Articles de revues : « Materiali Dentari »

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AA VV, AA VV. « Dental materials/Materiali dentari ». Dental Cadmos 01, n^o 01 (juillet 2022) : 135. http://dx.doi.org/10.19256/abstract.cduo.08.2022.

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Schulp, A. S., N. Bardet et B. Bouya. « A new species of the durophagous mosasaur Carinodens (Squamata, Mosasauridae) and additional material of Carinodens belgicus from the Maastrichtian phosphates of Morocco ». Netherlands Journal of Geosciences - Geologie en Mijnbouw 88, n^o 3 (novembre 2009) : 161–67. http://dx.doi.org/10.1017/s0016774600000871.

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AbstractFive new dentaries, representing three individuals of the poorly known durophagous mosasaur Carinodens are described from the Maastrichtian phosphates of Morocco. Contrary to previous assumptions, the dentary of Carinodens holds 17-18 teeth, rather than 13. One pair of dentaries represents a new species, Carinodens minalmamar, characterised by laterally flattened teeth with two relatively pronounced sulci, a tooth count of 18, and a more slender general aspect of the dentary itself. The new material requires adjustment of previous reconstructions, assumptions on jaw mechanics, and palaeobiological interpretations of Carinodens.

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Chávez-Alayo, Pablo A., Martin Kcomt-Yep, Arturo Kobayashi-Shinya et José Balerezo-Razzeto. « Resistencia a la tracción de coronas cementadas con ionómero de vidrio en dos preparaciones dentarias ». Revista Estomatológica Herediana 23, n^o 3 (2 avril 2014) : 117. http://dx.doi.org/10.20453/reh.v23i3.21.

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El objetivo: del presente estudio fue evaluar el efecto del tipo de superficie de la preparación dentaria en relación a la resistencia a la tracción de coronas metálicas completas cementadas con ionómero de vidrio sobre preparaciones dentarias con superficies pulidas y no pulidas. Material y métodos: Se realizaron 20 coronas metálicas en 20 piezas dentarias preparadas, las cuales se dividieron en dos grupos de 10 cada una, éstas fueron sometidas a la prueba de tracción con la máquina de tracción Hounsfield, para determinar la fuerza de tracción necesaria para dislocarla. Resultados: mostraron que las preparaciones dentarias con superficies no pulidas (607.03N) mejoran la resistencia a la tracción en comparación de las pulidas (359.90 N.)

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MCDONALD, ANDREW T., PAUL M. BARRETT et SANDRA D. CHAPMAN. « A new basal iguanodont (Dinosauria : Ornithischia) from the Wealden (Lower Cretaceous) of England ». Zootaxa 2569, n^o 1 (17 août 2010) : 1. http://dx.doi.org/10.11646/zootaxa.2569.1.1.

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A nearly complete right dentary originally noted by Mantell in 1848 is redescribed. The specimen, NHMUK 28660, was discovered in a quarry near Cuckfield, West Sussex, from the same formation as the original teeth of Iguanodon anglicus. Fresh examination reveals that NHMUK 28660 exhibits a single autapomorphy (a row of foramina extending from the ventral surface of the symphysis onto the lateral surface of the dentary) and a unique combination of characters that distinguish it from all other iguanodontian dentaries. In light of this and because I. anglicus is regarded as a nomen dubium to which additional material cannot be unambiguously referred, NHMUK 28660 is made the holotype of the new genus and species Kukufeldia tilgatensis.

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Gutierrez-Ventura, Fredy, et Yarim Tataje Vivanco. « Posición del agujero dentario inferior en la rama ascendente en huesos mandibulares secos de adultos ». Revista Estomatológica Herediana 22, n^o 3 (20 mai 2014) : 152. http://dx.doi.org/10.20453/reh.v22i3.115.

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Objetivos: El presente estudio consistió en observar y definir la ubicación del agujero dentario inferior en la rama ascendente de 53 mandíbulas secas de adultos. Material y métodos: La muestra fue recolectada del laboratorio de anatomía de la Facultad de Estomatología de la UPCH. Se evaluó y midió las distancias del agujero dentaria inferior hacia los bordes limitantes de la rama mandibular, es decir la distancia anterior, posterior, superior e inferior y establecer relación entre las medidas obtenidas de la rama derecha e izquierda. Resultados: Los resultados fueron para la distancia anterior 1.72cm en la rama derecha y 1.68 cm en la rama izquierda; para la distancia posterior 1.40 cm en la rama derecha y 1.39 en la rama izquierda; para la distancia superior 1.77 cm en la rama derecha y 1.74cm en la rama izquierda; para la distancia inferior 2.48cm en la rama derecha y 2.45 cm en la rama izquierda. Conclusiones: Se hallaron diferencias estadísticamente significativas para las distancias anterior, superior e inferior.

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Soancă, A., A. Roman, D. Condor, C. Cioban et Ş. A. Petruţiu. « Influence of some dental biomaterials on periodontal tissue ». Romanian Journal of Stomatology 61, n^o 2 (30 juin 2015) : 149–55. http://dx.doi.org/10.37897/rjs.2015.2.7.

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Dental biomaterials are designed to restore form and function of the dental tissue, to protect the remaining tissue and to create a bond between the dental surface and the restorative material. Due to their proximity to dental structures and oral mucosa, dental biomaterials must fulfil the requirements of biocompatibility and biological durability. The research in the field is focused on achieving these requirements by developing new highly performant biomaterials. But at present, composite materials still present some drawbacks like the polymerisation shrinkage associated to the curing process that leads to the adhesive interface breakdown and marginal microleakage. Composite materials may release substances into the oral environment during setting and later as a result of material degradation. Different side effects of composite materials and their components have been reported i.e. cytotoxic, teratogenic, carcinogenic, mutagenic or genotoxic. Despite the developments in the field, at present no „ideal“ restorative biomaterial with similar characteristics with the natural teeth and completely biocompatible is available. However, the application of strict clinical protocols may improve the above mentioned shortcomings.

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Mayancela, Jorge Leonidas, et Alberto Leoncio Alvarado. « Anomalías dentarias de número, presentes en pacientes con labio y paladar fisurado, de 6 a 12 años de edad. Revisión de literatura. » Odontología Activa Revista Científica 6, n^o 3 (23 septembre 2021) : 23–30. http://dx.doi.org/10.31984/oactiva.v6i3.620.

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Resumen La Fisura de labio y paladar (LPF), es una malformación cráneo-facial congénita; que provoca alteraciones estéticas y funcionales a nivel bucofacial, lo cual origina problemas de alimentación, fonación, audición, entre otros. Uno de los grandes problemas presentes en estos pacientes son las alteraciones a nivel de los órganos dentarios de los cuales destacan las anomalías dentarias de número reportados como las más prevalentes en pacientes con LPF. Objetivo: Obtener información sistematizada y actualizada referente a las anomalías dentarias de número (agenesia y dientes supernumerarios), presentes en pacientes con LPF de 6 a 12 año de edad. Discusión: La literatura reporta una evidente prevalencia mayoritaria de anomalías dentales en pacientes con LPF, que en la población en general autores como Renfigo H. Vigueras O. De Stefani A; entre otros, coinciden en sus investigaciones, mencionando que las principales anomalías dentales presentes en pacientes con LPF son las agenesia y dientes supernumerarios, (anomalías dentarias de número). Conclusión: La agenesia dental ocupa la anomalía dental más prevalente en individuos con labio y paladar fisurado, seguida del diente supernumerario, estas dos alteraciones dentales de acuerdo a diferentes estudios originales ocupan los primeros puestos en cuanto a prevalencia.

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Mayancela, Jorge Leonidas, et Alberto Leoncio Alvarado. « Anomalías dentarias de número, presentes en pacientes con labio y paladar fisurado, de 6 a 12 años de edad. Revisión de literatura. » Odontología Activa Revista Científica 6, n^o 3 (23 septembre 2021) : 23–30. http://dx.doi.org/10.31984/oactiva.v6i3.620.

