scholarly journals Improving the Properties of Dental Porcelain Luminescence Using Silicon Carbide

2020 ◽  
Vol 11 (3) ◽  
pp. 11023-11030
Keyword(s):  
Silicon Carbide ◽  
Ultraviolet Light ◽  
Control Sample ◽  
Luminescence Properties ◽  
Light Reflection ◽  
Blue Fluorescence ◽  
Dental Porcelain ◽  
Natural Teeth ◽  
Dental Restorative ◽  
Natural Tooth

An ideal dental restorative should have the same light reflection, diffusion, and fluorescence properties as a natural tooth. Natural teeth always emit intense blue fluorescence under ultraviolet light, making the teeth look whiter and brighter in daylight. One of the limitations in trying to simulate restorative materials is the unique structure of natural teeth. This study aimed to simulate dental tubules and investigate the effect of different porosity percentages on dental porcelain luminescence properties. In this laboratory study, a control sample (without silicon carbide) and three dental porcelain samples with different percentages of porosity were prepared by adding 1, 2, 3% silicon carbide luminescence intensity was examined by spectrophotometer and compared with natural teeth. An increase in luminescence properties was observed with increasing porosity. The highest light intensity was observed in the sample’s porosity with 3% silicon carbide. The lowest intensity was observed in the porosity of the sample with 1%. Creating porosity in dental porcelain reduces refraction, collision, and light reflection. Therefore such specimens will be brighter and more transparent when exposed to ultraviolet light.

Evaluation of the Effect of Ultraviolet Light Excitation during Characterization of Silicon Carbide Epitaxial Layers

2018 ◽  
Vol 924 ◽  
pp. 261-264
Author(s):  
Hrishikesh Das ◽  
Swapna Sunkari ◽  
Oener Akdik ◽  
Andrei Konstantinov ◽  
Krister Gumaelius ◽  
...  
Keyword(s):  
Silicon Carbide ◽  
Ultraviolet Light ◽  
Defect Detection ◽  
Uv Light ◽  
Surface Treatments ◽  
Uv Laser ◽  
Original State ◽  
Optimal Surface ◽  
Light Excitation

The scanning of Silicon Carbide (SiC) epitaxy wafers for defects by ultraviolet (UV) laser or lamps is widely prevalent. In this work, we document the effects of UV light excitation on the SiC epitaxy material. An increase in background photoluminescence (PL) is observed after repeated scans. The effect of this increase on defect detection is shown. Optimal surface treatments to recover the material back to the original state are demonstrated. Further, some surface treatments are proposed which reduce the effect of the UV light excitation and prevent to a large extent the rise in background PL.

scholarly journals Hard Tissue Architecture of Tooth – No Strain with Stain

2018 ◽  
Vol 3 (1) ◽  
pp. 5
Author(s):  
Nicholette Tan ◽  
A. Thentamil ◽  
Mathew Jacob
Keyword(s):  
Tissue Architecture ◽  
Hard Tissue ◽  
Apical Portion ◽  
Hard Tissues ◽  
Natural Teeth ◽  
Group 2 ◽  
Natural Tooth ◽  
Group 1

<p>One of the methods for visualizing and studying the hard tissues of the tooth is by preparation of ground sections of the desired area of the tooth. This method is relatively simple and enables us to appreciate the site and arrangement of various anatomical units of enamel, dentin and cementum. However, these sections are unstained and the features observed are based on the degree of light permeating through the sections. In this experiment, natural tooth were preserved in haematoxylin and eosin to study histological components of tooth. Twenty recently extracted natural teeth were utilized for this experiment and divided into two groups. In group 1, apical portion of the tooth were sealed and perforations were made on the different aspects of the tooth. In group 2, the apical portions of the root were flattened and the apex kept open. Both groups were preserved in haematoxylin and eosin to permit imbibition of the stain. Following which, ground sections were prepared and viewed under a microscope.</p>

scholarly journals Fluoride-Releasing Dental Restorative Materials: An Update

2014 ◽  
Vol 18 (2) ◽  
pp. 60-69 ◽  
Author(s):  
John W. Nicholson
Keyword(s):  
Glass Ionomer Cement ◽  
Composite Resins ◽  
Glass Ionomer ◽  
Acid Attack ◽  
Dental Cement ◽  
Dental Restoratives ◽  
Resin Modified Glass Ionomer ◽  
Dental Restorative ◽  
Natural Tooth ◽  
Ionomer Cement

