Base de dados : MEDLINE
Pesquisa : I01.076.368.584.583 [Categoria DeCS]
Referências encontradas : 1745 [refinar]
Mostrando: 1 .. 10   no formato [Detalhado]

página 1 de 175 ir para página                         

  1 / 1745 MEDLINE  
              next record last record
seleciona
para imprimir
Fotocópia
Texto completo
[PMID]:28700601
[Au] Autor:Nava A; Bondioli L; Coppa A; Dean C; Rossi PF; Zanolli C
[Ad] Endereço:Dipartimento di Biologia Ambientale, Università di Roma 'La Sapienza', Rome, Italy.
[Ti] Título:New regression formula to estimate the prenatal crown formation time of human deciduous central incisors derived from a Roman Imperial sample (Velia, Salerno, Italy, I-II cent. CE).
[So] Source:PLoS One;12(7):e0180104, 2017.
[Is] ISSN:1932-6203
[Cp] País de publicação:United States
[La] Idioma:eng
[Ab] Resumo:The characterization and quantification of human dental enamel microstructure, in both permanent and deciduous teeth, allows us to document crucial growth parameters and to identify stressful events, thus contributing to the reconstruction of the past life history of an individual. Most studies to date have focused on the more accessible post-natal portion of the deciduous dental enamel, even though the analysis of prenatal enamel is pivotal in understanding fetal growth, and reveals information about the mother's health status during pregnancy. This contribution reports new data describing the prenatal enamel development of 18 central deciduous incisors from the Imperial Roman necropolis of Velia (I-II century CE, Salerno, Italy). Histomorphometrical analysis was performed to collect data on prenatal crown formation times, daily secretion rates and enamel extension rates. Results for the Velia sample allowed us to derive a new regression formula, using a robust statistical approach, that describes the average rates of deciduous enamel formation. This can now be used as a reference for pre-industrial populations. The same regression formula, even when daily incremental markings are difficult to visualize, may provide a clue to predicting the proportion of infants born full term and pre-term in an archaeological series.
[Mh] Termos MeSH primário: Esmalte Dentário/ultraestrutura
Incisivo/ultraestrutura
Paleodontologia/métodos
Coroa do Dente/ultraestrutura
Dente Decíduo/ultraestrutura
[Mh] Termos MeSH secundário: Algoritmos
Esmalte Dentário/embriologia
Seres Humanos
Incisivo/embriologia
Mundo Romano
Coroa do Dente/embriologia
Dente Decíduo/embriologia
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Em] Mês de entrada:1709
[Cu] Atualização por classe:170926
[Lr] Data última revisão:
170926
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:170713
[St] Status:MEDLINE
[do] DOI:10.1371/journal.pone.0180104