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Resumen La Fisura de labio y paladar (LPF), es una malformación cráneo-facial congénita; que provoca alteraciones estéticas y funcionales a nivel bucofacial, lo cual origina problemas de alimentación, fonación, audición, entre otros. Uno de los grandes problemas presentes en estos pacientes son las alteraciones a nivel de los órganos dentarios de los cuales destacan las anomalías dentarias de número reportados como las más prevalentes en pacientes con LPF. Objetivo: Obtener información sistematizada y actualizada referente a las anomalías dentarias de número (agenesia y dientes supernumerarios), presentes en pacientes con LPF de 6 a 12 año de edad. Discusión: La literatura reporta una evidente prevalencia mayoritaria de anomalías dentales en pacientes con LPF, que en la población en general autores como Renfigo H. Vigueras O. De Stefani A; entre otros, coinciden en sus investigaciones, mencionando que las principales anomalías dentales presentes en pacientes con LPF son las agenesia y dientes supernumerarios, (anomalías dentarias de número). Conclusión: La agenesia dental ocupa la anomalía dental más prevalente en individuos con labio y paladar fisurado, seguida del diente supernumerario, estas dos alteraciones dentales de acuerdo a diferentes estudios originales ocupan los primeros puestos en cuanto a prevalencia.

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Evans, David C., Thomas M. Cullen, Derek W. Larson et Adam Rego. « A new species of troodontid theropod (Dinosauria : Maniraptora) from the Horseshoe Canyon Formation (Maastrichtian) of Alberta, Canada ». Canadian Journal of Earth Sciences 54, n^o 8 (août 2017) : 813–26. http://dx.doi.org/10.1139/cjes-2017-0034.

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Troodontid material from the Maastrichtian of North America is extremely rare, beyond isolated teeth from microvertebrate sites. Here we describe troodontid frontals from the early Maastrichtian Horseshoe Canyon Formation (Horsethief Member). The most complete specimen, TMP 1993.105.0001, is notably foreshortened and robust when compared with numerous specimens referred to Troodon from the Dinosaur Park Formation, and exhibits several characteristics that distinguish it from other Late Cretaceous troodontids. Morphometric analyses reinforce shape differences between TMP 1993.105.0001 and other North American troodontids, and show that proportional differences are independent of size. We therefore erect a new taxon, Albertavenator curriei gen. et sp. nov., which is diagnosed by the following autapomorphies: (1) primary supraciliary foramen is truncated anteriorly by the lacrimal contact; (2) superficial (ectocranial) surface of the frontal proportionally shorter than all known troodontids, with a length to width ratio under 1.3; and (3) frontoparietal contact in which an enlarged lappet of the frontal extends medially to extensively overlap the lateral region of the anteromedial process of the parietal. Interestingly, tooth and jaw morphology from the single relatively complete dentary recovered from the Horseshoe Canyon cannot be distinguished from dentaries and teeth from the Dinosaur Park Formation. If the dentary and teeth from the Horsethief Member of the Horseshoe Canyon Formation prove to belong to A. curriei, extensive overlap in tooth morphology between the Dinosaur Park and Horseshoe Canyon formations reinforces the notion that tooth morphotypes do not exhibit strong correspondence to species alpha diversity, and may encompass multiple closely related taxa.

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Skutschas, P. P., et S. A. Krasnolutskii. « A new genus and species of basal salamanders from the Middle Jurassic of Western Siberia, Russia ». Proceedings of the Zoological Institute RAS 315, n^o 2 (25 juin 2011) : 167–75. http://dx.doi.org/10.31610/trudyzin/2011.315.2.167.

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A new basal stem salamander, Urupia monstrosa gen. et sp. nov., is described based on an atlantal centrum (holotype), fragments of trunk vertebrae, and some associated elements (fragmentary dentaries and a femur) from the Middle Jurassic (Bathonian) Itat Formation of Krasnoyarsk Territory in Western Siberia, Russia. The new taxon is characterized by the following combination of characters: lack of the spinal nerve foramina in the atlas, presence atlantal transverse processes and a deep depression on the ventral surface of the atlas; lateral surface of anterior part of the dentary is sculptured by oval and rounded pits; very short diaphyseal part of femur. The absence of intercotylar tubercle on the atlas and presence of atlantal transverse processes support for neotenic nature of Urupia monstrosa gen. et sp. nov. Large size, presence of sculpture on vertebrae, and the absence of spinal nerve foramina in the atlas suggest that Urupia monstrosa gen. et sp. nov. is a stem group salamander. The phylogenetic relationships of Urupia monstrosa gen. et sp. nov. with other stem group salamanders cannot be established on the available material.

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Demetska, A. V., K. D. Kopach et T. Yu Tkachenko. « Risk assessment and control in using modern dental materials ». Ukrainian Journal of Occupational Health 2017, n^o 2 (30 juin 2017) : 55–58. http://dx.doi.org/10.33573/ujoh2017.02.055.

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Peterson, Jill, Qian Wang et Paul C. Dechow. « Material properties of the dentate maxilla ». Anatomical Record Part A : Discoveries in Molecular, Cellular, and Evolutionary Biology 288A, n^o 9 (2006) : 962–72. http://dx.doi.org/10.1002/ar.a.20358.

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TAWFIQ, NADIA, et ALI KHALID. « EVALUATION OF THE EFFECT OF SOME DENTURE CLEANSERS ON THE HARDNESS OF TWO DENTURE BASE MATERIALS ». Journal of The University of Duhok 22, n^o 1 (26 janvier 2020) : 21–29. http://dx.doi.org/10.26682/sjuod.2020.22.1.3.

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Hall, Jean P., et Donald L. Wolberg. « A new Late Cretaceous (Campanian–Maastrichtian) amiid (Halecomorphi : Actinopterygii) from the Fruitland Formation, San Juan Basin, New Mexico ». Journal of Paleontology 63, n^o 1 (janvier 1989) : 108–15. http://dx.doi.org/10.1017/s0022336000041020.

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Amia? chauliodeia, a new amiid fish from the Late Cretaceous Fruitland Formation of the San Juan Basin, New Mexico, is described from material that includes vertebral centra, elements of the mandibular arch, dermal skull roof, palatal complex, hyoid arch, pectoral girdle, branchial apparatus, ribs, and both pelvic basipterygia. The new form differs from previously described amiiforms in the length of the dentary tooth row, in the anterior thickness of the dentary, and in the apparent lack of internal sensory canals in the dentary and angular. The New Mexico amiid also retains a primitive metapterygoid. Although the new form shares several features in common with the Late Cretaceous amiid Melvius thomasi described by Bryant (1987), it is unquestionably distinct from this form. Material from the Fruitland and Kirtland Formations of New Mexico referred by Bryant (1987) to M. thomasi is now included within Amia? chauliodeia.

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Mkhitaryan, T. G., et A. O. Averianov. « New material and phylogenetic position of Aidachar paludalis Nesov, 1981 (Actinopterygii, Ichthyodectiformes) from the Late Cretaceous of Uzbekistan ». Proceedings of the Zoological Institute RAS 315, n^o 2 (25 juin 2011) : 181–92. http://dx.doi.org/10.31610/trudyzin/2011.315.2.181.

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Aidachar paludalis Nesov, 1981 from the Upper Cretaceous (Turonian) Bissekty Formation of Uzbekistan is referable to the teleost order Ichthyodectiformes by combination of the following diagnostic characters: large and massive intercalar, forming part of the hyomandibular facet and a canal for the jugular vein; deep premaxillamaxilla attachment; deep dentary symphysis; angled coronoid process of the dentary; teeth forming a single series in the jaws. It shares a unique character with Aidachar pankowskii (Forey et Cavin, 2007), comb. nov., from the Cenomanian of Morocco: hyomandibular facet clearly divided into two parts.