SUMMARYThe fluoride ion has a well-established beneficial role in dentistry in protecting the teeth from assault by caries. It is known to contribute to the dynamic mineralisation process of the natural tooth mineral, and also to become incorporated with the mineral phase, forming a thin layer of fluorapatite. This is more resistant to acid attack than the native hydroxyapatite, hence protects the tooth against further decay. Other recently discovered aspects of the role and uptake of fluoride will also be discussed.One of the widely used dental restoratives, the glass-ionomer dental cement, is able to release fluoride in a sustained manner that may continue for many years, and this is seen as clinically beneficial. The closely related resin-modified glass-ionomer cement, and also the polyacid-modified composite resin (“compomer”) are able to do the same. There are also fluoride-containing conventional composite resins able to release fluoride.These various materials are reviewed and the way in which they release fluoride are described, as well as the effectiveness of the release at the levels involved. Studies of effectiveness of fluoride release from these various classes of material are reviewed, and shown to suggest that release from conventional and resin-modified glass-ionomers is more beneficial than from composite resins. This is attributed to 2 causes: firstly, that it is not possible to replace the lost fluoride in composites, unlike glass-ionomers, and secondly because the other ions released from glass-ionomers (calcium, phosphate) are able to contribute to local remineralisation of the tooth. The absence of these other ions in fluoridated composites means that remineralisation is able to occur to a lesser extent, if at all.

Splinting Osseointegrated Implants and Natural Teeth in Partially Edentulous Patients: A Systematic Review of the Literature

2012 ◽  
Vol 38 (4) ◽  
pp. 424-434 ◽  
Author(s):  
Anastasios Mamalis ◽  
Kleopatra Markopoulou ◽  
Konstatinos Kaloumenos ◽  
Antonis Analitis
Keyword(s):  
Systematic Review ◽  
Therapeutic Option ◽  
Survival Rates ◽  
Term Survival ◽  
Osseointegrated Implants ◽  
Rigid Connection ◽  
Natural Teeth ◽  
Edentulous Patients ◽  
Natural Tooth

Dental implants in partially edentulous patients are a predictable therapeutic option. In patients with reduced bone volume, tooth-to-implant connected prostheses have been described as a treatment option. In this systematic review, the incidence of biologic and technical complications and the long-term survival rates of tooth-implant supported fixed partial dentures (FPDs) are analyzed. In cases where a natural tooth is connected with an implant to support a FPD, a rigid connection should be preferred.

Surface Effects of Passivation within Mo/4H-SiC Schottky Diodes through MOS Analysis

2019 ◽  
Vol 963 ◽  
pp. 511-515
Author(s):  
A. Benjamin Renz ◽  
Vishal Ajit Shah ◽  
Oliver Vavasour ◽  
Yeganeh Bonyadi ◽  
G.W.C Baker ◽  
...  
Keyword(s):  
Silicon Carbide ◽  
Ideality Factor ◽  
Photoelectron Spectroscopy ◽  
Schottky Diodes ◽  
Control Sample ◽  
Metal Oxide Semiconductor ◽  
Oxide Semiconductor ◽  
X Ray ◽  
Schottky Rectifier ◽  
Metal Oxide Semiconductor Capacitor

Passivation treatments applied prior to Mo metallisation on Silicon Carbide (SiC) Schottky rectifier and metal-oxide-semiconductor capacitor (MOSCAP) structures are studied. A control sample and two treatments, comprising of an O2 oxidation and a phosphorus pentoxide (P2O5) deposition, were studied. Electrical characterisation results show that P2O5 treatment improves the homogeneity of the diodes, with the ideality factor reducing to 1.02 and the leakage current reducing by three orders of magnitude to 2×10-5 A/cm2. Furthermore, the SBH was lowered by 0.11 eV and the variance of all the P2O5 treated Schottky characteristics over the batch reduced. Characterisation by X-ray photoelectron spectroscopy (XPS) showed that the stoichiometry, the Si:C ratio, of the SiC below the contact increased from 0.93:1 before treatment to 0.97:1 after P2O5 treatment.

Assessment of Myeloperoxidase and Nitric Levels around Dental Implants and Natural Teeth as a Marker of Inflammation: A Comparative Study

2016 ◽  
Vol 17 (11) ◽  
pp. 934-938 ◽  
Author(s):  
Manish Kumar ◽  
Gayithri H Kulkarni ◽  
Prashant Jadhav ◽  
Kiran Kulkarni ◽  
Sachin V Shinde ◽  
...  
Keyword(s):  
Comparative Study ◽  
Dental Implants ◽  
Dental Implant ◽  
Plaque Index ◽  
Gingival Bleeding ◽  
Significant Difference ◽  
Inflammatory Processes ◽  
Natural Teeth ◽  
The Mean ◽  
Natural Tooth

