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Topic: Dentine


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 Bioline International Official Site (site up-dated regularly)
Dentine forms the bulk of the tooth and is perforated by tubules that extend from the pulp to the enamel-dentine or cement-dentine junction.
The density and diameter of the dentinal tubules increases with dentine depth from the EDJ (Enamel dentine junction) to the pulp region.
The hydraulic conductance of dentine is determined by a number of variables that include the pressure moving fluid across the dentine, the length of the dentinal tubules, the viscosity of the fluid and the radius of the tubules.
www.bioline.org.br /request?mj03004   (6247 words)

  
 Dentine
Dentine is the main supporting structure of the tooth and is the second hardest tissue in the body after enamel.
The main structure is the dentinal tubule, which extends from the external surface to the pulp.
Tertiary dentine has few tubules and is darker in colour and very dense in structure.
www.vet.ed.ac.uk /clive/cal/Dentistry/Website/Basics/anatomy/dentine.html   (141 words)

  
 Inactivation of local   (Site not responding. Last check: 2007-10-21)
Aims The aim of the study was to investigate the inactivation by dentine of the antibacterial activity of various commonly used local root canal medicaments.
Dentine was sterilized by autoclaving and crushed into powder with a particle size of 0.2-20µm.
Aliquots of dentine suspension were incubated with the medicaments in sealed test tubes at 37°C for 24 h or 1 h before adding the bacteria.
www.niom.no /Publikasjoner/Sammendrag/2000/inactivation_of_local.htm   (278 words)

  
 Impact of tooth-age on enamel and dentine auto-fluorescence using QLF   (Site not responding. Last check: 2007-10-21)
University of Liverpool, England, UK Objectives: To determine the impact of age related changes in dentine on the auto-fluorescence of both enamel and dentine under QLF conditions.
The enamel and dentine of each sample was imaged using QLF; enamel (buccal and palatal), dentine (mesial and distal).
The dentine translucency estimated age was also correlated against known age to act as a positive control.
iadr.confex.com /iadr/bsdr04/techprogram/abstract_49312.htm   (321 words)

  
 BDJ | Do adhesive resins protect dentine from erosion by acids?   (Site not responding. Last check: 2007-10-21)
The objectives were to observe and quantify the effects of acids and the soft tissues, especially the tongue, on dentine and the bonding agents using four assessment techniques: qualitative assessment with SEM, surface roughness and thickness of resin with the TSM and volume loss with the laser profilometer.
The dentine sections were protected by two resins and subjected to a tooth wear regime.
For patients with uncontrolled erosion or tooth wear, applying a dentine bonding agent to exposed dentine is a practical option to prevent further damage.
www.nature.com /cgi-taf/dynapage.taf?file=/bdj/journal/v196/n6/full/4811081a.html   (712 words)

  
 Dentine pin - Patent 4219620
A dentine pin has a screw-threaded portion intended to break off and remain in the dentine, a shank, and a latch portion for engagement by the latch of a dental handpiece.
A known form of dentine pin comprises a threaded portion which is attached by way of a neck to a cylindrical shank designed to fit into the handpiece of a dental drill.
The known dentine pin suffers from the disadvantage that it is difficult to align the pin with the pre-drilled hole in order to screw the pin into the dentine.
www.freepatentsonline.com /4219620.html   (1396 words)

  
 Margaret Dentine named to CALS research post (Mar 18, 1999)
Margaret R. Dentine, a dairy cattle geneticist, has been named associate dean for research and executive director of the Wisconsin Agricultural Experiment Station at the College of Agricultural and Life Sciences.
Dentine will be administering all state and federal research funds for CALS and oversee all external research support, according to Aberle.
Dentine was among the first to combine traditional approaches to animal breeding, which rely on quantitative genetics, with the recent advances in molecular genetics.
www.news.wisc.edu /937.html   (317 words)

  
 Evidence based treatment of dental caries
In the outer layer, the dentine is heavily infected with bacteria.
Arrested caries in dentine is clinically defined by hardness of the dentine surface and a yellow to dark brown colour.
Dentine and dentine reactions in the oral cavity.
www.eclipse.co.uk /moordent/eviden.htm   (4343 words)