  2 / 1745 MEDLINE  
              first record previous record next record last record
seleciona
para imprimir
Fotocópia
Ribeiro, Ana Maria
Texto completo
[PMID]:28614355
[Au] Autor:Martinelli AG; Kammerer CF; Melo TP; Paes Neto VD; Ribeiro AM; Da-Rosa ÁAS; Schultz CL; Soares MB
[Ad] Endereço:Laboratório de Paleontologia de Vertebrados, Departamento de Paleontologia e Estratigrafia, Instituto de Geociências, Universidade Federal do Rio Grande do Sul (UFRGS), Agronomia, Porto Alegre, Rio Grande do Sul, Brazil.
[Ti] Título:The African cynodont Aleodon (Cynodontia, Probainognathia) in the Triassic of southern Brazil and its biostratigraphic significance.
[So] Source:PLoS One;12(6):e0177948, 2017.
[Is] ISSN:1932-6203
[Cp] País de publicação:United States
[La] Idioma:eng
[Ab] Resumo:In this contribution we report the first occurrence of the enigmatic African probainognathian genus Aleodon in the Middle-early Late Triassic of several localities from the state of Rio Grande do Sul in southern Brazil. Aleodon is unusual among early probainognathians in having transversely-expanded postcanine teeth, similar to those of gomphodont cynognathians. This genus was previously known from the Manda Beds of Tanzania and the upper Omingonde Formation of Namibia. The Brazilian record of this genus is based upon multiple specimens representing different ontogenetic stages, including three that were previously referred to the sectorial-toothed probainognathian Chiniquodon theotonicus. We propose a new species of Aleodon (A. cromptoni sp. nov.) based on the specimens from Brazil. Additionally, we tentatively refer one specimen from the upper Omingonde Formation of Namibia to this new taxon, strengthening biostratigraphic correlations between these strata. Inclusion of A. cromptoni in a phylogenetic analysis of eucynodonts recovers it as the sister-taxon of A. brachyrhamphus within the family Chiniquodontidae. The discovery of numerous specimens of Aleodon among the supposedly monospecific Chiniquodon samples of Brazil raises concerns about chiniquodontid alpha taxonomy, particularly given the extremely broad geographic distribution of Chiniquodon. The discovery of Brazilian Aleodon and new records of the traversodontid Luangwa supports the hypothesis that at least two subzones can be recognized in the Dinodontosaurus Assemblage Zone.
[Mh] Termos MeSH primário: Dinossauros/anatomia & histologia
Dinossauros/classificação
Maxila/anatomia & histologia
[Mh] Termos MeSH secundário: Animais
Brasil
Fósseis
Namíbia
Paleodontologia
Filogenia
Tanzânia
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Em] Mês de entrada:1709
[Cu] Atualização por classe:170914
[Lr] Data última revisão:
170914
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:170615
[St] Status:MEDLINE
[do] DOI:10.1371/journal.pone.0177948


  3 / 1745 MEDLINE  
              first record previous record next record last record
seleciona
para imprimir
Fotocópia
Texto completo
[PMID]:28605019
[Au] Autor:Toussaint M; Verna C; Le Cabec A; Gómez-Robles A; Draily C; Richards MP; Pirson S
[Ad] Endereço:AWEM, 1 rue de l'Aumonier, Liège, 4000, Belgium.
[Ti] Título:The Late Neandertal permanent lower left third premolar from Walou Cave (Trooz, Belgium) and its context.
[So] Source:Am J Phys Anthropol;164(1):193-202, 2017 Sep.
[Is] ISSN:1096-8644
[Cp] País de publicação:United States
[La] Idioma:eng
[Ab] Resumo:OBJECTIVES: We describe a hominin permanent lower left third premolar unearthed in 1997 at Walou Cave (Belgium), found in direct association with a Mousterian lithic industry, in a layer directly dated to 40-38,000 years BP. MATERIALS AND METHODS: The taxonomical attribution of the tooth is addressed through comparative morphometric analyses, and stable isotope analyses aimed at determining the diet of the individual. RESULTS: The Walou P plots within the Neandertal range of variation and is significantly different from recent modern humans in all morphometric assessments. The isotope data showed that like other Neandertals, the Walou individual acquired its dietary proteins primarily from terrestrial food sources. DISCUSSION: We discuss the implications of the existence of a clearly Neandertal premolar dating to the period of the Middle to Upper Paleolithic transition in the Meuse river basin.
[Mh] Termos MeSH primário: Dente Pré-Molar/anatomia & histologia
Dente Pré-Molar/patologia
Homem de Neandertal/anatomia & histologia
[Mh] Termos MeSH secundário: Animais
Bélgica
Dieta
História Antiga
Paleodontologia
[Pt] Tipo de publicação:HISTORICAL ARTICLE; JOURNAL ARTICLE
[Em] Mês de entrada:1709
[Cu] Atualização por classe:170911
[Lr] Data última revisão:
170911
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:170613
[St] Status:MEDLINE
[do] DOI:10.1002/ajpa.23252


