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https://www.readbyqxmd.com/read/27447183/internal-tooth-structure-and-burial-practices-insights-into-the-neolithic-necropolis-of-gurgy-france-5100-4000-cal-bc
#1
Mona Le Luyer, Michael Coquerelle, Stéphane Rottier, Priscilla Bayle
Variations in the dental crown form are widely studied to interpret evolutionary changes in primates as well as to assess affinities among human archeological populations. Compared to external metrics of dental crown size and shape, variables including the internal structures such as enamel thickness, tissue proportions, and the three-dimensional shape of enamel-dentin junction (EDJ), have been described as powerful measurements to study taxonomy, phylogenetic relationships, dietary, and/or developmental patterns...
2016: PloS One
https://www.readbyqxmd.com/read/27343773/further-morphological-evidence-on-south-african-earliest-homo-lower-postcanine-dentition-enamel-thickness-and-enamel-dentine-junction
#2
Lei Pan, Jean Dumoncel, Frikkie de Beer, Jakobus Hoffman, John Francis Thackeray, Benjamin Duployer, Christophe Tenailleau, José Braga
The appearance of the earliest members of the genus Homo in South Africa represents a key event in human evolution. Although enamel thickness and enamel dentine junction (EDJ) morphology preserve important information about hominin systematics and dietary adaptation, these features have not been sufficiently studied with regard to early Homo. We used micro-CT to compare enamel thickness and EDJ morphology among the mandibular postcanine dentitions of South African early hominins (N = 30) and extant Homo sapiens (N = 26), with special reference to early members of the genus Homo...
July 2016: Journal of Human Evolution
https://www.readbyqxmd.com/read/27142598/enamel-ultrastructure-of-fossil-and-modern-pinnipeds-evaluating-hypotheses-of-feeding-adaptations-in-the-extinct-walrus-pelagiarctos
#3
Carolina Loch, Robert W Boessenecker, Morgan Churchill, Jules Kieser
This study aimed to assess the enamel ultrastructure in modern otariid pinnipeds and in the extinct walrus Pelagiarctos. Teeth of the New Zealand fur seal (Arctocephalus forsteri), sea lion (Phocarctos hookeri), and fossil walrus Pelagiarctos thomasi were embedded, sectioned, etched, and analyzed via scanning electron microscopy. The enamel of NZ otariids and Pelagiarctos was prismatic and moderately thick, measuring 150-450 μm on average. It consisted of transversely oriented Hunter-Schreger bands (HSBs) from the enamel-dentine junction (EDJ) to near the outer surface, where it faded into prismless enamel less than 10 μm thick...
June 2016: Die Naturwissenschaften
https://www.readbyqxmd.com/read/27086056/a-dental-perspective-on-the-taxonomic-affinity-of-the-balanica-mandible-bh-1
#4
Matthew M Skinner, Dorien de Vries, Philipp Gunz, Kornelius Kupczik, R Paul Klassen, Jean-Jacques Hublin, Mirjana Roksandic
The Middle Pleistocene represents a period of critical importance in human evolution, marked by encephalisation and dental reduction, and increasing diversification of temporally and spatially distributed hominin lineages in Africa, Asia and Europe. New specimens, especially from areas less well represented in the fossil record, can inform the debate on morphological changes to the skeleton and teeth and the phylogenetic course of human evolution during this period. The mandible from the cave of Mala Balanica, Serbia has recently been re-dated to at least 400 ka, and its well-preserved dentition presents an excellent opportunity to characterize molar crown morphology at this time period, and re-examine claims for a lack of Neandertal affinities in the specimen...
April 2016: Journal of Human Evolution
https://www.readbyqxmd.com/read/26945170/effect-of-cavity-depth-on-dentine-sensitivity-in-man
#5
Sitthichai Wanachantararak, Orapin Ajcharanukul, Noppakun Vongsavan, Bruce Matthews
OBJECTIVE: To determine if dentine at the enamel-dentine junction (EDJ) in man is more sensitive to hydrostatic pressure stimuli then deeper dentine. DESIGN: Cavities (1mm diam.) were cut at the tips of the buccal and lingual cusps of 8 premolars in 3 subjects (ages: 22-25 years). Both cavities were initially deepened to expose the EDJ then one (the test cavity) was deepened in steps of 0.5mm to a maximum of 2.0 mm below the EDJ. The cavities were tested at each stage, before and after etching, with 5s, hydrostatic pressure stimuli between 400 mm above, and 400 mm below atmospheric...
