Influence of DSS-8 on the remineralisation of Dentine

2009 ◽  
Vol 1187 ◽  
Author(s):  
Chia-Chan Hsu ◽  
Elizabeth Marie Hagerman ◽  
Hsiu-Ying Chung ◽  
Wenyuan Shi ◽  
Jenn-Ming Yang ◽  
...  
Keyword(s):  
Elastic Modulus ◽  
Grazing Incidence ◽  
Variable Pressure ◽  
X Ray Diffraction ◽  
Tooth Remineralization ◽  
Force Microscopy ◽  
Atomic Force ◽  
Human Dentin ◽  
Tooth Surfaces

AbstractDental remineralization may be achieved by mediating the interactions between tooth surfaces with free ions and biomimetic peptides. We recently developed octuplet repeats of aspartate-serine-serine (DSS-8) peptide, which occurs in high abundance in naturally occurring proteins that are critical for tooth remineralization. In this paper, we evaluated the possible role of DSS-8 in dentin remineralization. Human dentin specimens were demineralized, exposed briefly to DSS-8 solution, and then exposed to concentrated ionic solutions that favor remineralization. Dentin nano-mechanical behaviors, hardness and elastic modulus, at various stages of treatment were determined by nanoindentation. The phase, microstructure and morphology of the resultant surfaces were characterized using grazing incidence X-ray diffraction, variable pressure scanning electron microscopy, and atomic force microscopy, respectively. Nanoindentation results show that DSS-8 remineralization effectively improves the mechanical and elastic properties of native dentin. Moreover, the hardness and elastic modulus for the DSS-8 treated dentin were significantly higher than surfaces remineralized without DSS-8.

scholarly journals Effects on Hardness and Elastic Modulus for DSS-8 Peptide Treatment on Remineralization of Human Dental Tissues

2008 ◽  
Vol 1132 ◽  
Author(s):  
Chia-Chan Hsu ◽  
Hsiu-Ying Chung ◽  
Elizabeth Marie Hagerman ◽  
Wenyuan Shi ◽  
Jenn-Ming Yang ◽  
...  
Keyword(s):  
Elastic Modulus ◽  
Grazing Incidence ◽  
Variable Pressure ◽  
Tooth Remineralization ◽  
Force Microscopy ◽  
Dental Tissues ◽  
Atomic Force ◽  
Human Enamel ◽  
Demineralized Enamel ◽  
Tooth Surfaces

ABSTRACTDental remineralization may be achieved by mediating the interactions between tooth surfaces with free ions and biomimetic peptides. We recently developed octuplet repeats of aspartate-serine-serine (DSS-8) peptide, which occurs in high abundance in naturally occurring proteins that are critical for tooth remineralization. In this paper, we evaluated the possible role of DSS-8 in enamel remineralization. Human enamel specimens were demineralized, exposed briefly to DSS-8 solution, and then exposed to concentrated ionic solutions that favor remineralization. Enamel nano-mechanical behaviors, hardness and elastic modulus, at various stages of treatment were determined by nanoindentation. The phase, microstructure and morphology of the resultant surfaces were characterized using the grazing incidence X-ray diffraction (GIXD), variable pressure scanning electron microscopy (VPSEM), and atomic force microscopy (AFM), respectively. Nanoindentation results show that the DSS-8 remineralization effectively improves the mechanical and elastic properties for demineralized enamel.

Preparation and Research on the Lateral Elastic Modulus of the MnO2 Nanowires

2013 ◽  
Vol 662 ◽  
pp. 84-87
Author(s):  
Yong Jiang ◽  
Jian Cheng Deng ◽  
Yan Huai Ding ◽  
Jiu Ren Yin ◽  
Ping Zhang
Keyword(s):  
Elastic Modulus ◽  
Crystal Form ◽  
Bending Test ◽  
X Ray Diffraction ◽  
Nanowire Diameter ◽  
X Ray ◽  
Three Point Bending ◽  
Force Microscopy ◽  
Atomic Force ◽  
Mno2 Nanowires

MnO2 nanowires with large aspect ratio were successfully synthesized via a hydrothermal method. In this method, Mn(NO3)2 was as a source of manganese and NH4NO3 as an oxidant. The structure and morphology of the MnO2 nanowires were characterized by X ray diffraction (XRD) and scanning electron microscope (SEM). Their lateral elastic modulus was characterized via a nanoscale three-point bending test by atomic force microscopy (AFM) equipped with picoforce. The results indicate that the crystal form of MnO2 was β-MnO2. The elastic modulus of the nanowires decreased with the increase in nanowire diameter. This elastic modulus was in the range of 33.36-77.84GPa as the diameter ranged from 240 to 185nm.

