Results 271 to 280 of about 246,187 (316)
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Orthodontic bonding to porcelain—Bond strength and refinishing
American Journal of Orthodontics and Dentofacial Orthopedics, 1988Glazed porcelain surfaces are not amenable to resin penetration for orthodontic bonding. The aims of this study were to evaluate (1) the bond strengths of two orthodontic composite materials to treated porcelain surfaces, (2) the effect of thermocycling, and (3) the porcelain surfaces after refinishing.
G A, Smith +3 more
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Acta Odontologica Scandinavica, 1996
No currently available bond test for dental metal ceramic systems has yet gained general acceptance. Such a bond test cannot be established without careful analysis of the stress distribution within the adherence region. The objective of the present study was to establish a mechanical shear stress test and combine the results with a finite element ...
M, Persson, M, Bergman
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No currently available bond test for dental metal ceramic systems has yet gained general acceptance. Such a bond test cannot be established without careful analysis of the stress distribution within the adherence region. The objective of the present study was to establish a mechanical shear stress test and combine the results with a finite element ...
M, Persson, M, Bergman
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Nature, 2008
Postdocs are attempting to organize and improve their lot worldwide — but results have been mixed. Paul Smaglik reports.
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Postdocs are attempting to organize and improve their lot worldwide — but results have been mixed. Paul Smaglik reports.
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Strength of hydrogen bonds in ? helices
Journal of Computational Chemistry, 1997The intramolecular helix backbone C O - - - H— N hydrogen . bonding energies in poly L-alanine a helices have been estimated both in vacuum and in an aqueous environment using the parameter sets of five of the most commonly used force fields for modeling biomolecules, namely AMBER, CHARMM, ECEPP, GROMOS, and OPLS.
Nidhi Arora, B. Jayaram 0001
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A critique of bond strength measurements
Journal of Dentistry, 1989The lack of consistent values for dentine bond strengths in shear or in tension from what are superficially identical experimental procedures has led to ambiguities in the interpretation of the data. These variations in bond strength are usually considered to be related to different adhesive procedures.
R, Van Noort +3 more
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Bond Strength in Cold Roll Bonding
CIRP Annals, 1985Summary The mechanisms producing metallic bonds in cold welding are fracture of the contaminant surface film, extrusion of base material through the cracks and builoup of real contact and coalescing with base material of the opposite surface. Bay has earlier proposed a general model for the bond strength in cold welding based upon a continuum ...
N. Bay +3 more
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Bond Strength of Bonded SOI Wafers
Japanese Journal of Applied Physics, 1992We developed a tensile strength measurement technique for bonded silicon-on-insulator (SOI) wafers. After oxidation, wafers are patterned, prior to bonding, to reduce the bonded area. After bonding and grinding, tensile strength is measured by pulling samples perpendicularly to the interface by holders adhesively fixed to the samples. The strength
Fumitoshi Sugimoto Fumitoshi Sugimoto +1 more
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Shear Bond Strength Of Cement To Zirconia
Journal of Adhesion Science and Technology, 2009This study investigated the shear bond strength (SBS) of various cements to zirconia ceramic.CoCr-cylinders were bonded to zirconia plates (20 mm × 10 mm × 2 mm; n = 8 per group) using four self-adhesive resin cements (one capsule, three hand-mixed) and four resin cements, partly in combination with a tribochemical/silane treatment.
Rosentritt, M. +3 more
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Residual debris and bond strength—Is there a relationship?
American Journal of Orthodontics and Dentofacial Orthopedics, 1988A study was undertaken to test the theory that there is a relationship between bond strength at the separate interfaces of the direct bonding system and the amount of residual debris remaining on the enamel surface following removal of a bonded appliance. In separate experiments, shear loads were applied at the complete direct bonding system and at the
O'Brien, K. D. +2 more
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On the Strength of Ouroboros Hydrogen Bonds
The Journal of Physical Chemistry AContrary to the traditional inter-molecular hydrogen bonds (HBs), the strength of intra-molecular (ouroboros) HBs (IMHBs) is not uniquely and in most instances not even well-defined. The problem arises from the difficulty in separating IMHBs into distinct fragments without breaking covalent bonds, making the zero energy reference level not uniquely ...
Garrett D. Santis, Sotiris S. Xantheas
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