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Sfarghiu, Lorelai Georgeta, Sorin Popşor, Viorel Ştefan Perieanu, Mariana Păcurar, Anca Temelcea, Ileana Ionescu, Oana Eftene, Liliana Burlibaşa, Mădălina Perieanu et Mihai Burlibaşa. « Clinical and microbiological study of bacterial contamination of frequently used dental impression materials ». Romanian Medical Journal 63, n^o 1 (31 mars 2016) : 24–30. http://dx.doi.org/10.37897/rmj.2016.1.6.

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Mass distribution of different infectious diseases appears even more likely in dentistry than other medical specialities. The purpose of the study is to examine different impressions with alginate materials in order to demonstrate the contamination with different pathogens. Material and method. 63 patients were included in this study. They required specific prosthetic treatment. Preliminary impression were obtained with irreversible hydrocolloid material and microbiologically tested shorthy after removal from the mouth, after washed throughly with cold water and after decontamination with specific desinfectants. Results. Microbiologic records on the alginate impressions in different stages, revealed a reduction in number of bacteria, but not completely absence, regardless of the type of decontamination substance. Conclusions. The presence of different pathogens on the surface of irreversible hydrocolloid impresions is certain. There are residual bacteria which differ from one substance to another, irrespective of cleaning stages and decontamination materials used in daily manipulation of dental impresion. Even if time consuming, decontamination of alginate impression is compulsory in dentistry.

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Amuli, Xhuena, et Valbona Disha. « Herbalizmi dentar ». Optime 12, n^o 1-2 (23 octobre 2021) : 48–57. http://dx.doi.org/10.55312/op.v12i1-2.174.

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Kurimi i patologjive të ndryshme shëndetësore nëpërmjet bimëve tashmë njihet në të gjithë botën. Janë të njohura efektet e tyre antimikrobiale, antifungal, antivirale etj., veti këto që mund të shfrytëzohen për të trajtuar patologji edhe në kavitetin oral. Nga ana tjetër, kur krahasohen me medikamentet, bimët janë më të sigurta në përdorim dhe më me pak efekte anësore. Qëllimi. Si ndikon në reduktimin e pllakës dentare dhe kariesin dentar përdorimi i disa bimëve (kanellës, stivias, propolisit dhe lëkurës së portokallit). Materiale dhe metoda. Ky studim është një rishikim literature, në vetvete kualitativ, duke qenë se është bazuar në literaturë ekzistuese. Duke përdorur fjalët kyçe për kërkimin e artikujve në lidhje me temën, u shfaqën rreth 500 artikuj. Nga këto u zgjodhën 8 artikuj që u shfrytëzuan për qëllimin e studimit. Artikujt e përzgjedhur përfshinin studime në lidhje me bimët e interesit dhe me efektet që ato kanë në pllakë dhe inhibimin e evolucionit të kariesit. Artikujt i përkasin viteve të fundit dhe trajtojnë studime in vivo/in vitro që janë kryer duke përdorur bimët e interesit. Rezultate. Aprovimi i potencialeve në frenimin e aktivitetit mikrobial dhe reduktimin e akumulimit të pllakës patogjene në kavitetin oral, janë disa nga rezultatet e këtij studimi. Interesant është fakti që studiues të ndryshëm kanë nxjerrë rezultate të përafërta me njëri tjetrin lidhur me vetitë pozitive të bimëve të interesit. Konkluzione. Është i padiskutueshëm fakti që bimët kanë pranueshmëri më të mirë nga ana e pacientit dhe më pak efekte anësore. Studimet e kryera kanë lënë rrugë të hapur drejt mundësive të përfshirjes së bimëve të interesit në produktet e higjenës orale. Mungesa e standardizmit të kësaj disipline dhe e një instituti kërkimor përbën kufizim për këtë punë kërkimore.

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Belbey (h), Horacio Ricardo, Alina Noelia Peláez, Fernando Ludovico Belbey et Horacio Ricardo Belbey. « Tratamiento protético alternativo frente a un mal pronóstico ». Revista de la Facultad de Odontología 4, n^o 1 (21 novembre 2011) : 53. http://dx.doi.org/10.30972/rfo.41986.

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El presente trabajo tiene como finalidad exponer el caso de un paciente de sexo femenino de 14 años de edad, con una técnica no convencional para la rehabilitación funcional y estética de una pieza dentaria anterior, la cual se presentaba con un mal pronóstico tanto clínico como radiográfico, debido a una deficiente obturación de la pieza dentaria a nivel apical, con extravasación del material sellador hacia una de las paredes del conducto, suponiendo la presencia de una falsa vía. Se pudo constatar también, el gran debilitamiento radicular producto del escaso espesor de la pared dentinaria y su amplio espacio radicular, además de la escasa proporción coronoradicular. Asimismo la edad, el criterio clínico y el requisito estético influyeron en la decisión de un tratamiento conservador, evitando la exodoncia de la pieza dentaria, optando por un retratamiento endodóntico con MTA (agregado de trióxido mineral) como material obturador del tercio apical y un tratamiento protésico, mediante la utilización de tres postes de fibra de vidrio.

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Piotrowski, Andreas, Volker Kahlenberg et Reinhard X. Fischer. « Mixed phosphate-sulfate fluor apatites as possible materials in dental fillers ». European Journal of Mineralogy 16, n^o 2 (29 mars 2004) : 279–84. http://dx.doi.org/10.1127/0935-1221/2004/0016-0279.

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Díaz-Orahulio, Gabriela Dayanna, et Roberto Antonio León-Manco. « Estado nutricional y secuencia de erupción dentaria en niños menores de 12 años de edad - Aldea Infantil SOS Pachacámac – Lima, Perú ». Revista Estomatológica Herediana 24, n^o 4 (16 décembre 2014) : 213. http://dx.doi.org/10.20453/reh.v24i4.2163.

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Objetivo: Describir la asociación entre el estado nutricional y secuencia de erupción dentaria en niños menores de 12 años de edad de la Aldea Infantil SOS Pachacámac, Distrito de Pachacámac, Lima - Perú, en el año 2013. Material y Métodos: Estudio transversal, observacional, descriptivo y retrospectivo. Se examinaron 37 datos de niños de 3 a 12 años de edad de la base de datos de la Aldea Infantil SOS Pachacámac del Departamento Académico de Odontología Social de la Facultad de Estomatología Roberto Beltrán, Universidad Peruana Cayetano Heredia (Lima, Perú), en donde se encontró información de edad, sexo, talla, peso y secuencia de erupción dentaria de los niños examinados. Resultados: Del total de niños, se encontró que 34 (91.9%) presentaron desnutrición y 8 (21.6%) alteración en la secuencia de erupción dentaria. No se encontró asociación estadísticamente significativa entre estas variables. Conclusión: No existió asociación entre estado nutricional y secuencia de erupción dentaria en niños menores de 12 años de edad de la Aldea Infantil SOS Pachacámac, Distrito de Pachacámac, Lima - Perú, evaluados el año 2013.

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Hrab, Dana, Andrea Maria Chisnoiu, Mindra Eugenia Badea, Marioara Moldovan et Radu Marcel Chisnoiu. « COMPARATIVE RADIOGRAPHIC ASSESSMENT OF A NEW BIOCERAMIC-BASED ROOT CANAL SEALER ». Medicine and Pharmacy Reports 90, n^o 2 (26 avril 2017) : 226–30. http://dx.doi.org/10.15386/cjmed-714.

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Background and aims. The aim of this study was to assess the radiopacity of two bioceramic-based root canal sealers, the conventional TotalFill BC sealer (FKG Dentaire Switzerland) and a new experimental filling material developed in collaboration with 'Raluca Ripan' Institute for Research in Chemistry, Cluj-Napoca. Methods. Five disc samples were prepared using both materials (10 mm diameter x 1 mm thickness), being subjected to digital radiography together with aluminum step wedges (1 to 12 mm in thickness), in accordance with ISO 6876: 2012. Radiopacity was determined by the computer analysis of the images obtained. Four different areas were selected for each sample, corresponding to a disk-sample quadrant. Statistical analysis was performed using ANOVA.Results. Both materials showed a radiopacity that was 3 mm greater than the equivalent thickness of aluminum. Total Fill BC showed greater radiopacity than the experimental material, but the differences were not statistically significant. Conclusions. Both materials comply with ISO 6876: 2012 recommendations on minimum radiopacity.

