Objective: The purpose of this study was to evaluate the acid resistance and structural changes in the enamel surface of permanent teeth after subablative Er:YAG laser irradiation in vitro.
Background Data: Er:YAG irradiation laser is expected to enhance acid resistance and to produce morphological changes on the enamel surface.
Methods: One hundred twenty samples of human enamel were divided into four groups (n = 30): Group I was the control (no laser irradiation), and Groups II, III, and IV were irradiated with Er:YAG laser at 100 mJ (12.7 J/cm(2)), 100 mJ (7.5 J/cm(2)), and 150 mJ (11 J/cm(2)), respectively, at 10 Hz and with water spray. The samples were placed in an acid solution, and the released calcium was quantified by atomic absorption spectrometry. The weight percentages of calcium, phosphorus, oxygen, and chlorine on the enamel surface were determined by energy dispersive X-ray spectroscopy. The morphological changes were observed by scanning electron microscopy. One-way ANOVA and Kruskal-Wallis tests were performed (p
Results: The weight percentage of calcium in the samples obtained from EDS and the amount of calcium in the solution did not show any significant difference. All irradiated samples showed morphological changes on the enamel surface compared to the control group.
Conclusions: The results of this study suggest that acid resistance of enamel due to subablative Er:YAG laser irradiation on the samples did not increase as expected. Morphological microscopic changes included craters and cracks on the irradiated zones.
Download full-text PDF |
Source |
|---|---|
| http://dx.doi.org/10.1089/pho.2008.2454 | DOI Listing |
Publication Analysis
Top Keywords
Similar Publications
Homogeneous and bioluminescent biochemical and cellular assay for monitoring cGAMP and enzymes that generate and degrade cGAMP.
Sci Rep
December 2024
Promega Corporation, 2800 Woods Hollow Road, Madison, WI, 53711, USA.
The cyclic GMP-AMP synthase-stimulator of the interferon gene (cGAS-STING) signaling pathway is considered an essential pattern recognition and effector pathway in the natural immune system and is mainly responsible for recognizing DNA molecules present in the cytoplasm and activating downstream signaling pathways to generate type I interferons (IFN-I) and other inflammatory factors. STING, a crucial junction protein in the innate immune system, exerts an essential role in host resistance to external pathogen invasion. The DNA introduced by pathogens or tumors is recognized by the cytoplasmic nucleic acid receptor cGAS, and a second messenger, cGAMP, is generated using intracellular guanosine triphosphate (GTP) and adenosine triphosphate (ATP).
View Article and Find Full Text PDFEvans syndrome as a presentation in systemic lupus erythematous, coexisting with Hashimoto's thyroiditis and pernicious anemia: a case report.
J Med Case Rep
December 2024
Faculty of Medicine, Al-Quds University, Jerusalem, Palestine.
Background: Evans syndrome is a rare disorder characterized by the simultaneous or sequential combination of autoimmune hemolytic anemia and immunological thrombocytopenia, together with a positive direct antiglobulin test. This syndrome, which can be primary or secondary, is a rare initial manifestation of autoimmune diseases, notably systemic lupus erythematosus, with 1.7-2.
View Article and Find Full Text PDFMetabolomic and Transcriptomic Analysis Reveals Metabolic-Immune Interactions in Choroid Neovascularization.
Exp Eye Res
December 2024
Eye Institute and Department of Ophthalmology, Eye & ENT Hospital, Fudan University, 83 Fenyang Road, Shanghai, 200031, China; Key laboratory of Myopia and Related Eye Diseases, NHC, Chinese Academy of Medical Sciences, 83 Fenyang Road, Shanghai, 200031, China; Shanghai Key Laboratory of Visual Impairment and Restoration, 83 Fenyang Road, Shanghai, 200031, China. Electronic address:
Choroid neovascularization (CNV) is a distinct type of age-related macular degeneration (AMD) with a poor prognosis and responsible for the majority of vision loss in the elderly population. The laser-induced CNV model is a well-established animal model frequently used to study CNV. In this study, we performed an integrated analysis of metabolomic and transcriptomic data from CNV samples, utilizing multiple approaches including single-sample gene set enrichment analysis (ssGSEA), correlation analysis, and weighted gene co-expression network analysis (WGCNA), alongside various bioinformatics platforms, to identify key metabolic and immune signatures and to investigate their interplay during angiogenesis.
View Article and Find Full Text PDFConstructing a green modifier by using glyoxal-urea resin and chitosan to obtain a modified soy protein adhesive with high bonding strength and excellent water resistance.
Int J Biol Macromol
December 2024
Yunnan Key Laboratory of Wood Adhesives and Glue Products, Southwest Forestry University, Kunming 650224, PR China; College of Materials and Chemical Engineering, Southwest Forestry University, Kunming 650224, PR China. Electronic address:
The manufacturing of soy-based adhesives with high bonding strength, excellent water resistance, and exceptional environmental performance still faces difficulties. In this work, using glyoxal-urea (GU) resin, chitosan (CS), and soy protein isolate (SPI) as the primary raw materials in order to effectively mitigate the release of free formaldehyde commonly found in traditional wood-based panels. Obtaining an adhesive with high strength, excellent water resistance, and a stable cross-linking structure of GU/CS/SPI (CS represents different mass fractions of chitosan solution).
View Article and Find Full Text PDFOverexpression of the constitutively-active AtCPK1 mutant in tobacco plants confers cold and heat tolerance, possibly through modulating abscisic acid and salicylic acid signalling.
J Plant Physiol
December 2024
Federal Scientific Centre of the East Asia Terrestrial Biodiversity of the Far East Branch of the Russian Academy of Sciences, Vladivostok, 690022, Russia.
Calcium-dependent protein kinases (CDPKs) are very effective calcium signal decoders due to their unique structure, which mediates substrate-specific [Ca] signalling through phosphorylation. However, Ca-dependence makes it challenging to study CDPKs. This work focused on the effects of the overexpression of native and modified forms of the AtCPK1 gene on the tolerance of tobacco plants to heat and cold.
View Article and Find Full Text PDFWant AI Summaries of new PubMed Abstracts delivered to your In-box?
Enter search terms and have AI summaries delivered each week - change queries or unsubscribe any time!