Studies of Hydroxyapatite Thin Coating Produced by Dual RF Magnetron Sputtering for Biomedical Applications

2011 ◽  
Vol 493-494 ◽  
pp. 473-476
Author(s):  
E.O. Lopez ◽  
F.F. Borghi ◽  
Alexandre Mello ◽  
J. Gomes ◽  
Antonella M. Rossi
Keyword(s):  
Magnetron Sputtering ◽  
Deposition Time ◽  
Grazing Incidence ◽  
Rf Magnetron Sputtering ◽  
Nanocrystalline Phase ◽  
Rf Power ◽  
X Ray Diffraction ◽  
Force Microscopy ◽  
Atomic Force ◽  
Sputtering Power

In this present work, we characterize HAp thin films deposited by dual magnetron sputtering device DMS on silicon (Si/HAp). The sputtering RF power was varied from 90 watts to 120 watts and deposition times from 60 to 180 minutes. The argon and oxygen pressure were fixed at 5.0 mTorr and 1.0 mTorr, respectively. Grazing incidence X-ray diffraction (GIXRD) from synchrotron radiation, infrared spectroscopy (FTIR) and atomic force microscopy (AFM) were used for the structural characterization. At lower deposition times, a crystalline phase with preferential orientation along apatite (002) and a disordered nanocrystalline phase were identified. The coating crystallinity was improved with the increase of the deposition time besides the sputtering power.

Effect of Sputtering Power on Structural and Optical Properties of AlN Thin Film Deposited by Reactive DC Sputtering Technique

2013 ◽  
Vol 770 ◽  
pp. 177-180 ◽  
Author(s):  
Nirun Witit-Anun ◽  
Jakrapong Kaewkhao ◽  
Surasing Chaiyakun
Keyword(s):  
Crystal Structure ◽  
Grazing Incidence ◽  
Optical Transmittance ◽  
X Ray Diffraction ◽  
Force Microscopy ◽  
Atomic Force ◽  
Sputtering Power ◽  
Envelope Method ◽  
Deposited Films ◽  
Si Wafer

Aluminum nitride (AlN) thin films have been deposited on the glass slide and Si-wafer by reactive DC magnetron sputtering technique at different sputtering power. The as-deposited films have been characterized by grazing-incidence X-ray diffraction (GIXRD), atomic force microscopy (AFM) and optical transmittance, respectively. The results show that the as-deposited films were transparent and have high transmittance in visible regions. The crystal structure from XRD results show that the as-deposited films are amorphous with low sputtering power and turn to crystal structure with high sputtering power, which showed orientation of AlN structure corresponding to the AlN(1 0 0), AlN(1 0 1) and AlN(1 1 0). The roughness values and the films thickness from AFM was varied from 0.4 nm to 3.9 nm and 199 nm to 905 nm, respectively. The optical constants namely the refractive index n and the extinction coefficient k, were determined from transmittance spectrum in the visible regions by using envelope method. For 500 nm, n and k, were in the range of 1.8 2.0 and 0.014 0.004 respectively.

Formation, Structure and Optical Properties of Nanocrystalline BaSi2 Films on Si(111) Substrate

2015 ◽  
Vol 245 ◽  
pp. 42-48 ◽  
Author(s):  
Dmitrii Vladimirovich Fomin ◽  
Victor Leonidovich Dubov ◽  
Konstantin Nickolaevich Galkin ◽  
Dmitrii L'vovich Goroshko ◽  
Andrei Mikhailovich Maslov ◽  
...  
Keyword(s):  
Solid Phase ◽  
Interband Transition ◽  
Grazing Incidence ◽  
Wave Number ◽  
X Ray Diffraction ◽  
Defect States ◽  
Force Microscopy ◽  
Atomic Force ◽  
Density Of Defect States ◽  
Anneal Temperature

BaSi2 thin films were formed on Si (111) substrate by solid-phase epitaxy (SPE) (UHV deposition) using the template technology followed by vacuum annealing at temperatures of 600 °C and 750 °C. After the deposition and annealing barium silicide films were characterized by Auger electron spectroscopy, grazing incidence x-ray diffraction (GIXRD) and atomic-force microscopy (AFM). It was established that the films annealed at T = 600 °C are polycrystalline with the structure of the orthorhombic BaSi2, with grain sizes of 100-200 nm. Higher anneal temperature (T=750 °C) leads to increase of diffraction peak intensity of BaSi2 phase with grain coagulation into 300-400 nm islands. It was confirmed that nanocrystalline BaSi2 films are characterized by a direct fundamental interband transition at 1.3 eV, the second interband transition with an energy of 2.0 eV, own phonon structure with wave number peaks at 112, 119, 146 and 208 cm-1 and a high density of defect states within the band gap, which provide a noticeable subband absorption at energies of 0.8 – 1.1 eV.