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Cuesta Ruíz-Colmenares, Miguel Angel, Emiliano Jiménez Fuentes et Pilar Julia Pérez Pérez. « Un caso de hipodoncia en un lofiodóntido (Perissodactyla, Mammalia) del Eoceno Medio de la Cuenca del Duero (Castilla y León, España). Interpretación a luz de la agenesia dentaria humana ». Spanish Journal of Palaeontology 19, n^o 2 (3 mars 2021) : 145. http://dx.doi.org/10.7203/sjp.19.2.20529.

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Se describe un caso de hipodoncia, un tipo de agenesia dentaria, en un lofiodóntido (Perissodactyla, Mammalia) procedente del Eoceno medio de la cuenca del Duero (Castilla y León, Spain). El material fósil consiste en una mandíbula con todos los dientes provistos de un acusado desgaste a excepción del P/4 izquierdo; esta condición debe ser explicada por la ausencia del correspondiente P4/ izquierdo. La hipodoncia es una anomalía relativamente frecuente en el desarrollo dental humano y es frecuente en otras especies de mamíferos. La herencia parece ser el principal factor implicado en la agenesia dentaria.

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Musser, A. M., et M. Archer. « New information about the skull and dentary of the Miocene platypus Obdurodon dicksoni , and a discussion of ornithorhynchid relationships ». Philosophical Transactions of the Royal Society of London. Series B : Biological Sciences 353, n^o 1372 (29 juillet 1998) : 1063–79. http://dx.doi.org/10.1098/rstb.1998.0266.

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A reconstruction of the skull, dentary and dentition of the middle Miocene ornithorhynchid Obdurodon dicksoni has been made possible by acquisition of nearly complete cranial and dental material. Access to new anatomical work on the living platypus, Ornithorhynchus anatinus , and the present comparative study of the cranial foramina of Ob. dicksoni and Or. anatinus have provided new insights into the evolution of the ornithorhynchid skull. The hypertrophied bill in Ob. dicksoni is seen here as possibly apomorphic, although evidence from ontogenetic studies of Or. anatinus suggests that the basic form of the bill in Ob. dicksoni (where the rostral crura meet at the midline) may be ancestral to the form of the bill in Or. anatinus (where the rostral crura meet at the midline in the embryonic platypus but diverge in the adult). Differences in the relative positions of cranial structures, and in the relationships of certain cranial foramina, indicate that the cranium may have become secondarily shortened in Or. anatinus , possibly evolving from a more elongate skull type such as that of Ob. dicksoni . The plesiomorphic dentary of Ob. dicksoni , with well–developed coronoid and angular processes, contrasts with the dentary of Or. anatinus , in which the processes are almost vestigial, as well as with the dentary of the late Oligocene, congeneric Ob. insignis , in which the angular process appears to be reduced (the coronoid process is missing). In this regard the dentary of Ob. insignis seems to be morphologically closer to Or. anatinus than is the dentary of the younger Ob. dicksoni . Phylogenetic conclusions differ from previous analyses in viewing the northern Australian Ob. dicksoni as possibly derived in possessing a hypertrophied bill and dorsoventrally flattened skull and dentary, perhaps being a specialized branch of the Obdurodon line rather than ancestral to species of Ornithorhynchus . The presence of functional teeth and the robust, flattened skull and dentary in Ob. dicksoni argue for differences in diet and lifestyle between this extinct ornithorhynchid and the living Ornithorhynchus .

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Mann, Arjan, David Rudkin, David C. Evans et Marc Laflamme. « A large onychodontiform (Osteichthyes : Sarcopterygii) apex predator from the Eifelian-aged Dundee Formation of Ontario, Canada ». Canadian Journal of Earth Sciences 54, n^o 3 (mars 2017) : 233–41. http://dx.doi.org/10.1139/cjes-2016-0119.

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The Devonian marine strata of southwestern Ontario, Canada, have been well documented geologically, but their vertebrate fossils are poorly studied. Here we report a new onychodontiform (Osteichthyes, Sarcopterygii) Onychodus eriensis n. sp. from the Dundee Formation (Eifelian–Givetian boundary, 390–387 Ma) of southwestern Ontario represented by two well-preserved onychodontiform lower jaws. The most complete specimen consists of a large (28 cm), well-preserved right jaw with most of the dentition present. The dentary has 50 teeth, not including the parasymphysial tusk whorl, which is poorly preserved but consists of at least three tusks. The anteriormost teeth of the dentary are also not complete, but the second dentary tooth is notably procurved. The posterior teeth are conical and approximately equal in size for much of the length of the tooth row. Onychodus eriensis n. sp. differs from the closely related contemporary species Onychodus sigmoides and all other onychodonts in that it has a strong dorsal curvature of the anterior dentary ramus and marked anterior expansion of the dentary. An expanded phylogenetic analysis of Devonian onychodontiforms suggests that O. eriensis is closely related to Onychodus jandamarrai. The new material indicates that Onychodontiformes is more diverse than previously recognized, and that further analysis of vertebrate remains from southwestern Ontario will lead to additional insights into the diversity of Devonian sarcopterygians.

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A. Younus, Sanarya, et Neda M. AL-Kaisy. « Effects of Short and Long-Term Immersion in Denture Cleansers on the Dimensional Stability of Acrylic Denture Base Material ». Sulaimani dental journal 7, n^o 1 (15 juin 2020) : 49–57. http://dx.doi.org/10.17656/sdj.10106.

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Rosales Ventura, Frescia Maryorie, César A. Gallardo Gutiérrez, Miguel Angel Cabrera Iberico, Lourdes Rocío Ayarza Flórez et Carmen Rosa García Rupaya. « Reabsorción cervical externa por filtración de un material aclarante ». Revista Científica Odontológica 8, n^o 2 (25 août 2020) : e021. http://dx.doi.org/10.21142/2523-2754-0802-2020-021.

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La reabsorción cervical externa es un proceso patológico con una etiología no comprendida en su totalidad. Los posibles factores predisponentes son el tratamiento de ortodoncia, los traumatismos, el blanqueamiento interno, el bruxismo, entre otros. El blanqueamiento interno es una forma efectiva y mínimamente invasiva de blanquear dientes no vitales, con un riesgo asociado con reabsorción, que al no ser tratado podría provocar incluso la pérdida dentaria. Este reporte de caso describe el manejo de dos incisivos superiores con reabsorciones cervicales externas, que tienen como antecedente tratamiento de conducto y blanqueamiento interno.

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Ryan, Michael J., et Philip J. Currie. « First report of protoceratopsians (Neoceratopsia) from the Late Cretaceous Judith River Group, Alberta, Canada ». Canadian Journal of Earth Sciences 35, n^o 7 (1 juillet 1998) : 820–26. http://dx.doi.org/10.1139/e98-033.

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Protoceratopsians are best known in North America from associated skeletal material of Montanoceratops from the early Maastrichtian of Montana and Campanian of Alberta and Leptoceratops from the late Maastrichtian of Alberta and Wyoming. We report here the first occurrence of protoceratopsian elements from the middle Campanian (Dinosaur Park Formation) of Alberta. The specimens consist of a fragmentary right dentary and an almost complete left dentary which can be referred to Leptoceratops sp. Recent examination of Albertan microvertebrate material has identified cf. protoceratopsians teeth from the latest Santonian (Milk River Formation), extending the record of Albertan protoceratopsians back almost 20 million years. The rarity of these small ornithischians in the fossil record of Alberta may have been due to ecological exclusion from the wet, coastal environments that were preferred by the larger, more abundant ceratopsids.

