

Stat3 Signaling Pathway ◽

Stem Cell Pluripotency ◽

Underlying Mechanisms

Leukemia inhibitory factor (LIF), a member of the interleukin 6 family of cytokines, is involved in skeletal metabolism, blastocyst implantation, and stem cell pluripotency maintenance. However, the role of LIF in tooth development needs to be elucidated. The aim of the present study was to investigate the effect of Lif deficiency on tooth development and to elucidate the functions of Lif during tooth development and the underlying mechanisms. First, it was found that the incisors of Lif-knockout mice had a much whiter color than those of wild-type mice. Although there were no structural abnormalities or defective mineralization according to scanning electronic microscopy and computed tomography analysis, 3-dimensional images showed that the length of incisors was shorter in Lif−/− mice. Microhardness and acid resistance assays showed that the hardness and acid resistance of the enamel surface of Lif−/− mice were decreased compared to those of wild-type mice. In Lif−/− mice, whose general iron status was comparable to that of the control mice, the iron content of the incisors was significantly reduced, as confirmed by energy-dispersive X-ray spectroscopy (EDS) and Prussian blue staining. Histological staining showed that the cell length of maturation-stage ameloblasts was shorter in Lif−/− mice. Likewise, decreased expression of Tfrc and Slc40a1, both of which are crucial proteins for iron transportation, was observed in Lif−/− mice and Lif-knockdown ameloblast lineage cell lines, according to quantitative reverse transcription polymerase chain reaction, immunohistochemistry, and Western blot. Moreover, the upregulation of Tfrc and Slc40a1 induced by Lif stimulation was blocked by Stattic, a signal transducer and activator of transcription 3 (Stat3) signaling inhibitor. These results suggest that Lif deficiency inhibits iron transportation in the maturation-stage ameloblasts, and Lif modulates expression of Tfrc and Slc40a1 through the Stat3 signaling pathway during enamel development.

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The metabolic profile of Bifidobacterium dentium reflects its status as a human gut commensal

BMC Microbiology ◽

10.1186/s12866-021-02166-6 ◽

2021 ◽

Vol 21 (1) ◽

Author(s):

Melinda A. Engevik ◽

Heather A. Danhof ◽

Anne Hall ◽

Kristen A. Engevik ◽

Thomas D. Horvath ◽

...

Keyword(s):

Gastrointestinal Tract ◽

Metabolic Pathways ◽

Glycosyl Hydrolase ◽

Acid Resistance ◽

Human Gut ◽

Nutrient Sources ◽

Metabolic Plasticity ◽

Defined Media ◽

High Viability ◽

Ph Range

Abstract Background Bifidobacteria are commensal microbes of the mammalian gastrointestinal tract. In this study, we aimed to identify the intestinal colonization mechanisms and key metabolic pathways implemented by Bifidobacterium dentium. Results B. dentium displayed acid resistance, with high viability over a pH range from 4 to 7; findings that correlated to the expression of Na+/H+ antiporters within the B. dentium genome. B. dentium was found to adhere to human MUC2+ mucus and harbor mucin-binding proteins. Using microbial phenotyping microarrays and fully-defined media, we demonstrated that in the absence of glucose, B. dentium could metabolize a variety of nutrient sources. Many of these nutrient sources were plant-based, suggesting that B. dentium can consume dietary substances. In contrast to other bifidobacteria, B. dentium was largely unable to grow on compounds found in human mucus; a finding that was supported by its glycosyl hydrolase (GH) profile. Of the proteins identified in B. dentium by proteomic analysis, a large cohort of proteins were associated with diverse metabolic pathways, indicating metabolic plasticity which supports colonization of the dynamic gastrointestinal environment. Conclusions Taken together, we conclude that B. dentium is well adapted for commensalism in the gastrointestinal tract.

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