scholarly journals Effect of packaged strawberry juice on the surface roughness of nanofilled type composite resin

2013 ◽  
Vol 25 (3) ◽  
Author(s):  
Rizky Amelia ◽  
Opik Taofik Hidayat ◽  
Denny Nurdin
Keyword(s):  
Acid Treatment ◽  
Composite Resin ◽  
Tooth Enamel ◽  
Heat Exposure ◽  
Strong Acid ◽  
Microscopic Structure ◽  
Hard Tissue ◽  
Micro Cracks ◽  
The Subject ◽  
Type Composite

Introduction: The hard tissue of the teeth is resistant to heat and acid,  so that the teeth have an important role as a material consideration of forensic dentistry. The humans have the same shape of the teeth around one in two billion. The stimuli of burn with high temperature and sour can be change the picture of macroscopic and microscopic tooth. This is the subject of an interesting comparison in the interests of justice and identification of dentistry. Methods: This research was a quasi experiment to know a change of microscopic teeth on the hard cases tooth-burning and the case hard acid treatment. The sample used were seven teeth, with details of one normal as a comparison, three teeth burned and three teeth soaked in a solution of water of accu. Observations were made using the microscope at 40x enlarged on each tooth. The tooth was documented by means of a photographed and compared with healthy teeth. Results: The results of this study was obtained by observing and comparing the microscopic structure and the obtained differences in the teeth and treated with the picture of normal teeth. Conclusion: Conclusion of this research is on the tooth are burned was visible loss of enamel at the cement-enamel junction as a result of the process of carbonization heat exposure so as to cause a breach of micro on the outer layer of the tooth enamel and thinning of dentin tubules, while the teeth are in the soak water accu (strong acid) seen change in color of enamel, micro cracks due to defective enamel and depletion of tubulus dentine and loss of boundary between the cementum and dentine.

scholarly journals Microscopic appearance of healthy teeth, burned-tooth and automobile battery solution soaked tooth for the importance of visum in forensic dentistry

2013 ◽  
Vol 25 (3) ◽  
Author(s):  
Randy Rozano ◽  
Murnisari Dardjan ◽  
Fahmi Oscandar
Keyword(s):  
Tooth Enamel ◽  
Heat Exposure ◽  
Strong Acid ◽  
Microscopic Structure ◽  
Forensic Dentistry ◽  
Hard Tissue ◽  
Microscopic Appearance ◽  
Micro Cracks ◽  
The Subject ◽  
Dentin Tubules

Introduction: The hard tissue of the teeth is resistant to heat and acid,  so that the teeth have an important role as a material consideration of forensic dentistry. The humans have the same shape of the teeth around one in two billion. The stimuli of burn with high temperature and sour can be change the picture of macroscopic and microscopic tooth. This is the subject of an interesting comparison in the interests of justice and identification of dentistry. Methods: This research was a quasi experiment to analyzed change of microscopic teeth on the hard cases tooth-burning and the case hard acid treatment.The sample used were seven teeth, with details of one normal as a comparison, three teeth burned and three teeth soaked in a solution of water of accu.. Observations were made using the microscope at 40x enlarged on each tooth. The tooth was documented by means of a photographed and compared with healthy teeth. Observing and comparing the microscopic structure and the obtained differences in the teeth and treated with the picture of normal teeth. Results: The results of this study was obtained by observing and comparing the microscopic structure and the obtaineddifferences in the teeth and treated with the picture of normal teeth. Conclusion: The tooth are burned was visible loss of enamel at the cement-enamel junction as a result of the process of carbonization heat exposure so as to cause a breach of micro on the outer layer of the tooth enamel and thinning of dentin tubules, while the teeth are in the soak water accu (strong acid) seen change in color of enamel, micro cracks due to defective enamel and depletion of tubulus dentine and loss of boundary between the cementum and dentine.

scholarly journals Direct composite restoration of permanent anterior teeth uncomplicated crown fractures

2012 ◽  
Vol 24 (1) ◽  
Author(s):  
Ashley Evans Nicholas ◽  
Milly Armilia Andang ◽  
Opik Taofik Hidayat
Keyword(s):  
Composite Resin ◽  
Tooth Enamel ◽  
Literature Study ◽  
Traumatic Injuries ◽  
Anterior Teeth ◽  
Direct Restoration ◽  
Composite Resin Restoration ◽  
Dental Injuries ◽  
Sports Activities ◽  
Composite Restoration