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Müller, Hendrik, et Alexander Kupfer. « On the taxonomy of ichthyophiid caecilians from southern Thailand : A reevaluation of the holotype of Ichthyophis supachaii Taylor 1960 (Amphibia : Gymnophiona : Ichthyophiidae) ». Amphibia-Reptilia 25, n^o 1 (2004) : 87–97. http://dx.doi.org/10.1163/156853804322992869.

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AbstractThe taxonomy of South-East Asian ichthyophiid caecilians is largely in a woeful state. We give a new diagnosis for Ichthyophis supachaii from Thailand, based on a reexamination of the complete type series and recently collected material. The holotype is redescribed. The higher number of splenial than dentary teeth, a previously reported main diagnostic character of the taxon, is rejected. Ichthyophis supachaii follows the usual pattern of ichthyophiid caecilians in having more dentary than splenial teeth. Nevertheless, Ichthyophis supachaii is regarded as a valid taxon based on several morphometric and meristic characters. We provide a detailed description of the male phallodeum.

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Schmalz, Gottfried, Franziska Gröppel, Karl-Anton Hiller et Kerstin M. Galler. « Trodimenzionalne kulture ljudskih stanica uzgojene radi testiranja citotoksičnosti stomatoloških materijala ». Acta Stomatologica Croatica 48, n^o 2 (15 juin 2014) : 99–108. http://dx.doi.org/10.15644/asc48/2.99.

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Chuquiano Bringas, Samantha Ysabel, Khety Karen Arroyo Rivera et Rafael Morales Vadillo. « Estabilidad de color de tres materiales dentales provisorios sumergidos en dos agentes pigmentantes ». Kiru 18, n^o 1 (31 mars 2021) : 11–18. http://dx.doi.org/10.24265/kiru.2021.v18n1.02.

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SOARES, Fábio Gonçalves, Fernando Freitas PORTELLA, Luis Carlos da Fontoura FRASCA, Caren Serra BAVARESCO et Elken Gomes RIVALDO. « Masticatory satisfaction, ability, and performance in partially dentate patients after periodontal therapy ». Revista de Odontologia da UNESP 47, n^o 6 (décembre 2018) : 360–64. http://dx.doi.org/10.1590/1807-2577.13118.

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Abstract Introduction Understanding the effects of periodontal therapy is essential in performance and satisfaction of partially dentate patients. Objective To assess the effect of subgingival periodontal treatment in performance and masticatory satisfaction and ability as reported by partially dentate patients with untreated chronic periodontitis. Materials and method Patients were given nonsurgical periodontal treatment and masticatory satisfaction, ability, and performance were evaluated before and after treatment. Performance was assessed based on sieving chewed standardized chewable material, while satisfaction and ability were analyzed using a questionnaire based on OHIP-EDENT. Result Mean numbers of functional tooth units were 10.36 ± 1.43 anterior and 6.73 ± 0.79 posterior teeth. Masticatory performance did not vary significantly (p = 0.075), and mean particle sizes before and after treatment were 4.23 ± 1.84 mm and 3.90 ± 0.75 mm, respectively. Overall satisfaction and ability scores after treatment were higher (p > 0.05) compared with scores prior to the periodontal intervention. Conclusion Periodontal treatment improves masticatory satisfaction and ability with no effect on performance.

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Smirnov, Alexey V., Maria R. Ekova, Ivan N. Tyurenkov et Elena V. Volotova. « Immunophenotypic characteristics of inducible NO synthase expression in dentate gyrus of mature rats in modeling depression and its pharmacological correction ». Morphology 159, n^o 1 (15 janvier 2021) : 21–28. http://dx.doi.org/10.17816/1026-3543-2021-159-1-21-28.

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AIM: The work aimed to investigate inducible NO synthase (iNOS) expression in dentate gyrus in mature rats when modeling depression, as well as the establish the pharmacological correction possibility of detected changes with Phenibut and compounds under laboratory codes of RSPU-189, RSPU-135. MATERIALS AND METHODS: Depressive-like behavior in animals was modeled by combining stressful stimuli such as loud sound, pulsating bright light, and vibration simultaneous with constant restriction of mobility and fluctuations in temperature of environment for 7 days (daily for 30 minutes). Changes in level of iNOS expression in dentate gyrus were assessed by calculating relative area of immunoreactive material (IRM) and staining intensity in points from 0 to 3. RESULTS: Compared with the control group, rats with experimental depression showed an increase in expression of iNOS-IRM in cytoplasm of neuronal perikarya in granular layer of dentate gyrus, as well as an increase in relative area of iNOS-IRM in neuropil and nerve cells. The use of the compound RSPU-189 (salifen) demonstrated to a greater extent the corrective effect, since in the cytoplasm of neuronal perikarya in granular layer of dentate gyrus of rats, there was a decrease in the expression of iNOS-IRM, as well as a decrease in the relative area of iNOS-IRM in neuropil and nerve cells, which corresponded to values of these parameters in the control group of animals. CONCLUSIONS: An experimental modeling of depression in dentate gyrus of mature rats revealed an increase of iNOS-IRM expression, the decrease of which was noted in its pharmacological correction with the compound RSPU-189 (salifen), which may indicate the predominant neuroprotective effect of this compound on GABAergic neurotransmission mechanisms.

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Maciel, Rayanne dos Santos, et Fernando Nascimento. « Evolução das resinas compostas ». Research, Society and Development 11, n^o 15 (14 novembre 2022) : e191111537182. http://dx.doi.org/10.33448/rsd-v11i15.37182.

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O surgimento das resinas foi um grande marco para a odontologia, anteriormente quando se confecionava restaurações dentais utilizando amalgama dental, na grande maioria dos casos era necessário a realização de grandes desgastes das estruturas dentarias sadias para que se obtivesse um preparo cavitário que atendesse as exigências do amalgama dental. Com o surgimento das resinas compostas esse desgaste excessivo foi extinto uma vez que este material não exigia características especificas de preparo para seu emprego. Com o passar do tempo as resinas compostas passaram por evoluções passando pelo surgimento de resinas microparticuladas, microhibridas e nanohibridas. Foi realizada uma revisão da literatura narrativa acerca do tema proposto utilizando como base bibliográfica artigos científicos publicados entre o ano 2017 e 2022, disponíveis nos bancos de dados online BVSalud, PUBMed e Scielo, todos os trabalhos encontram disponíveis em português, inglês e espanhol. A busca por artigos cientificos foi realizada utilizando as expressoes “Resinas compostas”, “Evolução das resinas compostas”, “Microhibridas”, “Nanoparticuladas”, “composite resins”, “Evolution of composite resins”, “microhybrids” e “nanoparticulates”. Foram excluídos os artigos sem relação com o tema e/ou disponíveis em outros idiomas que não sejam português, inglês ou espanhol. Após analisar todo o material utilizado como base bibliográfica para o desenvolvimento deste trabalho, conclui-se que, as resinas foram um importante marco, viabilizando a realização de tratamentos conservadores e estéticos, no entanto, é de extrema importância que os cirurgiões dentistas saibam realizar a indicação destas em casos que estás são adequadas para uso.

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Buffetaut, Eric. « A new sauropod dinosaur with prosauropod-like teeth from the Middle Jurassic of Madagascar ». Bulletin de la Société Géologique de France 176, n^o 5 (1 septembre 2005) : 467–73. http://dx.doi.org/10.2113/176.5.467.

