scholarly journals Evaluasi morfologi permukaan semen ionomer kaca dengan modifikasi penambahan nanokitosan kumbang tanduk Surface morphology evaluation of glass ionomer cement modified with nano chitosan of rhinoceros beetle

2021 ◽  
Vol 33 (3) ◽  
pp. 240
Author(s):  
Deviyanti Pratiwi ◽  
Richentya Feiby Salim ◽  
Rosalina Tjandrawinata ◽  
Komariah Komariah
Keyword(s):  
Electron Microscopy ◽  
Mechanical Properties ◽  
Scanning Electron Microscopy ◽  
Surface Morphology ◽  
Glass Ionomer Cement ◽  
Glass Ionomer ◽  
Purposive Sampling ◽  
Rhinoceros Beetle ◽  
Ionomer Cement ◽  
Scanning Electron

Pendahuluan: Penambahan nanokitosan pada modifikasi bahan restorasi kedokteran gigi bertujuan untuk memperbaiki sifat mekanik. Sifat mekanik dari suatu bahan dipengaruhi oleh struktur permukaannya. Bahan restorasi yang banyak dilakukan modifikasi yaitu Semen Ionomer Kaca (SIK), salah satunya dengan menambahkan nanokitosan. Sumber nanokitosan dapat berasal dari eksoskeleton serangga kumbang tanduk (Xylotrupes gideon). Xylotrupes gideon memiliki kandungan kitin sebesar 47%. Penelitian ini bertujuan untuk menganalisis morfologi permukaan semen ionomer kaca dengan modifikasi penambahan nanokitosan kumang tanduk. Metode: Jenis penelitian yaitu eksperimental laboratorium. Sampel berbentuk silindris dengan ukuran 6 mm (tinggi) × 4 mm (diameter). Pengambilan sampel menggunakan teknik purposive sampling. Jumlah sampel minimal sebanyak 1 sampel untuk setiap kelompok yaitu kelompok (A) SIK konvensional (kontrol), (B) SIK modifikasi 10% vol/vol larutan nanokitosan, (C) SIK modifikasi 5% vol/vol larutan nanokitosan, (D) SIK modifikasi 10% weight/weight bubuk nanokitosan, dan (E) SIK modifikasi 5% weight/weight bubuk nanokitosan. Sampel yang telah dibuat disimpan dalam inkubator dengan suhu 37°C. Karakterisasi morfologi permukaan sampel menggunakan Scanning Electron Microscopy (SEM). Hasil: Karakterisasi SEM menunjukkan adanya variasi retakan pada permukaan sampel yang diperiksa dengan pembesaran 2000× dan 3500×. SIK modifikasi bubuk nanokitosan menunjukkan lebih banyak retakan pada permukaannya serta peningkatan rasio nanokitosan kumbang tanduk menunjukkan peningkatan keretakan pada morfologi permukaan SIK. Simpulan: Penambahan nanokitosan kumbang tanduk (Xylotrupes gideon) pada Semen Ionomer Kaca  mengakibatkan perubahan morfologi permukaan SIK.Kata kunci: Semen ionomer kaca; kumbang tanduk; scanning electron microscopy ABSTRACTIntroduction: The addition of nanochitosan to the modification of dental restorative materials improves mechanical properties. Its surface structure influences the mechanical properties of a material. The restoration material that has been modified a lot is Glass Ionomer Cement (GIC), one of which is by adding nano chitosan. The source of nano chitosan can be derived from the exoskeleton of the rhinoceros beetle (Xylotrupes gideon). Rhinoceros beetle has a chitin content of 47%. This study aims to analyse the surface morphology of the glass ionomer cement with the modification of the addition of nano chitosan of rhinoceros beetle. Methods: This type of research was an experimental laboratory. The sample was cylindrical with 6 mm (height) × 4 mm (diameter). The sampling used was a purposive sampling technique. The minimum number of samples was one sample for each group, namely group (A) conventional (control) GIC, (B) modified GIC 10% vol/vol nanochitosan solution, (C) GIC modified 5% vol/vol nanochitosan solution, (D) GIC modification of 10% weight/weight of nanochitosan powder, and (E) modified GIC of 5% weight/weight of nanochitosan powder. Samples that have been made were stored in an incubator at 37°C. Characterisation of the surface morphology of the sample using Scanning Electron Microscopy (SEM). Results: SEM characterisation showed variations of cracks on the surface of the samples examined at 2000x and 3500x magnification. GIC modified nano chitosan powder showed more cracks on the surface, and an increase in the ratio of rhinoceros beetle nano chitosan showed an increase in cracks in the surface morphology of the GIC. Conclusions: The addition of nano chitosan of rhinoceros beetle to the GIC resulted in changes in the surface morphology.Keywords: Glass ionomer cement; rhinoceros beetle; scanning electron microscopy