An uncomplicated crown fracture is a fracture that involves only the tooth enamel or the dentin and tooth enamel without any damage or exposure to the pulp. Crown fracture of the anterior teeth usually caused by traumatic forces such as falls, accidents, violence, or sports activities. Traumatic injuries of the oral region frequently involve the anterior teeth, especially maxillary incisors due to the anatomic factors which may affect the functional and aesthetical values of the teeth. The objective of this literature study was to know more about uncomplicated crown fracture of the anterior teeth and its restoration. This research was a literature study performed by researching, highlighting various interesting facts and compiling the relevant published journals. The most common and ideal direct restoration of the anterior teeth was the composite resin restoration. The anterior teeth restoration was considered to be a complex and challenging case to solves due to the fact that besides reconstructing the tooth and regaining the function, the aesthetical aspect was also becoming the main objectives. The permanent anterior teeth uncomplicated crown fracture was the most common case of tooth fractures which was mainly caused by traumatic injuries such as falls, accidents, excessive forces, violence, and also sports activities. Dental injuries of the anterior teeth also affected the aesthetical properties and the function of the tooth. Composite resin restoration was able to performed directly on the permanent anterior teeth uncomplicated crown fracture.

Oxidation of CVD Growth Single-Layer Graphene

2013 ◽  
Vol 790 ◽  
pp. 7-10 ◽  
Author(s):  
Hui Gao ◽  
Yin Zhang
Keyword(s):  
Vapor Deposition ◽  
Acid Treatment ◽  
Oxidation Process ◽  
Single Layer ◽  
Chemical Vapor ◽  
Strong Acid ◽  
Single Layer Graphene ◽  
Layer Graphene ◽  
Potential Applications ◽  
Cvd Growth

Recently, oxidized chemical vapor deposition (CVD) growth graphene has drawn much attention due to its potential applications in the field of optoelectronics. In this article, we report a simple, scalable and efficient method to synthesize oxidized CVD growth single-layer graphene by the strong acid treatment. The results indicate that oxidation process successfully introduced more defects and oxygen-containing groups into the lattice of graphene.

scholarly journals XXIII. On the microscopic structure of the scales and dermal teeth of some ganoid and placoid fish

1849 ◽  
Vol 139 ◽  
pp. 435-475 ◽  
Keyword(s):  
Early Period ◽  
The Other ◽  
Careful Examination ◽  
Microscopic Structure ◽  
Important Group ◽  
The Subject ◽  
Concentric Circles ◽  
Section Transversale

At an early period after the invention of the microscope, the structure of the scales of fish attracted the notice of observers. At that time, little was known respecting the important group to which M. Agassiz has since applied the term "Ganoid;” their attention was consequently directed to the other subdivisions, and especially to the "Cycloid” forms; the object aimed at being to account for the concentric circles on the surface of the scale, which had been noticed by Barellus in 1656. Hooke touches upon them in his ʻMicographia,’ published in 1667. Five years later, the accurate Leeuwenhoek submitted them to a careful examination, and concluded, according to M. Mandl, “Qu’il se forme chaque année, une nouvelle écaille au dessous de l’ancienne, qui la déborde, de sort que l’on aperçoit sur l’écaille le bord de l’ancienne écaille, et qu’on peut ainsi en comptant dans une section transversale le nombre des couches, déterminer I’âge du poisson et le nombre d’écailles accessoires, qui forment l’écaille entière.” During a century subsequent to this discovery, but little new light appears to have been thrown upon the subject; and though Mandl, in the memoir just quoted, cites the names of Reaumur, Roberg, Petit, Schæffer, Baster, Ledermuller and Brousonnet, as having directed their attention to it, they appear to have left it pretty much where they found it.

scholarly journals Methylated Fatty Acids from Heartwood and Bark of Pinus sylvestris, Abies alba, Picea abies, and Larix decidua: Effect of Strong Acid Treatment

BioResources ◽  
2015 ◽  
Vol 10 (4) ◽  
Author(s):  
Mohamed Zidan Mohamed Salem ◽  
Ramadan A. Nasser ◽  
Aleš Zeidler ◽  
Hosam O. Elansary ◽  
Ibrahim M. Aref ◽  
...  
Keyword(s):  
Fatty Acids ◽  
Picea Abies ◽  
Pinus Sylvestris ◽  
Acid Treatment ◽  
Abies Alba ◽  
Strong Acid ◽  
Larix Decidua

scholarly journals I.—On “Tasmanite” and Australian “White Coal”

1875 ◽  
Vol 2 (8) ◽  
pp. 337-342 ◽  
Author(s):  
E. T. Newton
Keyword(s):  
New South ◽  
Microscopic Structure ◽  
Present Communication ◽  
The North ◽  
North Side ◽  
South Wales ◽  
Small Seed ◽  
Bituminous Shale ◽  
Satisfactory Account ◽  
The Subject