June 2016: Archives of Oral Biology
https://www.readbyqxmd.com/read/26912218/enamelin-directs-crystallite-organization-at-the-enamel-dentine-junction
#6
COMPARATIVE STUDY
S Siddiqui, M Al-Jawad
Enamel is an acellular material formed by the intricate process of amelogenesis. Disruption caused at the initial stages of development, by means of mutations in the ENAM gene encoding the enamelin protein, results in enamel hypoplasia. Little is known about the consequence of ENAM mutation on the enamel structure at a crystallographic level. The aim of this study was to characterize the structure of ENAM-mutated enamel to develop a deeper understanding of the role of enamelin protein during formation with regard to crystal organization...
May 2016: Journal of Dental Research
https://www.readbyqxmd.com/read/26374746/in-vivo-validation-of-near-infrared-light-transillumination-for-interproximal-dentin-caries%C3%A2-detection
#7
Jan Kühnisch, Friederike Söchtig, Vinay Pitchika, Rüdiger Laubender, Klaus W Neuhaus, Adrian Lussi, Reinhard Hickel
OBJECTIVES: The aims of this clinical study were to investigate the diagnostic accuracy of near-infrared light transillumination (NILT) as a novel X-ray-free method for proximal dentin caries detection and to compare this method to established diagnostic methods. MATERIALS AND METHODS: A total of 127 interproximal dentin caries lesions without any cavity within visible dentin in posterior teeth from 85 consecutively selected patients were included. Visual and radiographic diagnoses and laser fluorescence measurements were available...
May 2016: Clinical Oral Investigations
https://www.readbyqxmd.com/read/25901602/accessing-developmental-information-of-fossil-hominin-teeth-using-new-synchrotron-microtomography-based-visualization-techniques-of-dental-surfaces-and-interfaces
#8
Adeline Le Cabec, Nancy Tang, Paul Tafforeau
Quantification of dental long-period growth lines (Retzius lines in enamel and Andresen lines in dentine) and matching of stress patterns (internal accentuated lines and hypoplasias) are used in determining crown formation time and age at death in juvenile fossil hominins. They yield the chronology employed for inferences of life history. Synchrotron virtual histology has been demonstrated as a non-destructive alternative to conventional invasive approaches. Nevertheless, fossil teeth are sometimes poorly preserved or physically inaccessible, preventing observation of the external expression of incremental lines (perikymata and periradicular bands)...
2015: PloS One
https://www.readbyqxmd.com/read/25817264/evaluation-of-dermal-extracellular-matrix-and-epidermal-dermal-junction-modifications-using-matrix-assisted-laser-desorption-ionization-mass-spectrometric-imaging-in-vivo-reflectance-confocal-microscopy-echography-and-histology-effect-of-age-and-peptide-applications
#9
Philippe Mondon, Mélanie Hillion, Olivier Peschard, Nada Andre, Thibault Marchand, Emmanuel Doridot, Marc Gj Feuilloley, Cédric Pionneau, Solenne Chardonnet
This study was conducted to establish a new methodology for evaluating elements of dermal extracellular matrix (ECM), of epidermal-dermal junction (EDJ), and effects of molecules which can modulate their synthesis. This methodology is based on matrix-assisted laser desorption/ionization mass spectrometric imaging (MALDI-MSI). In vivo reflectance confocal microscopy (in vivo RCM) and echography were also used. Using immunohistochemistry methods on explants, age-related modification data were obtained for selected dermal ECM and EDJ proteins (collagen I, collagen IV, collagen VII, collagen XVII, nidogen I, decorin/decorunt) and used as reference for MALDI-MSI studies...