  4 / 1745 MEDLINE  
              first record previous record next record last record
seleciona
para imprimir
Fotocópia
Texto completo
[PMID]:28581062
[Au] Autor:Watson JT; Haas R
[Ad] Endereço:Arizona State Museum, University of Arizona, Tucson, Arizona, 85721.
[Ti] Título:Dental evidence for wild tuber processing among Titicaca Basin foragers 7000 ybp.
[So] Source:Am J Phys Anthropol;164(1):117-130, 2017 Sep.
[Is] ISSN:1096-8644
[Cp] País de publicação:United States
[La] Idioma:eng
[Ab] Resumo:OBJECTIVES: The objective of this work is to characterize dental wear in a skeletal sample dating to the Middle/Late Archaic period transition (8,000-6,700 cal. B.P.) from the Lake Titicaca Basin, Peru to better define subsistence behaviors of foragers prior to incipient sedentism and food production. MATERIALS AND METHODS: The dental sample consists of 251 teeth from 11 individuals recovered from the site of Soro Mik'aya Patjxa (SMP), the earliest securely dated burial assemblage in the Lake Titicaca Basin and the only burial assemblage in the region from an unequivocal forager context. Occlusal surface wear was quantified according to Smith (1984) and Scott (1979a) to characterize diversity within the site and to facilitate comparison with other foraging groups worldwide. General linear modeling was used to assess observation error and principal axis analysis was used to compare molar wear rates and angles. Teeth were also examined for caries and specialized wear. RESULTS: Occlusal surface attrition is generally heavy across the dental arcade and tends to be flat among posterior teeth. Only one carious lesion was observed. Five of the 11 individuals exhibit lingual surface attrition of the maxillary anterior teeth (LSAMAT). DISCUSSION: Tooth wear rates, molar wear plane, and caries rates are consistent with terrestrial foraging and a diverse diet. The presence of LSAMAT indicates tuber processing. The results therefore contribute critical new data toward our understanding of forager diet in the Altiplano prior to plant and animal domestication in the south-central Andes.
[Mh] Termos MeSH primário: Dieta/história
Comportamento Alimentar/fisiologia
Desgaste dos Dentes/patologia
[Mh] Termos MeSH secundário: Adolescente
Adulto
Bolívia
Sepultamento
Criança
Feminino
História Antiga
Seres Humanos
Masculino
Meia-Idade
Paleodontologia
Peru
Tubérculos
Adulto Jovem
[Pt] Tipo de publicação:HISTORICAL ARTICLE; JOURNAL ARTICLE
[Em] Mês de entrada:1709
[Cu] Atualização por classe:170911
[Lr] Data última revisão:
170911
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:170606
[St] Status:MEDLINE
[do] DOI:10.1002/ajpa.23261