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Abstract A dentary bone containing several teeth, from the Middle Jurassic (Bathonian) of northwestern Madagascar is described as the type of a new sauropod dinosaur taxon, Archaeodontosaurus descouensi, n.g., n.sp. This taxon is characterised by the unusual combination of a dentary with a deep anterior part, as in advanced sauropods, and teeth with large serrations and a convex lingual side, which resemble the teeth of prosauropods. A more common pattern in early sauropods is the combination of a low, prosauropod-like dentary and spoon-shaped, sauropod-like teeth. Although the condition in Archaeodontosaurus descouensi strongly suggests that basal sauropods had prosauropod-like teeth, what is known of the jaw and dentition in various early and middle Jurassic sauropods indicates mosaic evolution along different paths during the early diversification of the group. Archaeodontosaurus descouensi differs from Jurassic sauropod material from Madagascar, previously described as Bothriospondylus and Lapparentosaurus, which needs revision. It appears that at least two distinct sauropods, with different tooth morphologies, are present in the Middle Jurassic of Madagascar.

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Cosio Dueñas, Herbert, et Fredy Mendoza Canal. « EXPANSOR DE MC NAMARA MODIFICADO Y TRACCIÓN EXTRAORAL ». El Antoniano 131, n^o 1 (22 novembre 2019) : 117–38. http://dx.doi.org/10.51343/anto.v131i1.68.

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El propósito del presente reporte de caso clínico es determinar si los cambios esqueléticos verticales producidos por la ERM (aparato de Mc Namara) son perjudiciales teniendo en cuenta los pacientes dolicofaciales no severo y si existen diferencias con el tratamiento en base a los aparatos de Haas o Hyrax. Material y métodos: Evaluamos las dimensiones esqueléticas verticales en los modelos y clínicamente en pre y post tratamiento ortodóntico del caso clínico con ERM (aparato de Mc Namara) paciente tratado con aparatología fija Hyrax. Resultados: Relación Esquelética: Prognatismo maxilar y mandibular con valores Aumentado 88 grados, aumentado el Tamaño mandibular. CoGn.112 grados. Relación Dentaria: Posición dentaria del Incisivo superior retruido 16 grados, posición dentaria mandibular de Incisivo Inferior Retruido 16 grados, Con ángulo interincisivo abierto de 148 grados, indica incisivos retruidos. Conclusiones: No existen diferencias significativas en los efectos esqueléticos verticales producidos por los aparatos de Haas o Hyrax y los efectos indeseados producidos por la EMR son despreciables, por lo que no existen contraindicaciones para realizar este procedimiento en pacientes dolicofaciales.

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Seghier, Zoubida, Ambroise Diby, Vanda Voytekunas, Philip Cheang et Marc J. M. Abadie. « Effect of filler type, content and size on the UV photocuring dental materials ». Chemistry & ; Chemical Technology 2, n^o 1 (15 mars 2008) : 15–18. http://dx.doi.org/10.23939/chcht02.01.015.

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A BisGMA, TEGDMA monomer mixture at weight ration 2:1 was UV-cured with CQ to form commonly used dental materials. Three types of fillers at different particle size were added at different weight concentrations. Reaction rates k, time vs rate were studied for all the systems.

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Ahmed, Naseer, Maria Shakoor Abbasi, Quratulain Mariam, Hanan William, Hafsa Iftikhar, Hamna Badar et Adil Bin Irfan. « Analysis of Dental Practitioners Perception Towards Dental Implants ». Journal of the Pakistan Dental Association 30, n^o 1 (11 février 2021) : 45–49. http://dx.doi.org/10.25301/jpda.301.45.

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OBJECTIVE: To investigate the dental practitioner's knowledge, attitude and practice towards dental implants. METHODOLOGY: This study was carried out from May'2019 - Oct 2019. 752 dental practitioners who were currently practicing were included in the study. A well-structured questionnaire was used for data collection. SPSS-25 was used for statistical analysis. Spearman correlation was used to find the effect of gender, knowledge and attitude. The P <0.05 was considered statistically significant. RESULTS: In this study 80.9% dental practitioners were aware of the appropriate implant material while, 57.9% had knowledge about the types. 30.3% knew about the implant surface modifications whereas 46.1% dentists were aware of possible implant placement approaches. 49.3% believed that the distance between dental implants to be 3mm and between a dental implant and natural tooth to be 1.5 mm. 76% dentists claimed that dental implants have biomechanical complications. Whereas 67.8% knew about the Branemark's theory of osseointegration. Regarding the attitude of dental practitioners, 28.9% had received implant hands on trainings while 9% felt competent to place an implant. CONCLUSION: This study describes that dental practitioners had an appropriate knowledge of each aspect of implantology. Moreover despite the fact majority felt that they are not competent enough to practice it. Thus, it is important that the curriculum, teaching standards, the materials and methods regarding dental implants need to be reviewed and more exposure of hands-on workshops is to be provided not only for the graduates but also the undergraduates during their clinical learning. KEYWORDS: Dental Implants, Dentist's opinion, Knowledge HOW TO CITE: Ahmed N, Abbasi MS, Mariam Q, William H, Iftikhar H, Badar H, Irfan AB. Analysis of dental practitioners perception towards dental implants. J Pak Dent Assoc 2021;30(1):45-49

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Akhmetova, Saule, Karakoz Zhailovna Badekova, Gayane Atazhanova, Yana Levaya et Marlen Smagulov. « Anti-inflammatory activity of a dental gel based on Origanum vulgare raw material ». Bulletin of the Karaganda University. “Biology, medicine, geography Series” 104, n^o 4 (30 décembre 2021) : 91–96. http://dx.doi.org/10.31489/2021bmg4/91-96.

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Inflammatory and destructive diseases of parodontosis are one of the most complex and common forms of the teeth diseases of human population. Search of the herbal preparation with anti-inflammatory activity is a prospect way for development of new drugs on the base of local raw material. A prerequisite for this study has been the presence of a high antimicrobial and anti-caries activity of the essential oil of medicinal plant Origanum vulgare. The article presents for the first time the results on the anti-inflammatory activity of dental anti-caries gel with essential oil and ethanol extract of oregano. A sample of dental gel at a dose of 25 mg / kg has anti-inflammatory activity, which was expressed in a significant decrease by 41.4 % in the amount of inflammatory lymph in the abdominal teeth in rats compared to controls. The anti-inflammatory activity of this sample is comparable to the reference drug diclofenac sodium.

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Vélez Toala, Roysi, Carlos Valdivia Silva, Amanda Hilda Koctong Choy, Berty Chávez Zanga et Juan Carlos Aycachi Romero. « PREVALENCIA DE CARIES Y NECESIDAD DE TRATAMIENTO EN ESCOLARES DE 12 AÑOS EN LA PROVINCIA DE TACNA 2016 ». Revista Médica Basadrina 12, n^o 1 (9 mai 2019) : 42–45. http://dx.doi.org/10.33326/26176068.2018.1.632.

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INTRODUCCIÓN: La caries dental es una enfermedad de mayor prevalencia a pesar de las diferentes acciones que realiza el Ministerio de Salud, construyendo un gran problema de la salud pública. El objetivo fue determinar la prevalencia de caries dental y la necesidad de tratamiento en escolares de 12 años de edad. MATERIAL Y MÉTODOS: Estudio de campo, tipo descriptivo-transversal, se utilizó el Índice CPOD - 12 y necesidad de tratamiento propuestos por la OMS. La población estudiada fueron todos los escolares de 12 años de edad que estudian en las instituciones educativas de toda la provincia de Tacna, con una muestra estraficada aleatoria de 981 escolares. Según la OMS, CPOD 12, es la edad recomendada para estos estudios ya que es la más afectada por la enfermedad (caries dental). RESULTADOS: Se encontró que la prevalencia de caries mediante el Índice de CPOD para los escolares de 12 años de la provincia de Tacna fue de 3,85, considerado rango moderado según la cuantificación de la OMS. El promedio de piezas dentales según tratamiento requerido para toda la población fue el 46,3% de piezas dentarias que no requieren tratamiento alguno, la pieza dentaria con necesidad de tratamiento de sellantes fue de 41,96 %; obturación en una superficie con un 9,62%; obturación de dos superficies con 1,69%; coronas 0,07%, tratamiento pulpar 0,23% y exodoncias 0,13%. CONCLUSIÓN: Los niños de 12 años de Tacna tienen una prevalencia de caries en un rango moderado. Se ene la necesidad de realizar tratamientos preventivos promocionales para disminuir el Índice de COPD y realizar tratamientos en el nivel primario.