  
 Dentinogenesis
The dentine is a highly permeable tissue, because densely packed dentinal tubules radiate from the pulp throughout all the layers.
In rat molars, the dentine formation slows down gradually during both the primary and the secondary dentinogenesis with no apparent transition from the former to the latter (Johannessen 1961, Hietala & Larmas 1992, Kortelainen & Larmas 1994).
The tertiary dentine may also be named according to the quality of the irritation: The dentine formed as a response to attrition, abrasion or erosion is called "reactional dentine" to separate it from caries and preparation induced "reparative dentine".
herkules.oulu.fi /isbn9514253620/html/x405.html   (611 words)

  
 Environmental Health Perspectives 105-8, 1997: Article by Gulson and Gillings
In three teeth, the circumpulpal dentine and cementum were removed from slices of the root and compared with contiguous slices in which the circumpulpal dentine and cementum were retained to evaluate the effect of circumpulpal dentine on lead isotopic composition and concentration.
Such a hypothesis is supported by the observation that, in analyses of contiguous slices where the circumpulpal dentine was intact and removed, the data for the slice with removed circumpulpal dentine is invariably of poorer correlation compared with the slice where the circumpulpal dentine is retained.
Alternative explanations for the reverse isotopic trends in dentine may be that the lead is mobilized from an endogenous source, such as cortical bone, and introduced to the dentine via the dentinal tubules, or that they reflect a two-way migration of lead in dentine.
ehp.niehs.nih.gov /members/1997/105-8/gulson-full.html   (3431 words)

  
 Dentine minerals
Ca/P ratio was the same (1.8) in all the groups in dentine formed both before and after the onset of the experimental period.
The amount of calcium in dentine formed before the experiment was higher than that formed during the experiment in all the groups, except in the group 2 (metabolic acidosis), in which it was lower (Table 7).
Median (md) dentine mineral contents in dentine formed before (a) and during (b) the experimental period, given in weight percentages.
herkules.oulu.fi /isbn9514253620/html/x1261.html   (320 words)

  
 Autofluorescence - a potential method for the in vitro validation of carious dentine   (Site not responding. Last check: 2007-10-21)
Autofluorescence distribution from carious dentine correlated with the highly softened tissue (detected using the Knoop indenter) and terminated at a level superficial to the translucent zone.
Researchers also have a problem because dentine hardness is dependent on the degree of mineralisation of the tissue and there is quite a variation in the hardness of sound dentine as illustrated in this and other studies.
Superficial dentine close to the EDJ and deep dentine close to the pulp are softer than the intervening dentine.
www.nature.com /cgi-taf/DynaPage.taf?file=/bdj/journal/v187/n4/full/4800240a1.html   (803 words)

  
 Palaeos Vertebrates: Bones: Teeth: Overview-3
Isolated scales of this type are known from the Furongian (Late Cambrian), and the typical dentine scale cone is commonplace among both the Pteraspidomorphi and Thelodonti.
The dentine tubules and canals are generally straight and there are relatively few spaces (trapped cell bodies) in the crown.
The pulp cavity is barely discernable, and its margin is rough or indistinct in the central region.
www.palaeos.com /Vertebrates/Bones/Teeth/Teeth3.html   (2641 words)

  
 Margaret R. Dentine   (Site not responding. Last check: 2007-10-21)
Dentine conducts research in genetics of longevity in dairy cattle and computer modeling of population improvement systems including additive and non-additive sources.
She is studying DNA markers linked to performance traits, development of bovine gene map, marker-assisted selection of superior animals, management of progeny testing schemes and evaluation of population improvement schemes.
Dentine has developed a practical genotyping technique using small milk samples instead of quarts of milk.
www.wisc.edu /dysci/facstaff/dentine/dentine.htm   (95 words)

