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dental enamel grade mineralization

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https://www.readbyqxmd.com/read/24132236/the-origin-of-conodonts-and-of-vertebrate-mineralized-skeletons
#1
Duncan J E Murdock, Xi-Ping Dong, John E Repetski, Federica Marone, Marco Stampanoni, Philip C J Donoghue
Conodonts are an extinct group of jawless vertebrates whose tooth-like elements are the earliest instance of a mineralized skeleton in the vertebrate lineage, inspiring the 'inside-out' hypothesis that teeth evolved independently of the vertebrate dermal skeleton and before the origin of jaws. However, these propositions have been based on evidence from derived euconodonts. Here we test hypotheses of a paraconodont ancestry of euconodonts using synchrotron radiation X-ray tomographic microscopy to characterize and compare the microstructure of morphologically similar euconodont and paraconodont elements...
October 24, 2013: Nature
https://www.readbyqxmd.com/read/21890367/insights-into-the-structure-and-composition-of-the-peritubular-dentin-organic-matrix-and-the-lamina-limitans
#2
Luiz Eduardo Bertassoni, Katerina Stankoska, Michael Vincent Swain
Dentin is a mineralized dental tissue underlying the outer enamel that has a peculiar micro morphology. It is composed of micrometer sized tubules that are surrounded by a highly mineralized structure, called peritubular dentin (PTD), and embedded in a collagen-rich matrix, named intertubular dentin. The PTD has been thought to be composed of a highly mineralized collagen-free organic matrix with unknown composition. Here we tested the hypothesis that proteoglycans and glycosaminoglycans, two important organic structural features found in dentin, are key participants in the microstructure and composition of the PTD...
February 2012: Micron: the International Research and Review Journal for Microscopy
https://www.readbyqxmd.com/read/20848008/review-of-the-effects-of-infiltrants-and-sealers-on-non-cavitated-enamel-lesions
#3
REVIEW
Kamila Rosamilia Kantovitz, Fernanda Miori Pascon, Marinês Nobre-dos-Santos, Regina Maria Puppin-Rontani
PURPOSE: The aim of the present study was to perform a review of the effects of infiltrants and sealers on the inhibition of enamel demineralisation. MATERIALS AND METHODS: The authors searched the Cochrane Library, Embase, PubMed and Web of Science (ISI) for papers published between January 1970 and September 2008. The main search terms were 'artificial caries' or 'caries treatment' or 'caries-like lesion' or 'white spot lesion' or 'enamel demineralisation' or 'natural caries' and 'enamel' and 'sealant' or 'resin infiltration'...
2010: Oral Health & Preventive Dentistry
https://www.readbyqxmd.com/read/19728580/analysis-of-some-elements-in-primary-enamel-during-postnatal-mineralization
#4
Nina Sabel, Gunilla Klinberg, Sandor Nietzsche, Agneta Robertson, Hans Odelius, Jörgen G Norén
The primary teeth start to mineralize in utero and continue development and maturation during the first year of life.The aim of this study was to investigate the concentrations of some elements, C, F, Na, Mg, Cl, K and Sr, by secondary ion mass spectrometry (SIMS) in human primary incisors at different stages of mineralization.The teeth derived from an autopsy material from children who had died in sudden infant death.The buccal enamel of specimens from the ages 1, 2, 3, 4, 6 and 19 months, respectively, was analyzed...
2009: Swedish Dental Journal
https://www.readbyqxmd.com/read/19255778/the-scpp-gene-repertoire-in-bony-vertebrates-and-graded-differences-in-mineralized-tissues
#5
Kazuhiko Kawasaki
The vertebrate tooth is covered with enamel in most sarcopterygians or enameloid in chondrichthyans and actinopterygians. The evolutionary relationship among these two tissues, the hardest tissue in the body, and other mineralized tissues has long been controversial. We have recently reported that specific combinations of secretory calcium-binding phosphoprotein (SCPP) genes are involved in the mineralization of bone, dentin, enameloid, and enamel. Thus, the early repertoire of SCPP genes would elucidate the evolutionary relationship across these tissues...
March 2009: Development Genes and Evolution
https://www.readbyqxmd.com/read/17634723/effect-of-cpp-acp-paste-on-tooth-mineralization-an-fe-sem-study
#6
Maki Oshiro, Kanako Yamaguchi, Toshiki Takamizawa, Hirohiko Inage, Takayuki Watanabe, Atsushi Irokawa, Susumu Ando, Masashi Miyazaki
Milk and milk products, such as cheese, have been shown to exhibit anticariogenic properties in human and animal models. CPP-ACP shows an anti-caries effect by suppressing demineralization, enhancing remineralization, or possibly a combination of both. The purpose of this study was to evaluate the effect of CPP-ACP paste on demineralization by observing the treated tooth surface using an FE-SEM. The specimens were prepared by cutting enamel and dentin of bovine teeth into blocks. A few specimens were stored in 0...