June 2015: Journal of Cosmetic Dermatology
https://www.readbyqxmd.com/read/25391806/evaluation-of-9-rapid-diagnostic-tests-for-screening-hiv-infection-in-lom%C3%A3-togo
#10
A Y Dagnra, S Dossim, M Salou, T Nyasenu, K Ali-Edje, A Ouro-Médeli, M Doufan, A Ehlan, M Prince-David
PURPOSE: HIV rapid diagnostic tests (RDT) could be greatly contributive for a universal access to HIV diagnosis. However, according to the WHO, these tests need to be assessed before they can be used in routine. METHOD AND RESULTS: We assessed 9 RDT in routine clinical use between 2009 and 2013. The sensitivity and specificity observed for 7 tests were≥99% and≥98%, respectively: FIRST RESPONSE HIV1-2-O PMC Medical, India, GENIE Fast HIV 1-2 and GENIE™ III HIV(1/2) Bio-Rad, France, HIV TRI-DOT+Ag;J...
December 2014: Médecine et Maladies Infectieuses
https://www.readbyqxmd.com/read/25209431/molar-crown-inner-structural-organization-in-javanese-homo-erectus
#11
Clément Zanolli
This contribution investigates the inner organizational pattern (tooth tissue proportions and enamel-dentine junction morphology) of seven Homo erectus permanent molar crowns from the late Lower-early Middle Pleistocene Kabuh Formation of the Sangiran Dome (Central Java, Indonesia). The previous study of their external characteristics confirmed the degree of time-related structural reduction occurred in Javanese H. erectus, and also revealed a combination of nonmetric features which are rare in the Lower and early Middle Pleistocene dental record, but more frequently found in recent humans...
January 2015: American Journal of Physical Anthropology
https://www.readbyqxmd.com/read/24932747/combining-radiographic-and-histological-data-for-dental-development-to-compare-growth-in-the-past-and-the-present
#12
M Christopher Dean, Helen M Liversidge, Fadil Elamin
BACKGROUND: Being able to estimate the age at death of fossil hominins enables meaningful comparisons of both dental and general growth, past and present. AIM: The aim of this study was to use data for modern permanent canine formation derived from separate histological and radiographic studies to estimate the age at death of an early African Homo erectus specimen (KNM-WT 15 000) with a developing permanent maxillary canine. METHODS: Ground sections of 18 sexed modern human canines were used to reconstruct growth in tooth height along the enamel-dentine junction (EDJ) and onwards into root formation along the cement-dentine junction (CDJ)...
July 2014: Annals of Human Biology
https://www.readbyqxmd.com/read/24689536/patterns-of-morphological-variation-in-enamel-dentin-junction-and-outer-enamel-surface-of-human-molars
#13
Wataru Morita, Wataru Yano, Tomohito Nagaoka, Mikiko Abe, Hayato Ohshima, Masato Nakatsukasa
Tooth crown patterning is governed by the growth and folding of the inner enamel epithelium (IEE) and the following enamel deposition forms outer enamel surface (OES). We hypothesized that overall dental crown shape and covariation structure are determined by processes that configurate shape at the enamel-dentine junction (EDJ), the developmental vestige of IEE. This this hypothesis was tested by comparing patterns of morphological variation between EDJ and OES in human permanent maxillary first molar (UM1) and deciduous second molar (um2)...
June 2014: Journal of Anatomy
https://www.readbyqxmd.com/read/24427292/first-early-hominin-from-central-africa-ishango-democratic-republic-of-congo
#14
Isabelle Crevecoeur, Matthew M Skinner, Shara E Bailey, Philipp Gunz, Silvia Bortoluzzi, Alison S Brooks, Christian Burlet, Els Cornelissen, Nora De Clerck, Bruno Maureille, Patrick Semal, Yves Vanbrabant, Bernard Wood
Despite uncontested evidence for fossils belonging to the early hominin genus Australopithecus in East Africa from at least 4.2 million years ago (Ma), and from Chad by 3.5 Ma, thus far there has been no convincing evidence of Australopithecus, Paranthropus or early Homo from the western (Albertine) branch of the Rift Valley. Here we report the discovery of an isolated upper molar (#Ish25) from the Western Rift Valley site of Ishango in Central Africa in a derived context, overlying beds dated to between ca...