  5 / 1745 MEDLINE  
              first record previous record next record last record
seleciona
para imprimir
Fotocópia
Texto completo
[PMID]:28573649
[Au] Autor:Pan L; Thackeray JF; Dumoncel J; Zanolli C; Oettlé A; de Beer F; Hoffman J; Duployer B; Tenailleau C; Braga J
[Ad] Endereço:Key Laboratory of Vertebrate Evolution and Human Origins of Chinese Academy of Sciences, Institute of Vertebrate Paleontology and Paleoanthropology, Chinese Academy of Sciences, Beijing, 100044, China.
[Ti] Título:Intra-individual metameric variation expressed at the enamel-dentine junction of lower post-canine dentition of South African fossil hominins and modern humans.
[So] Source:Am J Phys Anthropol;163(4):806-815, 2017 Aug.
[Is] ISSN:1096-8644
[Cp] País de publicação:United States
[La] Idioma:eng
[Ab] Resumo:OBJECTIVES: The aim of this study is to compare the degree and patterning of inter- and intra-individual metameric variation in South African australopiths, early Homo and modern humans. Metameric variation likely reflects developmental and taxonomical issues, and could also be used to infer ecological and functional adaptations. However, its patterning along the early hominin postcanine dentition, particularly among South African fossil hominins, remains unexplored. MATERIALS AND METHODS: Using microfocus X-ray computed tomography (µXCT) and geometric morphometric tools, we studied the enamel-dentine junction (EDJ) morphology and we investigated the intra- and inter-individual EDJ metameric variation among eight australopiths and two early Homo specimens from South Africa, as well as 32 modern humans. RESULTS: Along post-canine dentition, shape changes between metameres represented by relative positions and height of dentine horns, outlines of the EDJ occlusal table are reported in modern and fossil taxa. Comparisons of EDJ mean shapes and multivariate analyses reveal substantial variation in the direction and magnitude of metameric shape changes among taxa, but some common trends can be found. In modern humans, both the direction and magnitude of metameric shape change show increased variability in M -M compared to M -M . Fossil specimens are clustered together showing similar magnitudes of shape change. Along M -M , the lengths of their metameric vectors are not as variable as those of modern humans, but they display considerable variability in the direction of shape change. CONCLUSION: The distalward increase of metameric variation along the modern human molar row is consistent with the odontogenetic models of molar row structure (inhibitory cascade model). Though much remains to be tested, the variable trends and magnitudes in metamerism in fossil hominins reported here, together with differences in the scale of shape change between modern humans and fossil hominins may provide valuable information regarding functional morphology and developmental processes in fossil species.
[Mh] Termos MeSH primário: Esmalte Dentário/anatomia & histologia
Dentina/anatomia & histologia
Fósseis
Hominidae/anatomia & histologia
Dente/anatomia & histologia
[Mh] Termos MeSH secundário: Animais
Seres Humanos
Paleodontologia
Análise de Componente Principal
Microtomografia por Raio-X
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Em] Mês de entrada:1708
[Cu] Atualização por classe:170822
[Lr] Data última revisão:
170822
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:170603
[St] Status:MEDLINE
[do] DOI:10.1002/ajpa.23240


  6 / 1745 MEDLINE  
              first record previous record next record last record
seleciona
para imprimir
Fotocópia
Texto completo
[PMID]:28542710
[Au] Autor:Towle I; Irish JD; De Groote I
[Ad] Endereço:Research Centre in Evolutionary Anthropology and Palaeoecology, School of Natural Sciences and Psychology, John Moores University, Liverpool, L3 3AF, United Kingdom.
[Ti] Título:Behavioral inferences from the high levels of dental chipping in Homo naledi.
[So] Source:Am J Phys Anthropol;164(1):184-192, 2017 Sep.
[Is] ISSN:1096-8644
[Cp] País de publicação:United States
[La] Idioma:eng
[Ab] Resumo:OBJECTIVES: A variety of mechanical processes can result in antemortem dental chipping. In this study, chipping data in the teeth of Homo naledi are compared with those of other pertinent dental samples to give insight into their etiology. MATERIALS AND METHODS: Permanent teeth with complete crowns evidencing occlusal wear were examined macroscopically. The location, number, and severity of fractures were recorded and compared to those found in samples of two other South African fossil hominin species and in samples of nonhuman primates (n = 3) and recent humans (n = 7). RESULTS: With 44% of teeth affected, H. naledi exhibits far higher rates of chipping than the other fossil hominin samples. Specifically, 50% of posterior teeth and 31% of anterior teeth display at least one chip. The maxillary teeth are more affected than the mandibular teeth (45% vs 43%, respectively), 73% of molar chipping occurs on interproximal surfaces, and right teeth are more often affected than left teeth (50% vs 38%). DISCUSSION: Results indicate that the teeth of H. naledi were exposed to acute trauma on a regular basis. Because interproximal areas are more affected than buccal and posterior teeth more than anterior, it is unlikely that nonmasticatory cultural behavior was the cause. A diet containing hard and resistant food, or contaminants such as grit, is more likely. The small chip size, and steep occlusal wear and cupped dentine on some molars are supportive of the latter possibility. This pattern of chipping suggests that H. naledi differed considerably-in terms of diet, environment, and/or specialized masticatory processing-relative to other African fossil hominins.
[Mh] Termos MeSH primário: Esmalte Dentário/patologia
Dieta/história
Dente/patologia
[Mh] Termos MeSH secundário: Animais
Fósseis
História Antiga
Hominidae
Seres Humanos
Paleodontologia
África do Sul
[Pt] Tipo de publicação:HISTORICAL ARTICLE; JOURNAL ARTICLE
[Em] Mês de entrada:1709
[Cu] Atualização por classe:170911
[Lr] Data última revisão:
170911
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:170526
[St] Status:MEDLINE
[do] DOI:10.1002/ajpa.23250