Preparation and characterization of hexamethylenediamine-modified graphene oxide/Co-polyamide nanocomposites

2019 ◽  
Vol 28 (6) ◽  
pp. 421-432
Author(s):  
Huixin Wang ◽  
Xin Liu ◽  
Zhe Yang ◽  
Haifeng He ◽  
Xiaoyu Shao ◽  
...  
Keyword(s):  
X Ray Diffraction ◽  
Amide Bonds ◽  
Force Microscopy ◽  
Solution Blending ◽  
Atomic Force ◽  
Blending Method ◽  
Modified Graphene Oxide ◽  
The Matrix ◽  
Modified Graphene

The hexamethylenediamine-modified graphite oxide/Co-polyamide (GO-HMD/CO-PA) nanocomposites were successfully produced by solution blending method. X-ray diffraction, Fourier-transform infrared spectroscopy, scanning electron microscopy, and atomic force microscopy analyses revealed that GO with a large number of oxygen-containing functional groups was successfully obtained by a modified Hummer’s method. For GO-HMD, the amino and amide bonds were introduced into the GO sheets, making the sheets more incompact, fluffy, and irregular. GO-HMD with a content of less than 1 wt% could be uniformly dispersed in the CO-PA matrix. A series of analysis indicated that the tensile strength, yield strength, and elongation at break of 0.4 wt% GO-HMD/CO-PA increased by 73.4%, 185.9%, and 42.3%, respectively. Thermogravimetric analysis showed that GO-HMD played the role of the heterogeneous nucleation in the matrix and could change the crystal type of the polyamide. The T 50% and Td , max of nanocomposites were 14.3°C and 11.8°C higher than pure polyamide, respectively. The nanofiller GO-HMD contributes to the increase of the thermal diffusivity at low temperature.

Structure and Properties of Murine and Human Dentin

2005 ◽  
Vol 874 ◽  
Author(s):  
Stefan Habelitz ◽  
Shabnam Zartoshtimanesh ◽  
Mehdi Balooch ◽  
Sally J. Marshall ◽  
Grayson W. Marshall ◽  
...  
Keyword(s):  
Atomic Force Microscopy ◽  
Elastic Modulus ◽  
Dynamic Stiffness ◽  
Model System ◽  
Structure And Properties ◽  
Force Microscopy ◽  
Dental Tissues ◽  
Atomic Force ◽  
Main Structural Feature ◽  
Human Dentin

AbstractMice are commonly considered the model mammal for many biomedical studies. In this work, mouse and human dentin were compared to specify structural and mechanical differences to establish a baseline for comparison of dental tissues between these species. Atomic force microscopy revealed tubules of about 1.0 to 1.6 μm in diameter as the main structural feature in dentin of both species. Nanoindentation yielded the elastic modulus about 15% lower in murine intertubular dentin while the hardness was almost equal. Dynamic stiffness mapping confirmed the lower elastic properties and also revealed that the peritubular region of increased mineralization around tubules is drastically reduced or maybe absent in murine dentin of this age. This study suggests that structural and mechanical differences need to be considered when murine dentin is used as a model system.

Stress-Depth Profiles in Magnetron Sputtered Mo Films Using Grazing Incidence X-Ray Diffraction (GIXD)

1993 ◽  
Vol 37 ◽  
pp. 189-196 ◽  
Author(s):  
B. L. Ballard ◽  
P. K. Predecki ◽  
D. N. Braski
Keyword(s):  
Grazing Incidence ◽  
X Ray Diffraction ◽  
Vycor Glass ◽  
X Ray ◽  
Force Microscopy ◽  
Fine Grained ◽  
Atomic Force ◽  
Grazing Incidence Diffraction ◽  
Composition Profiles ◽  
Deposition Mode

AbstractIntrinsic stresses as a function of σ, the 1/e penetration depth were measured for a smooth, 1μm thick, fine grained, cylindrical post magnetron sputtered molybdenum film deposited on a vycor glass substrate in the dynamic deposition mode. Using grazing incidence diffraction and the Mo (321) reflection, lattice spacing profiles were determined for τ values from 200-4400 Å. The in-plane intrinsic stresses parallel and perpendicular to the post axis were determined employing the ϕ-integral method and assuming elastic isotropy. The results were related to the surface structure and composition profiles via atomic force microscopy (AFM) and auger electron spectroscopy (AES) respectively.

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