Microbial Growth on the Surfaces of Various Orthodontic Bonding Cements

1994 ◽  
Vol 21 (2) ◽  
pp. 125-132 ◽  
Author(s):  
R. E. Blunden ◽  
R. G. Oliver ◽  
C. O'Kane
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Weight Gain ◽  
Microbial Growth ◽  
Glass Ionomer Cement ◽  
Glass Ionomer ◽  
Moderate Correlation ◽  
Orthodontic Bonding ◽  
Ionomer Cement ◽  
Scanning Electron

An experimental technique was developed to examine the adhesion of a strain of Streptococcus mutans to the surface of discs of selected orthodontic bonding composites and a glass ionomer cement. Colonization by the bacterium was assessed by weight gain and scanning electron microscopy. Initial colonization occurred after about 3 days, and the specimens were usually completely covered by the fourth day. There were statistically significant differences between materials for weight gain, a strong correlation between weight gain and surface free energy of the materials measured as droplet contact angle (r = −0·9) and a moderate correlation between weight gain and surface roughness (r = 0·6).

scholarly journals The Comparison of Biofilm Formation, Mechanical and Chemical Properties between Glass Ionomer Cement and Giomer

2021 ◽  
Vol 15 (1) ◽  
pp. 274-283
Author(s):  
Sylva Dinie Alinda ◽  
Anggraini Margono ◽  
Aditya Wisnu Putranto ◽  
Ike Dwi Maharti ◽  
Retno Amalina ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Compressive Strength ◽  
Surface Morphology ◽  
Biofilm Formation ◽  
Chemical Elements ◽  
Glass Ionomer Cement ◽  
Antibacterial Properties ◽  
Bacterial Biofilm ◽  
Glass Ionomer ◽  
Ionomer Cement

Aims: The aim of this study was to compare compressive strength and its correlation with the surface morphology and chemical elements of GIC and Giomer, as well as to determine the fluoride amount effect on the bacterial biofilm formation of GIC and Giomer. Background: The liability of Glass Ionomer Cement (GIC) mechanical properties is overcome with better antibacterial properties among restorative materials. Another fluoride-releasing restorative material, such as Giomer, has been discovered and is expected to overcome the issues with GIC’s mechanical properties; however, no research has been conducted related to antibacterial properties in Giomer. Objective: To compare compressive strength and its correlation with the surface morphology and chemical elements, then determine the fluoride amount effect on the bacterial biofilm formation of GIC and Giomer. Methods: Sixteen specimens of GIC and Giomer were prepared for a compressive strength measurement with the Universal Testing Machine. Sixteen specimens of GIC and Giomer were incubated for three days with the Streptococcus mutans culture at 37°C. The bacterial colonization was calculated using the Colony Forming Unit (CFU) and bacterial adhesion was calculated using a Scanning Electron Microscope (SEM). The mechanical properties’ compressive strength measurement, surface morphology, and chemical elements analyses were performed using SEM-EDX. Results: The compressive strength of Giomer was higher than GIC (P=0.001). The higher compressive strength of Giomer was reflected by a predominant regular surface, fewer voids, smaller and denser particles, and a higher content of silica and carbon. The bacterial biofilm on the surface of Giomer was higher than GIC, although there was no significant difference. GIC and Giomer have identical chemical elements: C, O, F, Na, Al, Si, P, and Ca. Conclusion: The compressive strength of Giomer is better than GIC; however, the biofilm formation of Giomer is higher than GIC, whereas GIC has a higher fluoride content but inferior in surfaces morphology characteristic

scholarly journals Chemical and Structural Characterization of Glass Ionomer Cements indicated for Atraumatic Restorative Treatment

2015 ◽  
Vol 16 (1) ◽  
pp. 61-67 ◽  
Author(s):  
Alvaro Henrique Borges ◽  
Matheus Coelho Bandéca ◽  
Orlando Aguirre Guedes ◽  
Mariana Kyosen Nakatani ◽  
Cyntia Rodrigues de Araújo Estrela ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Surface Morphology ◽  
Atraumatic Restorative Treatment ◽  
Glass Ionomer Cements ◽  
Glass Ionomer ◽  
Restorative Treatment ◽  
Chemical Constitution ◽  
Scanning Electron