The two substances known as “Tasmanite” and Australian “White Coal,” which are the subject of the present communication, have a special interest for the geologist on account of the light which they throw upon the microscopio structure and composition of many Coals. My attention was first directed to them when collecting materials for Professor Huxley’s examination into the microscopic structure of Coal. My esteemed colleague, Mr. Etheridge, at that time gave me a specimen of brown laminated substance, labelled “Lignite, the so-called White Coal, Australia,” and drew my attention to the fact that it was very largely composed of small seed-like bodies, very similar to, although smaller than, the macrospores of Flemingites, which are to be seen in many kinds of British Coal. A specimen of this same kind of White Coal is in the Museum of Practical Geology, and is labelled, “ Bituminous Shale (locally called White Coal), New South Wales, Australia.” I have likewise been able to examine the specimen of Tasmanite also in this Museum, which is labelled “ Tasmanite; combustible matter from the river Mersey on the north side of Tasmania; stratum of unknown thickness, but known to extend for some miles. Presented by Sir Won. Denison.” These specimens are very similar in appearance and structure, but the White Coal is softer than the Tasmanite. Chemical analyses of Tasmanite have been published, but I am not aware of any satisfactory account of ’its microscopic structure. The only mention of Australian White Coal with which I am acquainted is that in Prof. Huxley’s lecture on “On the Formation of Coal” (“Contemporary Keview,” Nov. 1870). And there is a figure, of a section and some separated spores, given by Sir C Lyell in the 2nd edition of his Student’s Elements of Geology, 1874.

Effect of Bleaching Agents on the Nanohardness of Tooth Enamel, Composite Resin, and the Tooth-Restoration Interface

2016 ◽  
Vol 41 (1) ◽  
pp. 44-52 ◽  
Author(s):  
AT Abe ◽  
MN Youssef ◽  
ML Turbino
Keyword(s):  
Composite Resin ◽  
Ph Value ◽  
Tooth Enamel ◽  
Artificial Saliva ◽  
Statistical Tests ◽  
Sem Analysis ◽  
Bleaching Agent ◽  
Hybrid Layer ◽  
Bleaching Procedure ◽  
Etch And Rinse

SUMMARY This in vitro study aimed to evaluate the nanohardness of tooth enamel, composite resin, dental adhesive, and enamel hybrid layer exposed to 35% hydrogen peroxide-based bleaching agents and analyze the tooth-restoration interface using scanning electron microscopy (SEM). This study used 40 crowns of bovine incisors, which were embedded in epoxy resin. A 2 × 2 × 2-mm cavity was prepared in the medial third of the flattened buccal surface of each tooth and restored (two-step etch-and-rinse Adper Single Bond 2 + nanocomposite resin Filtek Z350 XT). The specimens were polished and divided into four groups (n=10), corresponding to each bleaching agent used (TB: Total Blanc Office, pH=7.22–6.33; HPB: Whiteness HP Blue, pH=8.89–8.85; HP: Whiteness HP, pH=6.65–6.04; PO: Pola Office, pH=3.56–3.8), applied in accordance with manufacturer protocols. The nanohardness of the substrates was measured before and immediately after the bleaching procedure and after 7-day storage in artificial saliva with an Ultra-Microhardness Tester (DUH-211S, Shimadzu). Loads used were 100 mN for tooth enamel and composite resin and 10 mN for adhesive and enamel hybrid layer. For SEM analysis, epoxy replicas were prepared through high-precision impressions of the specimens. For nanohardness, the statistical tests two-way analysis of variance and Tukey (p<0.05) revealed that the agent with the lowest pH value (PO) was the only one to decrease the nanohardness of enamel and the enamel hybrid layer immediately after its application; however, after 7-day storage in artificial saliva, the nanohardness levels of these substrates returned to their original values. SEM analysis revealed small gaps between tooth enamel and adhesive after the exposure to all bleaching agents; however, the most evident gap in the tooth-restoration interface was observed immediately after application of agent PO. No bleaching agent used changed the nanohardness of the composite resin and adhesive layer.

scholarly journals VII.—Supplement to a Chapter in the History of Meteorites

1882 ◽  
Vol 9 (9) ◽  
pp. 424-429
Author(s):  
Walter Flight
Keyword(s):  
Single Case ◽  
Microscopic Structure ◽  
Geological Society ◽  
History Of ◽  
The Subject