  7 / 1745 MEDLINE  
              first record previous record next record last record
seleciona
para imprimir
Fotocópia
Texto completo
[PMID]:28504354
[Au] Autor:Modesto-Mata M; García-Campos C; Martín-Francés L; Martínez de Pinillos M; García-González R; Quintino Y; Canals A; Lozano M; Dean MC; Martinón-Torres M; Bermúdez de Castro JM
[Ad] Endereço:Centro Nacional de Investigación sobre la Evolución Humana (CENIEH), Burgos, 09002, Spain.
[Ti] Título:New methodology to reconstruct in 2-D the cuspal enamel of modern human lower molars.
[So] Source:Am J Phys Anthropol;163(4):824-834, 2017 Aug.
[Is] ISSN:1096-8644
[Cp] País de publicação:United States
[La] Idioma:eng
[Ab] Resumo:OBJECTIVES: In the last years different methodologies have been developed to reconstruct worn teeth. In this article, we propose a new 2-D methodology to reconstruct the worn enamel of lower molars. Our main goals are to reconstruct molars with a high level of accuracy when measuring relevant histological variables and to validate the methodology calculating the errors associated with the measurements. METHODS: This methodology is based on polynomial regression equations, and has been validated using two different dental variables: cuspal enamel thickness and crown height of the protoconid. In order to perform the validation process, simulated worn modern human molars were employed. The associated errors of the measurements were also estimated applying methodologies previously proposed by other authors. RESULTS: The mean percentage error estimated in reconstructed molars for these two variables in comparison with their own real values is -2.17% for the cuspal enamel thickness of the protoconid and -3.18% for the crown height of the protoconid. This error significantly improves the results of other methodologies, both in the interobserver error and in the accuracy of the measurements. CONCLUSIONS: The new methodology based on polynomial regressions can be confidently applied to the reconstruction of cuspal enamel of lower molars, as it improves the accuracy of the measurements and reduces the interobserver error. The present study shows that it is important to validate all methodologies in order to know the associated errors. This new methodology can be easily exportable to other modern human populations, the human fossil record and forensic sciences.
[Mh] Termos MeSH primário: Esmalte Dentário/anatomia & histologia
Dente Molar/anatomia & histologia
Paleodontologia/métodos
Coroa do Dente/anatomia & histologia
[Mh] Termos MeSH secundário: Esmalte Dentário/patologia
História Antiga
Seres Humanos
Análise de Regressão
Reprodutibilidade dos Testes
Espanha
Desgaste dos Dentes/patologia
[Pt] Tipo de publicação:HISTORICAL ARTICLE; JOURNAL ARTICLE
[Em] Mês de entrada:1708
[Cu] Atualização por classe:170822
[Lr] Data última revisão:
170822
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:170516
[St] Status:MEDLINE
[do] DOI:10.1002/ajpa.23243