ABSTRACT Introduction Dental implants form the mainstay of dental treatment involving rehabilitation of missing teeth. One of the major concerns for the clinicians doing dental implants is the postsurgical failure of dental implants. Success of dental implants is dependent upon the skills of the surgeon and the amount and quality of the bone remaining at the edentulous area where dental implant has to be placed. Myeloperoxidase (MPO) and nitrites are few of the enzymes and molecules which are said to be altered in inflammation. However, their exact role in the inflammatory processes around natural tooth and dental implant is still unclear. Hence we comparatively evaluated the levels of MPO and nitrites in the areas around the dental implants and natural teeth. Materials and methods The present study comprises 42 patients who underwent prosthetic rehabilitation by dental implants from 2011 to 2014. Depth of probing value (DP), score of plaque index (SPI), gingival index (GI), and index of gingival bleeding time (GBT) were evaluated for the assessment of the periimplant soft tissue changes. Assessment of inflammation around the dental implant surface and around natural tooth was done based on the readings of these parameters. For the measurement of the MPO levels, spectrophotometric MPO assay was used. All the results were analyzed by Statistical Package for the Social Sciences (SPSS) software. Results The mean plaque index values were 1.56 and 0.97 in periodontitis cases of natural teeth and inflamed cases of dental implants respectively. While comparing mean plaque index, mean probing depth, and mean gingival bleeding index in between the two groups, significant difference was obtained. Mean MPO concentration in periodontitis and gingivitis cases in natural teeth were 0.683 and 0.875 U/μL, while in inflamed dental implant cases, the mean value was 0.622 U/μL. While comparing the total MPO levels, total nitrite levels, and total nitrite concentration in between two study groups, significant difference was obtained. On comparing the healthy and periodontitis cases in natural teeth, significant difference was obtained. Conclusion In the inflammatory processes occurring around dental implant and natural teeth, MPO and NO make some amount of significant contribution. Clinical significance The present study enforces on the role of MPO and nitrite as diagnostic and prognostic marker. How to cite this article Kulkarni GH, Jadhav P, Kulkarni K, Shinde SV, Patil YB, Kumar M. Assessment of Myeloperoxidase and Nitric Levels around Dental Implants and Natural Teeth as a Marker of Inflammation: A Comparative Study. J Contemp Dent Pract 2016;17(11):934-938.

Milliwatt Power Deep Ultraviolet Light Emitting Diodes Grown on Silicon Carbide

2005 ◽  
Vol 44 (No. 17) ◽  
pp. L502-L504 ◽  
Author(s):  
Craig G. Moe ◽  
Hisashi Masui ◽  
Mathew C. Schmidt ◽  
Likun Shen ◽  
Brendan Moran ◽  
...  
Keyword(s):  
Silicon Carbide ◽  
Ultraviolet Light ◽  
Light Emitting Diodes ◽  
Light Emitting ◽  
Deep Ultraviolet ◽  
Ultraviolet Light Emitting Diodes

Luminescence properties of thin nanocrystalline silicon-carbide films fabricated by direct-beam ion deposition

2014 ◽  
Vol 48 (6) ◽  
pp. 711-714 ◽  
Author(s):  
I. V. Mirgorodskiy ◽  
L. A. Golovan ◽  
V. Yu. Timoshenko ◽  
A. V. Semenov ◽  
V. M. Puzikov
Keyword(s):  
Silicon Carbide ◽  
Nanocrystalline Silicon ◽  
Luminescence Properties ◽  
Direct Beam ◽  
Nanocrystalline Silicon Carbide ◽  
Ion Deposition

scholarly journals Biomimetic Aspects of Restorative Dentistry Biomaterials

Biomimetics ◽  
2020 ◽  
Vol 5 (3) ◽  
pp. 34 ◽  
Author(s):  
Muhammad Sohail Zafar ◽  
Faiza Amin ◽  
Muhmmad Amber Fareed ◽  
Hani Ghabbani ◽  
Samiya Riaz ◽  
...  
Keyword(s):  
Tissue Engineering ◽  
Restorative Dentistry ◽  
Materials Properties ◽  
Tooth Structure ◽  
Dental Tissues ◽  
Restorative Materials ◽  
Natural Teeth ◽  
Scaffold Materials ◽  
Natural Counterpart ◽  
Dental Restorative

Biomimetic has emerged as a multi-disciplinary science in several biomedical subjects in recent decades, including biomaterials and dentistry. In restorative dentistry, biomimetic approaches have been applied for a range of applications, such as restoring tooth defects using bioinspired peptides to achieve remineralization, bioactive and biomimetic biomaterials, and tissue engineering for regeneration. Advancements in the modern adhesive restorative materials, understanding of biomaterial–tissue interaction at the nano and microscale further enhanced the restorative materials’ properties (such as color, morphology, and strength) to mimic natural teeth. In addition, the tissue-engineering approaches resulted in regeneration of lost or damaged dental tissues mimicking their natural counterpart. The aim of the present article is to review various biomimetic approaches used to replace lost or damaged dental tissues using restorative biomaterials and tissue-engineering techniques. In addition, tooth structure, and various biomimetic properties of dental restorative materials and tissue-engineering scaffold materials, are discussed.

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