Results 131 to 140 of about 3,916 (178)
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In vitro cytotoxicity and dentin permeability of HEMA
Journal of Endodontics, 1996An in vitro diffusion chamber was used to measure the diffusion of 2-hydroxyethyl methacrylate (HEMA) through etched human dentin disks. Concentrations of HEMA, which diffused through dentin, were measured by ultraviolet spectroscopy, and the effect of initial HEMA concentration, dentin thickness, and back pressure on diffusion were assessed.
Bouillaguet S +4 more
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Dentin permeability to bacterial proteins in vitro
Journal of Endodontics, 1994Passage of bacterial components through dentin is a subject of recent research with in vitro as well as with in vivo models. Diffusive transport of Porphyromonas gingivalis ATCC 33277 proteins has been demonstrated by the authors with an in vitro setup closely simulating the pulp chamber. The purpose of this investigation was to study the filtration of
E, Pissiotis, L S, Spångberg
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Dentine permeability and its role in the pathobiology of dentine sensitivity
Archives of Oral Biology, 1994The classical hydrodynamic theory implicated fluid movement as a transducing mechanism in the production of dental sensitivity. This theory assumes that sensitive dentine must be permeable. Various measurements of dentine permeability are discussed, including: (1) factors that influence diffusive permeation across dentine; (2) factors that influence ...
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Dentin Permeability: Determinants of Hydraulic Conductance
Journal of Dental Research, 1978A technique is described which permits measurement of the ease with which fluid permeates dentin. This value, the hydraulic conductance of dentin, increased as surface area increases and/or as dentin thickness decreases. It increased 32-fold when dentin was acid etched due to removal of surface debris occluding the tubules.
O W, Reeder +3 more
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The Effects of Calcium Hydroxide on Dentin Permeability
Journal of Dental Research, 1986Calcium hydroxide paste was applied to human dentin in vitro to determine its effects on dentin permeability. Discs of dentin were acid-etched on both sides to permit determination of their maximum permeability. Smear layers were then applied to the enamel sides of the discs, thereby reducing dentin permeability 99%.
D H, Pashley, S, Kalathoor, D, Burnham
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The permeability of cat dentine in vivo and in vitro
Archives of Oral Biology, 1991The apparent impermeability of dentinal tubules to chemicals applied to exposed dentine in vivo was investigated. It was shown that whereas Evans' blue diffused readily into dentine in extracted teeth, it did not do so in visible amounts when it was applied in vivo.
N, Vongsavan, B, Matthews
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The effects of dentin permeability on restorative dentistry
Dental Clinics of North America, 2002The permeability properties of dentin determine its sensitivity and the degree of pulpal response to restorative procedure materials and microleakage. Most pulpal reactions are due to bacteria or bacterial products that permeate across dentin. These reactions can be prevented if dentin is sealed with resins as soon as it is exposed.
David H, Pashley +3 more
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The permeability of human dentine in vitro and in vivo
Archives of Oral Biology, 2000Experiments in cats have shown that Evans blue dye diffuses at a greater rate into dentine in recently extracted teeth than in vivo. These experiments have now been repeated in man and similar results were obtained except that, after applications in vivo, visible concentrations of the dye were present in the dentine, and in a few cases, even in the ...
N, Vongsavan, R W, Matthews, B, Matthews
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[The influence of dentin conditioning on permeability of dentin].
Deutsche Stomatologie (Berlin, Germany : 1990), 1992In this study the influence of four different pretreatments showed significant differences on the permeability of cut dentin. On the average the application of 25% polyacrylic acid increased the permeability by approximately 10 percent, the application of 34% polyacrylic acid by 30 percent.
H G, Schaller, P, Stumbaum, W, Gotze
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Regional variability in the permeability of human dentine
Archives of Oral Biology, 1987This was measured qualitatively by using dyes and quantitatively by hydraulic conductance in dentine discs and crown segments in vitro. Both types of preparation demonstrated large regional differences in permeability, with the highest values at the periphery and the lowest in the centre of the disc or crown.
D H, Pashley +4 more
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