At the end of the year 1880, Dr. O. Hahn, of Reutlingen, a lawyer by calling, published a big work entitled Die Metcoriten (Chondrite) und ihre Organismen mit 32 Tafeln photographischer Abbildungen (1880, Tubingen: H. Laupp), by which he claimed to have shown the presence in meteoric rocks of sponges, corals, and crinoids. A statement of his views was read before a meeting of the Geological Society the same summer. Early this year Dr. D. F. Weinland published a paper in support of these views, Ueber die in Meteoriten entdeekten Thierreste. Illustrated with two woodcuts (1882, Esslingen: G. Fröhner). The question was thoroughly gone into in a scientific way by Prof. Carl Vogt, of Geneva, and the conclusions at which he arrived are contained in a paper entitled Les prétendus Organismes des Météorites, published 1882, Genéve: H. Georg. It is shown that Dr. Hahn had no foundation for his conclusions; that all the pretended organic structures are purely inorganic; and that in no single case do they present the microscopic structure of the organisms for which they have been mistaken — such as crinoids, corals, and sponges. See also Dr. Laurence Smith on the subject in the Amer. Jour. Sc. 1882, February, 156.

scholarly journals Structural and thermal characterization of different types of cellulosic fibers

BIBECHANA ◽  
2018 ◽  
Vol 16 ◽  
pp. 177-186 ◽  
Author(s):  
Jyoti Giri ◽  
Ralf Lach ◽  
Janak Sapkota ◽  
Md. Abu Bin Hasan Susan ◽  
Jean-Marc Saiter ◽  
...  
Keyword(s):  
Acid Treatment ◽  
Thermal Characterization ◽  
Strong Acid ◽  
Nanocrystalline Cellulose ◽  
Cellulosic Fibers ◽  
Chemical Treatments ◽  
Different Types ◽  
Hydrophilic Character ◽  
Primary Crystals

Micro- and nanocrystalline cellulose were extracted from wheat stalk (WS) using different thermomechanical and chemical treatments and characterized by spectroscopic, microscopic and diffraction techniques. The virgin WS fibers were found to be structurally quite similar to the commercial microcrystalline cellulose (MCC). Similar to the commercial one, the MCC extracted from the WS possessed intense infrared (IR) peaks whereas those peaks became more broader in the nanocrystalline cellulose (NCC) of the same origin, which can be attributed to possible breakdown of inter- and intramolecular H-bonding due to strong acid treatment of the MCC. Microscopic results revealed characteristic textures of the MCC and the NCC, the MCC being irregular bundles of the primary crystals bound together with the amorphous phase. The latter was found to disintegrate upon acid hydrolysis giving rise to the rod-shaped nanocrystals having much larger surface area and thus possessing more intense hydrophilic character. The MCC was found to be more stable than the NCC which can be attributed to the presence of protective and binding coating provided by the amorphous cellulosic matter.BIBECHANA 16 (2019) 177-186

scholarly journals Microtensile Bond Strength of Polyacid-modified Composite Resin to Irradiated Primary Molars

2018 ◽  
Vol 19 (2) ◽  
pp. 189-195
Author(s):  
Yucel Yilmaz ◽  
Sultan Keles ◽  
Orhan Sezen
Keyword(s):  
Bond Strength ◽  
Primary Teeth ◽  
Composite Resin ◽  
Tooth Enamel ◽  
Primary Tooth ◽  
Primary Molars ◽  
Control Group ◽  
Microtensile Bond Strength ◽  
Significant Difference ◽  
Tooth Dentin

ABSTRACT Aim This study evaluated the influence of various doses of radiotherapy on the microtensile bond strength (μTBS) of compomer resin to dentin and enamel in primary molars. Materials and methods Thirty-five intact primary molars were collected and divided into seven groups. Teeth were irradiated with doses from 10 to 60 Gy, except for the control group. Compomer restorations were performed, and enamel—compomer resin beams and dentin—compomer resin beams were tested at a crosshead speed of 1 mm/min. Results No statistically significant difference was found between the irradiated tooth enamel and the control group (F = 1.1468; p = 0.194). However, statistically significant differences were evident among the dentin groups (F = 11.050; p < 0.001). Conclusion Radiation may not cause a significant difference in the μTBS of compomer resin to primary tooth enamel, but appears to dose dependently decrease its bond strength to primary tooth dentin. Clinical significance Radiotherapy may affect the success rate of compomer fillings in primary teeth, especially in deeper cavities with exposed dentin. How to cite this article Keles S, Yilmaz Y, Sezen O. Microtensile Bond Strength of Polyacid-modified Composite Resin to Irradiated Primary Molars. J Contemp Dent Pract 2018;19(2):189-195.

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