ABSTRACT Glass ionomer cements (GICs) are restorative materials, which clinical use has increased significantly during the last decade. The aim of the present study was to analyze the chemical constitution and surface morphology of four glass ionomer cements: Maxxion R, VitroFill, Vidrion R and Vitremer. Twelve polyethylene tubes with an internal diameter of 3 and 3 mm in length were prepared, filled and then transferred to a chamber with 95% relative humidity and a temperature of 37°C. The surface morphology of the tested materials was examined by scanning electron microscopy (SEM) and main components were investigated by energy-dispersive X-ray microanalysis (EDX). Scanning electron microscopy revealed irregular and rough external surface. Cracking was not observed. The main constituents were found to be aluminum, silicon, calcium, sodium and fluoride. Phosphorus, sulfur and barium were only observed in Vidrion R, while chlorine were only observed in Maxxion R. Elemental mapping of the outer surface revealed high concentration of aluminum and silicon. Significant irregularities on the surface of the tested materials were observed. The chemical constitution of all GIC was similar. How to cite this article Guedes OA, Borges ÁH, Bandeca MC, Nakatani MK, de Araújo Estrela CR, de Alencar AHG, Estrela C. Chemical and Structural Characterization of Glass Ionomer Cements indicated for Atraumatic Restorative Treatment. J Contemp Dent Pract 2015;16(1):61-67.

Electron Microscopic Observation of the Longitudinal Organization of Poly (p-Phenylene Terephthalamide) Fibers

1982 ◽  
Vol 40 ◽  
pp. 680-681
Author(s):  
Li Li-Sheng ◽  
L.F. Allard ◽  
W.C. Bigelow
Keyword(s):  
Electron Microscopy ◽  
Mechanical Properties ◽  
Scanning Electron Microscopy ◽  
Microscopic Observation ◽  
Electron Microscopic Observation ◽  
Electron Microscopic ◽  
Aromatic Polyamides ◽  
Radial Arrangement ◽  
Scanning Electron ◽  
Better Than

The aromatic polyamides form a class of fibers having mechanical properties which are much better than those of aliphatic polyamides. Currently, the accepted morphology of these fibers as proposed by M.G. Dobb, et al. is a radial arrangement of pleated sheets, with the plane of the pleats parallel to the axis of the fiber. We have recently obtained evidence which supports a different morphology of this type of fiber, using ultramicrotomy and ion-thinning techniques to prepare specimens for transmission and scanning electron microscopy.

Comparative Evaluation of Mechanical Properties of Ceramic Reinforced Glass Ionomer Cement and Type IX GIC:An Invitro Study

2019 ◽  
Vol 10 (12) ◽  
pp. 35
Author(s):  
Nagalakshmi Chowdhary ◽  
N. K. Kiran ◽  
A. Lakshmi Priya ◽  
Rajashekar Reddy ◽  
Arvind Sridhara ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Comparative Evaluation ◽  
Glass Ionomer Cement ◽  
Glass Ionomer ◽  
Ionomer Cement

Isolasi Dan Karakterisasi Bentonit Alam Menjadi Nanopartikel Monmorillonit

2018 ◽  
Vol 3 (1) ◽  
pp. 12 ◽  
Author(s):  
Zaimahwati Zaimahwati ◽  
Yuniati Yuniati ◽  
Ramzi Jalal ◽  
Syahman Zhafiri ◽  
Yuli Yetri
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Particle Size ◽  
Surface Morphology ◽  
Average Diameter ◽  
Particle Size Analyzer ◽  
Ft Ir ◽  
Scanning Electron ◽  
Sedimentation Processes