  
 [No title]
Dentin was treated with either 10% phosphoric acid for 15, 30 or 60 seconds or with 37% phosphoric acid for 15, 30 or 60 seconds.
This is the result of numerous factors, such as the nonretentive nature of the lesion, large areas of exposed dentin with limited enamel margins, and the high degree of flexure from occlusion that is transmitted to the restoration.
It was concluded that the bond established between dentin and the resin composite was stable during the observation period, and that the filling material had not been harmful to the surrounding tissues.
www.lib.umich.edu /dentlib/nihcdc/searches/mccomb/mccomb1e-2.txt   (18749 words)

  
 Chapt 6 - Dentine/Pulp
Dentine can be divided up into mantle dentine - 10µm thick outer layer under enamel - and circumpulpal dentine.
Their diameter varies and reduces with age by deposition of peritubular dentine until total blockage occurs and the dentine becomes sclerotic.
Dentine may be studied in both ground and decalcified sections.
www.dentistry.leeds.ac.uk /OROFACE/PAGES/chapt6x.html   (323 words)

  
 Method and arrangement for producing a bridge for anchorage elements in dentine - Patent 5052928
Identification data introduced or utilized in this or these stages relating to the individual different heights of the anchorage elements above the dentine and their different relative inclinations, and the positions and directions of the modular elements in relation to one another and to the anchorage elements are obtained and stored.
The different heights H, H' are dependent on the appearance of the individual dentine, and any inclinations of the implanted pins are dependent on the fact that it is not possible to predict the directions of the pins inserted by an operation.
The requirement imposed on the bridge structure is thus that the bridge elements shall be essentially in line with the direction of the dentine, including in the sense of the width or depth of the dentine.
www.freepatentsonline.com /5052928.html   (3384 words)

  
 CALS dairy scientist wins animal breeding award
Dairy scientist Margaret R. Dentine has received the J. Lush Award in Animal Breeding in recognition of her outstanding research accomplishments in dairy cattle breeding.
Dentine has developed a method that more effectively utilizes the marker information, allowing researchers to make more informed choices, with fewer mistakes, about genetic potential in cattle.
Dentine is on the faculty of the Department of Dairy Science and serves as interim associate dean for research at the College of Agricultural and Life Sciences and interim executive director of the Wisconsin Agricultural Experiment Station.
www.news.wisc.edu /wire/i081298/mden.html   (261 words)

  
 Mutans streptococci
When caries lesions which have reached dentine are studied histologically the dentine can be seen to be covered with necrotic material and microbiological examination shows that this area is colonized by mainly gram-positive acidogenic and aciduric bacteria.
Ultraviolet-irradiated dentin powder and gamma-irradiated IC were used to assess the collagenolytic activity of test strains during bacterial growth.
AC, IC and acid-treated dentin powder were used to determine the collagenolytic activity of sonicated bacterial whole cells and cell-free culture supernatants recovered from test strains after growth.
www.db.odont.lu.se /mutans/mutdent90-5.html   (3413 words)

  
 CFB publicationso1
Moisture fluctuation within dentine was minimised by conducting all procedures under copious irrigation or in sealed containers of lubricant at pH=7.0.
Although we might expect dentine wear characteristics to vary from enamel due to structural differences, little is known about the nature of human dentine wear.
Enamel wear rates were less than dentine at the lighter loads of 6.2 kg (p<0.02) and 9.95 kg (p<0.05), whereas similar rates of wear were demonstrated for the two tissues at the highest load.
www.health.adelaide.edu.au /CFB/pub02.htm   (938 words)

  
 High-sucrose diet and dentine
Also, dentine may be infected through an incipient enamel lesion, even when no cavitation has occurred on the enamel surface.
During secondary dentinogenesis, the rate of the dentine formation and the caries progression both are less than 1/10 of that during the the primary dentinogenesis.
Calcium, phosphorus, fluoride, sodium, magnesium, zinc and the total content of minerals in dentine were determined with SEM equipped with an electron probe microanalyzer (EPMA).
herkules.oulu.fi /isbn9514253620/html/x373.html   (684 words)

