scholarly journals A study of dental porcelain solubility - Dissolving of component elements and resultant surface roughness and abrasion.

1983 ◽  
Vol 25 (4) ◽  
pp. 262-276 ◽  
Author(s):  
Minoru NISHIYAMA ◽  
Makoto TAKAMISAWA ◽  
Masayoshi OHASHI
Keyword(s):  
Surface Roughness ◽  
Dental Porcelain

scholarly journals Surface Roughness of Dental Porcelain Fused-To-Nickel Chromium Using Different Polishing Materials and Glazing Techniques

2015 ◽  
Vol 37 (1) ◽  
Author(s):  
Lateef Essa Alwan Al-Jourani ◽  
Sabah Sahib Al-Habeeb ◽  
Ola Mohammed Abdullah
Keyword(s):  
Surface Roughness ◽  
Dental Porcelain ◽  
Nickel Chromium

scholarly journals A study on the new type porcelain furnace using infra-red ray heating element. 1 Shear bond test and surface roughness of dental porcelain.

1986 ◽  
Vol 30 (2) ◽  
pp. 360-369
Author(s):  
Hideaki Shiono ◽  
Kou Fujii ◽  
Fumihide Watanabe ◽  
Yoshiyuki Kakehashi ◽  
Yukio Kaneko ◽  
...  
Keyword(s):  
Surface Roughness ◽  
Heating Element ◽  
Dental Porcelain ◽  
Infra Red ◽  
New Type

scholarly journals Qualitative Assessment of Wear Resistance and Surface Hardness of Different Commercially Available Dental Porcelain: An in vitro Study

2016 ◽  
Vol 17 (9) ◽  
pp. 755-761 ◽  
Author(s):  
Abhishek Nagpal ◽  
Gaurav Issar
Keyword(s):  
Surface Roughness ◽  
Wear Resistance ◽  
Testing Machine ◽  
Surface Hardness ◽  
Qualitative Assessment ◽  
Wear Testing ◽  
Wear Depth ◽  
Ceramic Specimen ◽  
Dental Porcelain

ABSTRACT Introduction In an attempt to minimize wear damage to the enamel of antagonist teeth, new low and medium fusing ceramic materials have been developed. Manufacturers usually claim that these ceramics are wear-friendly because of their lower hardness, lower concentrations of crystal phase, and smaller crystal sizes. This study aimed to quantitatively analyze the wear strength of various commercially available dental porcelain with tooth enamel as well as the surface hardness of these dental porcelain. Materials and methods The basic model was designed as a pin on plate arrangement. The tooth specimens were mounted on the stylus which was centered on the ceramic specimen in a wear testing machine. The dental ceramic specimen was centered in the metal die. A load of 40 N was applied at a rate of 80 cycles/minute for 15 minutes. In the current study, mean wear depth (Ra) value, volumetric loss, and surface hardness were obtained by standard quantification method and were statistically evaluated. Results Ceramco-3 was reported to be most abrasive for enamel; however, Duceram love significantly more abraded itself than the other two, Ceramco-3 and Vita Alpha, and generated the lowest loss of enamel. Also, same abrasive type of wear was revealed for all three variants of tested ceramics. Conclusion Ceramco-3 was the most abrasive for enamel, while surface roughness (mean wear depth) of Duceram love was maximum and for Ceramco-3 it was minimum. The value of surface roughness for Vita Alpha was in between Duceram love and Ceramco-3. Nonetheless, the mean surface hardness of Duceram love was found to be least and maximum for Vita Alpha. Clinical significance In situations of dental wear and wasting tooth disease (Attrition/Abrasion), Duceram can be applied in lieu of Ceramco-3 so as to prevent worsening of existing dentition. However, in younger patients Vita Alpha would offer maximum durability due to its greater surface hardness. How to cite this article Singh A, Nagpal A, Pawah S, Pathak C, Issar G, Sharma P. Qualitative Assessment of Wear Resistance and Surface Hardness of Different Commercially Available Dental Porcelain: An in vitro Study. J Contemp Dent Pract 2016; 17(9):755-761.

Roughness measurements of nonlinear optical polymer films by scanning tunneling microscopy

1989 ◽  
Vol 47 ◽  
pp. 22-23
Author(s):  
I. H. Musselman ◽  
R.-T. Chen ◽  
P. E. Russell
Keyword(s):  
Surface Roughness ◽  
Scanning Tunneling Microscopy ◽  
Nonlinear Optical ◽  
Polymer Surface ◽  
Light Extinction ◽  
Scanning Tunneling ◽  
Silicon Substrates ◽  
Tunneling Microscopy ◽  
Optical Polymer ◽  
Total Light

Scanning tunneling microscopy (STM) has been used to characterize the surface roughness of nonlinear optical (NLO) polymers. A review of STM of polymer surfaces is included in this volume. The NLO polymers are instrumental in the development of electrooptical waveguide devices, the most fundamental of which is the modulator. The most common modulator design is the Mach Zehnder interferometer, in which the input light is split into two legs and then recombined into a common output within the two dimensional waveguide. A π phase retardation, resulting in total light extinction at the output of the interferometer, can be achieved by changing the refractive index of one leg with respect to the other using the electrooptic effect. For best device performance, it is essential that the NLO polymer exhibit minimal surface roughness in order to reduce light scattering. Scanning tunneling microscopy, with its high lateral and vertical resolution, is capable of quantifying the NLO polymer surface roughness induced by processing. Results are presented below in which STM was used to measure the surface roughness of films produced by spin-coating NLO-active polymers onto silicon substrates.

Surface roughness measurements of vanadium-contaminated fluidized cracking catalysts by atomic force microscopy

1996 ◽  
Vol 54 ◽  
pp. 866-867
Author(s):  
H. Kinney ◽  
M.L. Occelli ◽  
S.A.C. Gould
Keyword(s):  
Surface Roughness ◽  
Zeolite Y ◽  
Atomic Level ◽  
Microporous Structure ◽  
Contact Mode ◽  
Force Microscopy ◽  
Atomic Force ◽  
Before And After ◽  
Roughness Measurements ◽  
Cracking Catalysts

For this study we have used a contact mode atomic force microscope (AFM) to study to topography of fluidized cracking catalysts (FCC), before and after contamination with 5% vanadium. We selected the AFM because of its ability to well characterize the surface roughness of materials down to the atomic level. It is believed that the cracking in the FCCs occurs mainly on the catalysts top 10-15 μm suggesting that the surface corrugation could play a key role in the FCCs microactivity properties. To test this hypothesis, we chose vanadium as a contaminate because this metal is capable of irreversibly destroying the FCC crystallinity as well as it microporous structure. In addition, we wanted to examine the extent to which steaming affects the vanadium contaminated FCC. Using the AFM, we measured the surface roughness of FCCs, before and after contamination and after steaming.We obtained our FCC (GRZ-1) from Davison. The FCC is generated so that it contains and estimated 35% rare earth exchaged zeolite Y, 50% kaolin and 15% binder.

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