<p>Pada penelitian ini telah dilakukan isolasi dan karakterisasi bentonit alam menjadi nanopartikel montmorillonit. Bentonit alam yang digunakan diambil dari desa Blangdalam, Kecamatan Nisam Kabupaten Aceh Utara.  Proses isolasi meliputi proses pelarutan dengan aquades, ultrasonic dan proses sedimentasi. Untuk mengetahui karakterisasi montmorillonit dilakukan uji FT-IR, X-RD dan uji morfologi permukaan dengan Scanning Electron Microscopy (SEM). Partikel size analyzer untuk menganalisis dan menentukan ukuran nanopartikel dari isolasi bentonit alam. Dari hasil penelitian didapat ukuran nanopartikel montmorillonit hasil isolasi dari bentonit alam diperoleh berdiameter rata-rata 82,15 nm.</p><p><em>In this research we have isolated and characterized natural bentonite into montmorillonite nanoparticles. Natural bentonite used was taken from Blangdalam village, Nisam sub-district, North Aceh district. The isolation process includes dissolving process with aquades, ultrasonic and sedimentation processes.  The characterization of montmorillonite, FT-IR, X-RD and surface morphology test by Scanning Electron Microscopy (SEM). Particle size analyzer to analyze and determine the size of nanoparticles from natural bentonite insulation. From the research results obtained the size of montmorillonite nanoparticles isolated from natural bentonite obtained an average diameter of 82.15 nm.</em></p>

scholarly journals Analysis of PLA Composite Filaments Reinforced with Lignin and Polymerised-Lignin-Treated NFC

Polymers ◽  
2021 ◽  
Vol 13 (13) ◽  
pp. 2174
Author(s):  
Diana Gregor-Svetec ◽  
Mirjam Leskovšek ◽  
Blaž Leskovar ◽  
Urška Stanković Elesini ◽  
Urška Vrabič-Brodnjak
Keyword(s):  
Electron Microscopy ◽  
Mechanical Properties ◽  
Scanning Electron Microscopy ◽  
Tensile Strength ◽  
Glassy State ◽  
Nanofibrillated Cellulose ◽  
Dynamic Mechanical Properties ◽  
Initial Modulus ◽  
Surface Modified ◽  
Scanning Electron

Polylactic acid (PLA) is one of the most suitable materials for 3D printing. Blending with nanoparticles improves some of its properties, broadening its application possibilities. The article presents a study of composite PLA matrix filaments with added unmodified and lignin/polymerised lignin surface-modified nanofibrillated cellulose (NFC). The influence of untreated and surface-modified NFC on morphological, mechanical, technological, infrared spectroscopic, and dynamic mechanical properties was evaluated for different groups of samples. As determined by the stereo and scanning electron microscopy, the unmodified and surface-modified NFCs with lignin and polymerised lignin were present in the form of plate-shaped agglomerates. The addition of NFC slightly reduced the filaments’ tensile strength, stretchability, and ability to absorb energy, while in contrast, the initial modulus slightly improved. By adding NFC to the PLA matrix, the bending storage modulus (E’) decreased slightly at lower temperatures, especially in the PLA samples with 3 wt% and 5 wt% NFC. When NFC was modified with lignin and polymerised lignin, an increase in E’ was noticed, especially in the glassy state.

scholarly journals Corrosion Behavior and Mechanical Properties of a Nanocomposite Superhydrophobic Coating

Coatings ◽  
2021 ◽  
Vol 11 (6) ◽  
pp. 652
Author(s):  
Divine Sebastian ◽  
Chun-Wei Yao ◽  
Lutfun Nipa ◽  
Ian Lian ◽  
Gary Twu
Keyword(s):  
Electron Microscopy ◽  
Mechanical Properties ◽  
Scanning Electron Microscopy ◽  
Atomic Force Microscopy ◽  
Nanocomposite Coating ◽  
Superhydrophobic Coating ◽  
Force Microscopy ◽  
Atomic Force ◽  
Microscopy Images ◽  
Scanning Electron

In this work, a mechanically durable anticorrosion superhydrophobic coating is developed using a nanocomposite coating solution composed of silica nanoparticles and epoxy resin. The nanocomposite coating developed was tested for its superhydrophobic behavior using goniometry; surface morphology using scanning electron microscopy and atomic force microscopy; elemental composition using energy dispersive X-ray spectroscopy; corrosion resistance using atomic force microscopy; and potentiodynamic polarization measurements. The nanocomposite coating possesses hierarchical micro/nanostructures, according to the scanning electron microscopy images, and the presence of such structures was further confirmed by the atomic force microscopy images. The developed nanocomposite coating was found to be highly superhydrophobic as well as corrosion resistant, according to the results from static contact angle measurement and potentiodynamic polarization measurement, respectively. The abrasion resistance and mechanical durability of the nanocomposite coating were studied by abrasion tests, and the mechanical properties such as reduced modulus and Berkovich hardness were evaluated with the aid of nanoindentation tests.

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