June 2007: Journal of Oral Science
https://www.readbyqxmd.com/read/17079114/prenatal-manganese-levels-linked-to-childhood-behavioral-disinhibition
#7
Jonathon E Ericson, Francis M Crinella, K Alison Clarke-Stewart, Virginia D Allhusen, Tony Chan, Richard T Robertson
Although manganese (Mn) is an essential mineral, high concentrations of the metal can result in a neurotoxic syndrome affecting dopamine balance and behavior control. We report an exploratory study showing an association between Mn deposits in tooth enamel, dating to the 20th and 62-64th gestational weeks, and childhood behavioral outcomes. In a sample of 27 children, 20th week Mn level was significantly and positively correlated with measures of behavioral disinhibition, specifically, play with a forbidden toy (36 months), impulsive errors on a continuous performance and a children's Stroop test (54 months), parents' and teachers' ratings of externalizing and attention problems on the Child Behavior Checklist (1st and 3rd grades), and teacher ratings on the Disruptive Behavior Disorders Scale (3rd grade)...
March 2007: Neurotoxicology and Teratology
https://www.readbyqxmd.com/read/16555304/early-evolution-of-vertebrate-skeletal-tissues-and-cellular-interactions-and-the-canalization-of-skeletal-development
#8
REVIEW
Philip Conrad James Donoghue, Ivan James Sansom, Jason Philip Downs
The stratigraphically earliest and the most primitive examples of vertebrate skeletal mineralization belong to lineages that are entirely extinct. Therefore, palaeontology offers a singular opportunity to address the patterns and mechanisms of evolution in the vertebrate mineralized skeleton. We test the two leading hypotheses for the emergence of the four skeletal tissue types (bone, dentine, enamel, cartilage) that define the present state of skeletal tissue diversity in vertebrates. Although primitive vertebrate skeletons demonstrate a broad range of tissues that are difficult to classify, the first hypothesis maintains that the four skeletal tissue types emerged early in vertebrate phylogeny and that the full spectrum of vertebrate skeletal tissue diversity is explained by the traditional classification system...
May 15, 2006: Journal of Experimental Zoology. Part B, Molecular and Developmental Evolution
https://www.readbyqxmd.com/read/16414277/structure-and-mechanical-properties-of-the-soft-zone-separating-bulk-dentin-and-enamel-in-crowns-of-human-teeth-insight-into-tooth-function
#9
Paul Zaslansky, Asher A Friesem, Steve Weiner
The 200-300 microm soft zone of dentin, found beneath enamel in crowns of human teeth, is thought to fulfill important roles in tooth function, but little is known about its structure-mechanical relations. Scanning electron microscopy images of fracture surfaces showed that near the dentino-enamel junction (DEJ), a porous reticulate matrix of intertubular-dentin contains tubules with no peritubular lining. Peritubular-dentin however is found at some distance from the DEJ, and it gradually thickens with increasing depth into the bulk dentin...
February 2006: Journal of Structural Biology
https://www.readbyqxmd.com/read/14674490/histological-morphological-profilometric-and-optical-changes-of-human-tooth-enamel-after-microabrasion
#10
COMPARATIVE STUDY
Patrick Roger Schmidlin, Till Nicolaus Göhring, Jens Schug, Felix Lutz
PURPOSE: To determine the loss of enamel after a single 20-secondsapplication of a microabrasion slurry and to evaluate structural changes by means of laser fluorescence, and microscopic and optical measurements. METHODS: Defined buccal areas with a diameter of 2 mm from 16 extracted human molars were demineralized for 12 weeks using a demineralization gel (pH 4.8). The created artificial white-spot lesions were divided corono-apically in control and test sites, using a rubber cement that prospectively covered the untreated control site...
September 2003: American Journal of Dentistry
https://www.readbyqxmd.com/read/11511679/high-resolution-immunocytochemistry-of-noncollagenous-matrix-proteins-in-rat-mandibles-processed-with-microwave-irradiation
#11
V E Arana-Chavez, A Nanci
The mineral phase in calcified tissues represents an additional factor to be considered during their preservation for ultrastructural analyses. Microwave (MW) irradiation has been shown to facilitate fixative penetration and to improve structural preservation and immunolabeling in a variety of soft tissues. The aim of the present study was to determine whether MW processing could offer similar advantages for hard tissues. Rat hemimandibles were immersed in 4% formaldehyde + 0.1% glutaraldehyde buffered with 0...
September 2001: Journal of Histochemistry and Cytochemistry: Official Journal of the Histochemistry Society
https://www.readbyqxmd.com/read/10706481/ultrastructural-preservation-of-rat-embryonic-dental-tissues-after-rapid-fixation-and-dehydration-under-microwave-irradiation
#12
L F Massa, V E Arana-Chavez
Adequate preservation of the cells and matrix of mineralising tissues remains difficult, as organic components and initial mineral deposits may be lost during conventional processing for electron microscopy. In this study, we have reduced significantly the processing time using microwave irradiation. Rat molar tooth germs were fixed in 4% glutaraldehyde + 4% formaldehyde with 0.1 M sodium cacodylate in a laboratory microwave oven for two periods of 20 s with a maximal temperature of 37 degrees C. After conventional washing and post-fixation, specimens were dehydrated in graded ethanols under microwave irradiation for a total of 7 min 20 s...