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Black, Bryan A., et Marc D. Abrams. « Analysis of temporal variation and species-site relationships of witness tree data in southeastern Pennsylvania ». Canadian Journal of Forest Research 31, n^o 3 (1 mars 2001) : 419–29. http://dx.doi.org/10.1139/x00-184.

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Witness tree species site relationships are described with respect to parent material, soil drainage, and soil surface texture in Lancaster County, southeastern Pennsylvania. Quercus velutina Lam. and Carya were positively associated with "limestone" parent materials and well-drained, loamy sites. Quercus velutina was strongly associated with "acid shale and sandstone" parent materials and well-drained, upland soils. Quercus alba L. was most abundant on parent material classes associated with stream valleys and coves while Qurecus prinus L. and Castanea dentata (Marsh.) Borkh. were positively associated with well-drained, rocky sites on "quartzite" parent materials. Procedures were then developed to test for significant changes in witness tree species frequencies over the 100-year period of metes and bounds surveys in Lancaster County. These tests revealed that Quercus coccinea L., Nyssa sylvatica Marsh., and early successional species were surveyed much later than Quercus rubra L., Q. alba, and Carya spp. Agricultural land clearing, cutting for firewood, selective logging, and the charcoal-iron industry all probably contributed these species changes. Overall, abundances of minor species appear to be much more sensitive to these early settlement land uses. Given the extent of metes and bounds surveys, these tests for temporal variations may be applied to witness tree data throughout the eastern United States.

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Savencu, Cristina Elena, Liliana Porojan et Cristina Maria Borţun. « Applications of additive technologies in dentistry ». Romanian Journal of Stomatology 62, n^o 3 (30 septembre 2016) : 81–85. http://dx.doi.org/10.37897/rjs.2016.3.6.

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Aim. Untill now CAD/CAM technologies meant exclusively milled dental restorations. With the development of 3D. Printing technologies they are penetrating in the medical field. The purpose of this paper is to illustrate the application of additive technologies in dentistry. Materials and methods. On a maxillary first molar preparation two metal copings were made for fixed metal-ceramic partial restorations using additive technologies: Direct MetalLaser Sintering (DMLS) and Selective Laser Melting (SLM). Digital light processing technology (DLP) was used to produce a surgical guide for insertion of a post-extraction dental implant and also for a long-term temporary restoration. Results. Innovative additive technologies used in dental technology shows numerous advantages over classical technologies slip-casting and milling procedures for alloys and polymerization for resin materials, resulting prosthetic parts with a different internal structure, faster, with less cost, with a huge development potential. Conclusions. The benefits of using CAD/CAM technology includes reduced treatment time, superior accuracy and precise visualization of the final result of the treatment.

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Lardani, Lisa, Giacomo Derchi, Vincenzo Marchio et Elisabetta Carli. « One-Year Clinical Performance of Activa™ Bioactive-Restorative Composite in Primary Molars ». Children 9, n^o 3 (19 mars 2022) : 433. http://dx.doi.org/10.3390/children9030433.

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Restorative procedures for caries affecting primary molars are a daily challenge for pediatric dentistry, and one of the main factors influencing the results of these restorative procedures is the choice of dental material used: bioactive materials were recently introduced, combining the strength of composites and the benefits of glass ionomers. The present study’s objective is to clinically evaluate the aesthetic, functional and biological properties of Activa™ Bioactive composite in approximal and occlusal carious lesions for 1 year using the FDI criteria for evaluating direct dental restorations. Forty-five children with occlusal or approximal caries in first or second primary molars were included in the study: the cavities were then randomized to be restored with either Activa BioActive or SDR Bulk-fill and evaluated over time according to Federation Dentaire Internationale (FDI) criteria. Results showed that Activa BioActive composite has similar performance over time compared to Bulk-fill composite, for both functional and aesthetic properties. Thus, within the limitations of this study, including the short follow-up period, it can be concluded that bioactive materials might be the material of choice to restore primary molars. A longer follow-up period is desirable to confirm these findings.

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Schwartz-Dabney, C. L., et P. C. Dechow. « Variations in cortical material properties throughout the human dentate mandible ». American Journal of Physical Anthropology 120, n^o 3 (3 février 2003) : 252–77. http://dx.doi.org/10.1002/ajpa.10121.

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Cabañas Godoy, Angélica, Ninfa Jacquett Toledo et María Teresa Chirife. « Nivel de conocimiento y conducta de docentes de educación escolar básica de escuelas públicas frente a casos de avulsión y fractura dentaria ». Revista de Odontopediatría Latinoamericana 3, n^o 1 (10 février 2021) : 10. http://dx.doi.org/10.47990/alop.v3i1.54.

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Objetivo: Evaluar el nivel de conocimiento y conducta de los docentes de Educación Inicial, docentes del 1er Ciclo, docentes del 2do Ciclo y docentes de Educación Física de las escuelas públicas de la ciudad de San Lorenzo (Paraguay) frente a casos de Avulsión y Fractura Dentaria durante el año 2009. Material y Método: El diseño fue tipo observacional descriptivo de corte transversal. El muestreo fue probabilístico; teniendo en cuenta los criterios de selección dentro de una muestra de 141 docentes. Se clasificaron los datos según el género, grupo etáreo, grado de capacitación, y años de experiencia profesional; para lo cual se confeccionó un cuestionario. Resultados: El nivel de conocimiento sobre avulsión y fractura dentaria más frecuente de los docentes fue el moderado con un 50 % (70/141), seguido por el conocimiento bajo con un 27% (38/141). La conducta a seguir sobre avulsión y fractura dentaria más frecuente por los docentes fue el regular con un 47 % (66/141), seguido por la conducta a seguir favorable con un 30% (42/141). Conclusión: el nivel de conocimiento sobre avulsión y fractura dentaria más frecuente fue el moderado, en cuanto a los resultados de la conducta a seguir el más frecuente fue el de regular. Teniendo en cuenta los datos anteriormente presentados se torna necesario implementar campañas educativas sobre la atención de emergencias en Traumatismos Dentales en las escuelas, ya que en el ambiente escolar la persona más cercana al niño es el docente y su intervención en el momento que el niño sufre el traumatismo dental puede ser determinante para la resolución de los daños que éste pueda haber sufrido.

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MATEUS, OCTÁVIO, RICARDO ARAÚJO, Carlos Natário et RUI CASTANHINHA. « A new specimen of the theropod dinosaur Baryonyx from the early Cretaceous of Portugal and taxonomic validity of Suchosaurus ». Zootaxa 2827, n^o 1 (21 avril 2011) : 54. http://dx.doi.org/10.11646/zootaxa.2827.1.3.

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Although the Late Jurassic of Portugal has provided abundant dinosaur fossils, material from the Early Cretaceous is scarce. This paper reports new cranial and postcranial material of the theropod dinosaur Baryonyx walkeri found in the Barremian (Papo Seco Formation) of Portugal. This specimen, found at Praia das Aguncheiras, Cabo Espichel, consists of a partial dentary, isolated teeth, pedal ungual, two calcanea, presacral and caudal vertebrae, fragmentary pubis, scapula, and rib fragments. It represents the most complete spinosaurid yet discovered in the Iberian Peninsula and the most complete dinosaur from the Early Cretaceous of Portugal. This specimen is confidently identified as a member of Baryonychinae due to the presence of conical teeth with flutes and denticles in a dentary rosette. The specimen ML1190 shares the following characteristics with Baryonyx walkeri: enamel surface with small (nearly vertical) wrinkles, variable denticle size along the carinae, 6–7 denticles per mm, wrinkles forming a 45 degree angle near the carinae, and tooth root longer than crown. In addition, dubious taxa based on teeth morphology such as Suchosaurus cultridens (Owen, 1840–1845), and Suchosaurus girardi (Sauvage 1897–98; Antunes & Mateus 2003) are discussed, based on comparisons with well-known material such as Baryonyx walkeri Charig & Milner, 1986. Suchosaurus cultridens and S. girardi are considered as nomina dubia due to the lack of diagnostic apomorphies, but both specimens are referred to Baryonychinae incertae sedis.