  8 / 1745 MEDLINE  
              first record previous record next record last record
seleciona
para imprimir
Fotocópia
Texto completo
[PMID]:28241059
[Au] Autor:Kear BP; Larsson D; Lindgren J; Kundrát M
[Ad] Endereço:Museum of Evolution, Uppsala University, Uppsala, Sweden.
[Ti] Título:Exceptionally prolonged tooth formation in elasmosaurid plesiosaurians.
[So] Source:PLoS One;12(2):e0172759, 2017.
[Is] ISSN:1932-6203
[Cp] País de publicação:United States
[La] Idioma:eng
[Ab] Resumo:Elasmosaurid plesiosaurians were globally prolific marine reptiles that dominated the Mesozoic seas for over 70 million years. Their iconic body-plan incorporated an exceedingly long neck and small skull equipped with prominent intermeshing 'fangs'. How this bizarre dental apparatus was employed in feeding is uncertain, but fossilized gut contents indicate a diverse diet of small pelagic vertebrates, cephalopods and epifaunal benthos. Here we report the first plesiosaurian tooth formation rates as a mechanism for servicing the functional dentition. Multiple dentine thin sections were taken through isolated elasmosaurid teeth from the Upper Cretaceous of Sweden. These specimens revealed an average of 950 daily incremental lines of von Ebner, and infer a remarkably protracted tooth formation cycle of about 2-3 years-other polyphyodont amniotes normally take ~1-2 years to form their teeth. Such delayed odontogenesis might reflect differences in crown length and function within an originally uneven tooth array. Indeed, slower replacement periodicity has been found to distinguish larger caniniform teeth in macrophagous pliosaurid plesiosaurians. However, the archetypal sauropterygian dental replacement system likely also imposed constraints via segregation of the developing tooth germs within discrete bony crypts; these partly resorbed to allow maturation of the replacement teeth within the primary alveoli after displacement of the functional crowns. Prolonged dental formation has otherwise been linked to tooth robustness and adaption for vigorous food processing. Conversely, elasmosaurids possessed narrow crowns with an elongate profile that denotes structural fragility. Their apparent predilection for easily subdued prey could thus have minimized this potential for damage, and was perhaps coupled with selective feeding strategies that ecologically optimized elasmosaurids towards more delicate middle trophic level aquatic predation.
[Mh] Termos MeSH primário: Dentição
Odontogênese
Répteis/anatomia & histologia
Dente/anatomia & histologia
[Mh] Termos MeSH secundário: Animais
Evolução Biológica
Ecologia
Comportamento Alimentar
Fósseis
Paleodontologia
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Em] Mês de entrada:1709
[Cu] Atualização por classe:170907
[Lr] Data última revisão:
170907
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:170228
[St] Status:MEDLINE
[do] DOI:10.1371/journal.pone.0172759


  9 / 1745 MEDLINE  
              first record previous record next record last record
seleciona
para imprimir
Fotocópia
Texto completo
[PMID]:28222163
[Au] Autor:Laffoon JE; Sonnemann TF; Shafie T; Hofman CL; Brandes U; Davies GR
[Ad] Endereço:Faculty of Earth and Life Sciences, Vrije Universiteit, Amsterdam, The Netherlands.
[Ti] Título:Investigating human geographic origins using dual-isotope (87Sr/86Sr, δ18O) assignment approaches.
[So] Source:PLoS One;12(2):e0172562, 2017.
[Is] ISSN:1932-6203
[Cp] País de publicação:United States
[La] Idioma:eng
[Ab] Resumo:Substantial progress in the application of multiple isotope analyses has greatly improved the ability to identify nonlocal individuals amongst archaeological populations over the past decades. More recently the development of large scale models of spatial isotopic variation (isoscapes) has contributed to improved geographic assignments of human and animal origins. Persistent challenges remain, however, in the accurate identification of individual geographic origins from skeletal isotope data in studies of human (and animal) migration and provenance. In an attempt to develop and test more standardized and quantitative approaches to geographic assignment of individual origins using isotopic data two methods, combining 87Sr/86Sr and δ18O isoscapes, are examined for the Circum-Caribbean region: 1) an Interval approach using a defined range of fixed isotopic variation per location; and 2) a Likelihood assignment approach using univariate and bivariate probability density functions. These two methods are tested with enamel isotope data from a modern sample of known origin from Caracas, Venezuela and further explored with two archaeological samples of unknown origin recovered from Cuba and Trinidad. The results emphasize both the potential and limitation of the different approaches. Validation tests on the known origin sample exclude most areas of the Circum-Caribbean region and correctly highlight Caracas as a possible place of origin with both approaches. The positive validation results clearly demonstrate the overall efficacy of a dual-isotope approach to geoprovenance. The accuracy and precision of geographic assignments may be further improved by better understanding of the relationships between environmental and biological isotope variation; continued development and refinement of relevant isoscapes; and the eventual incorporation of a broader array of isotope proxy data.
[Mh] Termos MeSH primário: Esmalte Dentário/química
Migração Humana/história
Isótopos de Oxigênio/análise
Paleodontologia/métodos
Isótopos de Estrôncio/análise
[Mh] Termos MeSH secundário: Adulto
Dente Pré-Molar/química
Região do Caribe
Criança
Cuba
Feminino
História Antiga
Seres Humanos
Funções Verossimilhança
Modelos Teóricos
Trinidad e Tobago
Venezuela
[Pt] Tipo de publicação:COMPARATIVE STUDY; HISTORICAL ARTICLE; JOURNAL ARTICLE
[Nm] Nome de substância:
0 (Oxygen Isotopes); 0 (Strontium Isotopes)
[Em] Mês de entrada:1708
[Cu] Atualização por classe:170817
[Lr] Data última revisão:
170817
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:170222
[St] Status:MEDLINE
[do] DOI:10.1371/journal.pone.0172562