February 2000: European Journal of Oral Sciences
https://www.readbyqxmd.com/read/10075148/effects-of-caffeine-on-fluoride-calcium-and-phosphorus-metabolism-and-calcified-tissues-in-the-rat
#13
X Chen, G M Whitford
This 6-week study was designed to determine the effects of graded doses of caffeine intake (3, 25 or 100 mg/kg per day) on the metabolic balance and tissue concentrations of fluoride, calcium and phosphorus in Sprague-Dawley rats. Caffeine intake did not affect the absorption, urinary excretion or balance of fluoride, the plasma, bone or enamel concentrations of fluoride, nor the occurrence of incisor enamel fluorosis. Neither did it affect the metabolism of calcium or phosphorus except that the urinary excretion of calcium was increased...
January 1999: Archives of Oral Biology
https://www.readbyqxmd.com/read/7373428/effects-of-zinc-deficiency-on-dental-caries-in-rats
#14
M M Fang, K Y Lei, L T Kilgore
The effects of graded levels of dietary zinc on the development and mineralization of teeth and bones and on the susceptibility of teeth to dental caries were studied in young growing rats. Thirty-six weanling male Sprague-Dawley rats were randomly assigned to four dietary treatments: 1) zinc-deficient, less than 1 ppm; 2) 12 ppm zinc; 3) 36 ppm zinc, and 4) 108 ppm zinc. For treatments 2, 3 and 4, rats were pair-fed the quantity of feed consumed by their individual counterparts fed the zinc-deficient diet...
May 1980: Journal of Nutrition
https://www.readbyqxmd.com/read/3868892/-enamel-structure-and-mineralization-in-grade-2-or-3-enamel-extensions-and-enamel-pearls
#15
D Gaspersic
No abstract text is available yet for this article.
1985: Zobozdravstveni Vestnik
https://www.readbyqxmd.com/read/3272433/-effect-of-a-mineralizing-solution-minersol-on-acid-solubility-resistance-of-enamel
#16
M J Rodríguez Miro, L Elías Avila, E Gispert Abreu
Degree of mineralization of enamel is one of the parameters mediating in its resistance to acid dissolution and at the stage of teething, the enamel is immature and, therefore, present a higher susceptibility to dental caries. This investigation was carried out with 38 preschool children (means = 5.5 years) and 19 children coursing second grade (means = 7.6 years). They were treated with 10 oral rinsing with mineralizing solution in order to evaluate its effect on enamel resistance to acid dissolution; colorimetric technique was used for such purpose...
September 1988: Revista Cubana de Estomatología
https://www.readbyqxmd.com/read/2749785/-the-ca-and-p-content-of-various-layers-of-human-dental-enamel-in-differing-manifestations-of-fluorosis
#17
COMPARATIVE STUDY
A K Nikolishin, E V Borovskiĭ, E V Poziukova
X-ray spectral microanalysis was applied to study Ca and P contents in superficial, intermedial and deep enamelum zones in 15 human teeth with different fluorosis manifestations which were extracted for orthodontic purposes. In 3rd grade fluorosis, detected were a statistically reliable decrease in Ca content in enamelum superficial zone and a tendency of its depleting in deep zones. Ca/P ratio was also lowered that indicated mineralization impairment in solid tissues of the teeth. This should affect the choice of the technique of therapy and prevention of different manifestations of teeth fluorosis...
January 1989: Stomatologii︠a︡
https://www.readbyqxmd.com/read/2405690/deciduous-enamel-defects-and-caries-susceptibility-in-a-prehistoric-ohio-population
#18
S M Duray
Clinical studies of the relationship between developmental enamel defects and caries susceptibility have often produced conflicting results. This has been due in part to a failure to distinguish between different types of defects. Studies of this association in prehistoric populations have been rare. The complete deciduous dentitions of 57 subadults from the Libben site, a large Late Woodland cemetery in Ottawa County, Ohio, were selected for analysis. Defects were classified as either hypoplasias (deficiencies in matrix apposition) or hypocalcifications (deficiencies in mineralization) and were graded for severity...
January 1990: American Journal of Physical Anthropology
https://www.readbyqxmd.com/read/1775488/posteruptive-changes-in-human-dental-fluorosis-a-histological-and-ultrastructural-study
#19
O Fejerskov, T Yanagisawa, H Tohda, M J Larsen, K Josephsen, H J Mosha
The aim of the present study was to describe the structural features characterizing the severe grades of human fluorotic enamel (TF scores 5-9) with particular emphasis on the posteruptive changes in severely fluorosed teeth. Dental fluorosis is a subsurface hypomineralized lesion deep to a well-mineralized outer enamel surface, which in severe cases breaks apart shortly after eruption. Early signs of posteruptive changes comprise small defects corresponding to the opening of striae of Retzius. The enamel pits which develop after eruption in more severe cases exhibit an increase in mineral content at their base which correspond to the exposed subsurface hypomineralized lesions...
1991: Proceedings of the Finnish Dental Society. Suomen Hammaslääkäriseuran Toimituksia
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