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Kamaraj, Raju, Annamalai Maduram et Raman N. « HEPATOPROTECTIVE ACTIVITY OF VARIOUS EXTRACTS OF CLAUSENA DENTATA (WILLD.) ROEM. (SYN. CLAUSENA WILLDENOVII WIGHT. AND ARN.) RUTACEAE ». Asian Journal of Pharmaceutical and Clinical Research 10, n^o 10 (1 septembre 2017) : 310. http://dx.doi.org/10.22159/ajpcr.2017.v10i10.20127.

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Objectives: Clausena (Rutaceae) is a genus of about 23 species of unarmed trees and shrubs. The stem bark of Clausena dentata is used in veterinary medicine for the treatment of wounds and sprains. Even though C. dentata has a lot of potential medical uses, the study on pharmacological activities is in scarce. The present study was undertaken hepatoprotective activity of various extracts of C. dentata. Methods: The plant C. dentata was collected from Kadagaman, near Tiruvannamalai, Tamil Nadu, India. The dry powder of stem bark (2.5 kg) was first soaked in hexane for 24 hrs. The extract was suction filtered. This was repeated for two more days, and similar extracts were pooled together and concentrated at 40°C using Buchi R - 153 Rotavapor. The residual plant material was extracted successively with chloroform and methanol same manner. Preliminary phytochemical test and hepatoprotective activity of various extracts of C. dentata against carbon tetrachloride (CCl4) induced hepatotoxicity in rats were carried out. Biochemical and histopathological changes were observed.Results: The highly significant (p<0.01) reduction in the levels of serums glutamic oxaloacetic transaminase, glutamic pyruvic transaminase, alkaline phosphatase, and bilirubin observed in the study in rats simultaneously treated with C. dentata extracts and CCl4 as compared to CCl4 alone treated.Conclusion: CCl4 induced hepatic damage was counteracted by the extracts of C. dentata. Changes were observed in enzymatic and histopathological level, when compared to CCl4 alone treated group.

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Salcedo Rioja, Rita, Rosa Pari Espinoza et Rubén Rivera Salazar. « Agregado de trióxido mineral en la preservación de segundo molar primario en agenesia de sucedáneo ». Odontología Sanmarquina 12, n^o 2 (14 mai 2014) : 74. http://dx.doi.org/10.15381/os.v12i2.2870.

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Se reporta un caso clínico de paciente femenina de 10 años de edad, a la que se le realiza una pulpectomía del diente 75 con agregado de trióxido mineral (MTA) como material de obturación definitiva, con el fin de preservar la pieza dentaria el mayor tiempo posible debido a la agenesia del sucedáneo. Se demostró la eficacia tanto clínica como radiográfica del empleo del agregado trióxido mineral (MTA).

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Chang, Huali, Hai-Lu You, Li Xu, Waisum Ma, Diansong Gao, Songhai Jia, Mengli Xia et al. « Relatively low tooth replacement rate in a sauropod dinosaur from the Early Cretaceous Ruyang Basin of central China ». PeerJ 9 (27 octobre 2021) : e12361. http://dx.doi.org/10.7717/peerj.12361.

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Tooth replacement rate is an important feature related to feeding mechanics and food choices for dinosaurs. However, only a few data points are available for sauropod dinosaurs, partially due to rarity of relevant fossil material. Four somphospondylan sauropod species have been recovered from the Lower Cretaceous Aptian–Albian Haoling Formation in the Ruyang Basin, Henan Province of central China, but no cranial material has been reported except for a single crown. Here we report the discovery of the rostral portion of a left dentary with replacement teeth in its first five alveoli. Comparative anatomical study shows the partial dentary can be assigned to a member of early diverging somphospondylans. The non-destructive tooth length-based approach to estimating tooth formation time and replacement rate is adopted here. The estimated tooth replacement rate is 76 days, faster than that of Brachiosaurus (83 days) and much lower than typical late diverging lithostrotian titanosaurians (20 days). Thus, this discovery adds an intermediate tooth replacement rate in the evolution of titanosauriform sauropods and supports the idea that evolution of tooth replacement rate is clade-specific. This discovery also provides more information to understand the Ruyang sauropod assemblage, which includes one of the most giant dinosaurs to have walked our Earth (Ruyangosaurus giganteus).

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DE OLIVEIRA, TÉO VEIGA, CESAR LEANDRO SCHULTZ, MARINA BENTO SOARES et CARLOS NUNES RODRIGUES. « A new carnivorous cynodont (Synapsida, Therapsida) from the Brazilian Mid-dle Triassic (Santa Maria Formation) : Candelariodon barberenai gen. et sp. nov. » Zootaxa 3027, n^o 1 (15 septembre 2011) : 19. http://dx.doi.org/10.11646/zootaxa.3027.1.3.

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A new small cynodont, Candelariodon barberenai gen. et sp. nov., from the Middle Triassic of Brazil (Santa Maria Formation) is reported. The new taxon is represented by a partial mandible having some complete teeth. The morphology of the dentary and splenial is similar to other carnivorous cynodonts, except for the absence of the angular process of the dentary. The anterior-most lower teeth are slightly expanded buccolingually with a tall and posteriorly curved main cusp and one or two accessory cusps. The posterior-most preserved lower postcanine, however, has lingual and buccal rows of cusps, each formed by four anteroposteriorly aligned cusps, separated by a shallow basin. This tooth resembles the posterior-most lower teeth of Aleodon Crompton 1955 from the Middle Triassic of Tanzania, but the anterior-most teeth of Candelariodon and Aleodon are essentially different. In this context, the phylogenetic relationships of the new taxon remain unclear until the discovery of more informative material.

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Mayil, Meltem, Gaye Keser, Arzu Demir et Filiz Namdar Pekiner. « Assessment of Masseter Muscle Appearance and Thickness in Edentulous and Dentate Patients by Ultrasonography ». Open Dentistry Journal 12, n^o 1 (28 septembre 2018) : 723–34. http://dx.doi.org/10.2174/1745017901814010723.

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Objectives: The purpose of the present study was to examine ultrasonographic appearances of Masseter Muscle (MM) in dentate and edentulous patients without Temporomandibular Disorder (TMD). Materials and Methods: The thickness of the MM in 25 dentate (mean age: 30,68 ± 10,49) and 24 edentulous (mean age: 61,46 ± 9,71) patients, who visited routine dental examination, was measured at rest and at maximum contraction bilaterally. Examinations were performed using an Aloka Prosound α6 (Hitachi Aloka Medical Systems, Tokyo, Japan) equipped with an 8 MHz-wide bandwidth linear active matrix transducer (ranging from 1 to 15 MHz). The visibility and width of the internal echogenic bands of the MM were also assessed and the muscle appearance was classified as I of III types. Type I, characterized by the clear visibility of the fine bands; Type II, thickening echogenicity of the bands; Type III, disappearance or reduction in a number of the bands. Results: MM thickness at rest and contraction in the dentate group were significantly higher than the edentulous group (p <0.05). Type I was the most common echogenic type in both dentate (right:16 (64%), left; 15 (60%)) and edentulous patients (right; 22 (91.7%), left; 18 (75%)). In a dentate group, type II was significantly higher than the edentulous group in both the right and left sides (p <0.05; p <0.01, respectively). Age and gender seemed to have no significant effect on the echogenic type (p ˃0.05). Conclusion: There were significant differences in the thickness at rest and contraction between the dentate and edentulous groups. It was clarified that ultrasonographic features of the MM in dentate and edentulous patients were different.

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