  10 / 1745 MEDLINE  
              first record previous record
seleciona
para imprimir
Fotocópia
Texto completo
[PMID]:28075026
[Au] Autor:Reid DJ; Guatelli-Steinberg D
[Ad] Endereço:The George Washington University, Washington, DC, 20052.
[Ti] Título:Updating histological data on crown initiation and crown completion ages in southern Africans.
[So] Source:Am J Phys Anthropol;162(4):817-829, 2017 Apr.
[Is] ISSN:1096-8644
[Cp] País de publicação:United States
[La] Idioma:eng
[Ab] Resumo:OBJECTIVES: To update histological data on crown initiation and completion ages in southern Africans. To evaluate implications of these data for studies that: (a) rely on these data to time linear enamel hypoplasias (LEHs), or, (b) use these data for comparison to fossil hominins. MATERIALS AND METHODS: Initiation ages were calculated on 67 histological sections from southern Africans, with sample sizes ranging from one to 11 per tooth type. Crown completion ages for southern Africans were calculated in two ways. First, actual derived initiation ages were added to crown formation times for each histological section to obtain direct information on the crown completion ages of individuals. Second, average initiation ages from this study were added to average crown formation times of southern Africans from the Reid and coworkers previous studies that were based on larger samples. RESULTS: For earlier-initiating tooth types (all anterior teeth and first molars), there is little difference in ages of initiation and crown completion between this and previous studies. Differences increase as a function of initiation age, such that the greatest differences between this and previous studies for both initiation and crown completion ages are for the second and third molars. DISCUSSION: This study documents variation in initiation ages, particularly for later-initiating tooth types. It upholds the use of previously published histological aging charts for LEHs on anterior teeth. However, this study finds that ages of crown initiation and completion in second and third molars for this southern African sample are earlier than previously estimated. These earlier ages reduce differences between modern humans and fossil hominins for these developmental events in second and third molars.
[Mh] Termos MeSH primário: Fósseis
Hominidae/anatomia & histologia
Coroa do Dente/anatomia & histologia
Dente/anatomia & histologia
[Mh] Termos MeSH secundário: Animais
Antropologia Física
Pré-Escolar
História Antiga
Hominidae/crescimento & desenvolvimento
Seres Humanos
Paleodontologia
África do Sul
Dente/crescimento & desenvolvimento
Coroa do Dente/crescimento & desenvolvimento
[Pt] Tipo de publicação:HISTORICAL ARTICLE; JOURNAL ARTICLE
[Em] Mês de entrada:1706
[Cu] Atualização por classe:170620
[Lr] Data última revisão:
170620
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:170112
[St] Status:MEDLINE
[do] DOI:10.1002/ajpa.23173



página 1 de 175 ir para página                         
   


Refinar a pesquisa
  Base de dados : MEDLINE Formulário avançado   

    Pesquisar no campo  
1  
2
3
 
           



Search engine: iAH v2.6 powered by WWWISIS

BIREME/OPAS/OMS - Centro Latino-Americano e do Caribe de Informação em Ciências da Saúde