2014: PloS One
https://www.readbyqxmd.com/read/24413405/size-and-shape-variability-in-human-molars-during-odontogenesis
#15
W Morita, W Yano, T Nagaoka, M Abe, M Nakatsukasa
Under the patterning cascade model (PCM) of cusp development inspired by developmental genetic studies, it is predicted that the location and the size of later-forming cusps are more variable than those of earlier-forming ones. Here we assessed whether differences in the variability among cusps in total and each particular crown component (enamel-dentin junction [EDJ], outer enamel surface [OES], and cement-enamel junction [CEJ]) could be explained by the PCM, using human maxillary permanent first molars (UM1) and second deciduous molars (um2)...
March 2014: Journal of Dental Research
https://www.readbyqxmd.com/read/24404318/using-skype-as-an-alternative-for-residency-selection-interviews
#16
Louito Edje, Christine Miller, Jacklyn Kiefer, David Oram
BACKGROUND: Residency interviews can place significant time and financial burdens on applicants. OBJECTIVE: To determine whether the use of Skype as a screening tool during interview season in a family medicine residency is cost-effective and time-efficient for the applicant and the residency program. METHODS: We surveyed 2 groups of medical students during interviews for our family medicine program. Thirty-two students were interviewed via our face-to-face, traditional interview (TI) process, and 10 students, the second group, who did not meet the program's standard interview selection criteria for TI, underwent our Skype interview (SI) process...
September 2013: Journal of Graduate Medical Education
https://www.readbyqxmd.com/read/23957140/onset-of-molar-incisor-hypomineralization-mih
#17
Tobias G Fagrell, Phil Salmon, Lisa Melin, Jörgen G Norén
The etiological factors and timing of the onset of molar incisor hypomineralization (MIH) are still not clear. The aim of this study was to examine ground radial and sagittal sections from teeth diagnosed with MIH using light microscopy, polarized light microscopy and X-ray micro-computed tomography (XMCT) and to estimate the onset and timing of the MIH and to relate the hypomineralized enamel to the incremental lines. Thirteen extracted permanent first molars diagnosed MIH, were analyzed with light microscopy and XMCT...
2013: Swedish Dental Journal
https://www.readbyqxmd.com/read/23291490/a-natural-functionally-graded-biocomposite-coating-human-enamel
#18
Li-Hong He, Zi-Hong Yin, Ludwig Jansen van Vuuren, Elizabeth A Carter, Xiu-Weng Liang
Human enamel has been found to be a coating with excellent mechanical performance, and has undergone extensive investigation and discussion. However, most of the reported studies consider the enamel as a homogeneous anisotropic biocomposite. The current study illustrated the graded properties of the biocomposite from its functional load-bearing direction. Within the thickness of the enamel, from the outer surface towards the enamel-dentin junction (EDJ), the elastic modulus (E(x)) and hardness (H(x)) of enamel exist in an exponential relationship with normalized thickness (x) as E(x)=111...
May 2013: Acta Biomaterialia
https://www.readbyqxmd.com/read/23135115/-finite-element-contact-stress-analysis-of-simulating-teeth-with-wedge-shaped-defects-in-the-cervical-region
#19
Wen-li Yang, Xue-feng Lin, Xiang-ru Li, Yao-peng Liu
PURPOSE: To study the distribution of stress of simulating teeth with wedge-shaped defects in the cervical region. METHODS: The models of anisotropic enamel of the mandibular first premolar and the opposite maxillary first premolar crown were created. A defect was introduced into the model of mandibular premolar in the buccal cervical region along the enamelo-dentinal junction. The stress distribution in the cervical region of the mandibular premolar was investigated with regard to different loading conditions simulating working, nonworking and vertical micromotions...
August 2012: Shanghai Kou Qiang Yi Xue, Shanghai Journal of Stomatology
https://www.readbyqxmd.com/read/22907403/a-histological-method-that-can-be-used-to-estimate-the-time-taken-to-form-the-crown-of-a-permanent-tooth
#20
M Christopher Dean
Teeth contain an incremental record of their growth in the form of periodic growth markings that are literally embodied within the structure of enamel. These can be revealed when ground sections of teeth are prepared for transmitted light microscopy. This chapter sets out one method for estimating the time taken to form the crowns of permanent teeth. First, the daily rates of enamel formation are estimated at three positions within the crown close to the enamel dentine junction (EDJ). Then a 200 μm length along an enamel prism that take ∼80 days to form is followed out from the EDJ at the dentine horn...
2012: Methods in Molecular Biology
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