  
 Everything you wanted to know about Ivory - Mel Fisher Maritime Heritage Society and Museum in Key West, Florida
Dentine is a combination of mineralized connective tissues and collagen proteins.
Dentine is the main component in ivory and it is this layer that is utilized for carvings, inlays, etc.
The primary dentine layer has a typical ivory appearance, but the secondary layer has a marbled or oatmeal-like appearance.
www.melfisher.org /aboutivory.htm   (1034 words)

  
 dentine   (Site not responding. Last check: 2007-10-21)
Sensitivity to pain, pressure, and temperature is transmitted via the odontoblastic extensions in the tubules to and from the nerve in the pulp chamber.
Secondary dentine, a less well-organized form of tubular dentine, is produced throughout life as a patching material where cavities have begun, where the overlying enamel has been worn away, and within the pulp chamber as part of the aging process.
A few animals, such as flounder and cod, have vasodentine, in which tubules are lacking, and the dentine is nourished directly by capillaries.
www.brain.net.pk /~geti/dentine.html   (232 words)

  
 Bone, enamel, dentine, milk & saliva share gene family
Sometime after the move from spineless to having a backbone, the family of genes that controls tissue mineralization evolved to produce mammalian tooth enamel, bones and dentine, but fish enameloid developed from different genes, according to Penn State researchers.
While similar structures and traits are often similar because they come from the same genetic basis, it is not unusual to have physical traits that look alike and serve the same purpose, developed from completely unrelated genes.
The genes responsible for bones, enamel, dentine, milk and saliva in most vertebrates belong to the same family; that is, they descend from a common ancestral gene, and for the most part, reside on the same chromosome.
www.eurekalert.org /pub_releases/2004-07/ps-bed072304.php   (770 words)

  
 [No title]
Studies were conducted to assess the effect of adjacent dentine sections on the de- and remineralisation of enamel in vitro.
Subsequently, enamel lesions and sound dentine were placed in an acid-gel system at pH 5.0, the enamel again either isolated or adjacent to dentine, with initial DSen (degree of saturation with respect to enamel) values adjusted to 0, 0.15 and 0.32 by adding calcium phosphate to the system.
In conclusion, we have demonstrated inhibition of enamel demineralisation and the remineralisation of enamel lesions in the presence of dentine sections under acidic conditions which otherwise led to (further) demineralisation.
www.ibcglobal.com /managedevents/pm/biorads/agenda/lynch.doc   (344 words)

  
 Inactivation of root canal medicaments   (Site not responding. Last check: 2007-10-21)
Fifty µl of saturated calcium hydroxide solution, 0.05% clorhexidine acetate or 0.2/0.4% iodine potassium iodide were incubated at 37°C with 28 mg dentine powder (DP), hydroxylapatite (HA) or bovine serum albumin (BSA) in 50 µl water for 1 h before adding 50 µl of the bacterial suspension.
Conclusion Inhibition by dentine of the antibacterial activity of calcium hydroxide, chlorhexidine and iodine potassium iodide occurs by different mechanisms.
Different components of dentine may be responsible for the inhibition of these three medicaments.
www.niom.no /Publikasjoner/Sammendrag/2001/inactivation_of_root_canal_medicaments.htm   (309 words)

  
 Additional Reading - Dentinal Hypersensitivity
Effects produced by the uptake in vitro of metal ions, fluoride and formaldehyde onto dentine.
Brännström M: The hydrodynamic theory of dentinal pain: sensation in preparations, caries and the dentinal crack.
Chabanski MB, Gillium DG, Bulman JS, Newman HN: Prevalence of cervical dentine sensitivity in a population of patients referred to a specialist periodontology department.
www.dentalcare.com /soap/ce18ej/dhread.htm   (653 words)

  
 Protein analysis of carious and sound dentine digested by pepsin   (Site not responding. Last check: 2007-10-21)
Objectives: Recently developed dentine caries removal systems based on chemo-mechanical or enzymatic principles are aimed at dissolving denatured collagen and other proteins in the lesion.
Methods: Carious and sound dentine powder was collected separately from 20 permanent teeth with a rose-bur on a low-speed hand-piece.
Results: For carious dentine, the soluble fraction after demineralization demonstrated 2 bands at 62 and 56 kDa ("caries bands"), not seen in sound dentine.
iadr.confex.com /iadr/2004Hawaii/techprogram/abstract_40619.htm   (354 words)

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