Teeth discoloration and prescribed slimming magistral formula : a case report

Poster presented at the 4th International Congress of CiiEM - "Health, Well-being and Ageing in the XXI Century." 2-5 June 2019, Campus Egas Moniz, Monte de Caparica, PortugalN/

Dentists and undergraduate dental students require more information relating to child abuse

This is an open access article distributed under the terms of the creative commons attribution Non-Commercial License (http://creativecommons.org/licenses/by-nc/3.0/) which permits unrestricted non-commercial use, distribution,and reproduction in any medium, provided the original work is properly cited.OBJECTIVE: To evaluate the preparation for, and the appropriate approach of dentists to the diagnosis of patient mistreatment. METHOD: This investigation was conducted among sixty randomly selected dentistry students: twenty 1st year students, ten 5th year students at our institution, ten 5th year students at the Faculty of Dentistry, Lisbon University, sixteen dentists at the University Clinic of our institution, and four dentists with private offices. Students and dentists took part voluntarily. The exclusion criteria were (a) prior attendance of another degree, (b) cooperation with social organizations; and, for professionals, less than five years of experience. Data analysis was performed through descriptive and inferential statistics (chi-squared test) for a confidence level of 95%. RESULTS: Among dentists, 38% do not know which area of the organism is the most affected, 43% know it is proper to officially report the fact; out of these, 48% know that the information may be provided anonymously. There are 47% who state that they received no undergraduate training in this area. However, 60% of the students in the last year declare they did receive training. CONCLUSIONS: Dentists are not sufficiently familiar with the subject of child abuse. A regular approach to this matter in undergraduate education is important. It will be very useful to create a working tool unifying the criteria for screening, diagnosing, and registering such events

Influence of intensive training on salivary flow, on salivary pH and on salivary lactate concentration: consequences for oral health

Abstract of the poster presented at the First international Congress of CiiEM “From Basic Sciences to Clinical Research”, 27-28 November 2015, Egas Moniz, Caparica, Portugal

Materiales para la ortodoncia

Capítulo de livr

Evaluación In Vitro del comportamiento electroquímico del Titânio Puro y la aleación Ti-6AI-4V en contacto con aleaciones dentales nobles y no nobles

[spa] Este trabajo evalúa el comportamiento electroquímico entre el Titanio CP (t), Ia aleación de Titanio Ti-6AI-4V (LT) y siete aleaciones dentales: dos aleaciones de Cromo-Cobalto de las marcas comerciales Remanium® 2000+ (R) y Wironite®extrahart, 4 aleaciones nobles de las marcas Cerapall®2 (C), Pontor2 (P), V-Gnathos® Plus (VG) y Pagalin 2 (PA) y una aleación para amalgama de Ia marca Dispersalloy (A). Las técnicas experimentales utilizadas incluyeron monitorización del potencial de circuito abierto y medidas de variación de Ia corriente galvánica por periodos de 24 horas, para los pares constituidos con cada una de las siete aleaciones presentadas por T y LT. Los estudios se realizaron in vitro, utilizando como electrólito una composición de saliva artificial diferente a las habitualmente utilizadas (279,280), estudiada y presentada por sus autores como Ia más adecuada para el estudio in vitro del comportamiento corrosivo de aleaciones destinadas a Ia confección de dispositivos de rehabilitación intraoral. Ademas de Ia diferencia en Ia composición, Ia saliva artificial fue usada siempre en situación de desaireación, con ello se pretendía simular situaciones cuya frecuencia en Ia cavidad oral no es irrelevante (35, 63, 135,281) Las muestras fueron analizadas mediante a SEM y su composición evaluada por EDS. Tras los tests efectuados, y en relación a Ia determinación de los valores de potencial de circuito abierto, nos es permitido afirmar que, en regia general, los diferentes metales pueden ser agrupados en función de las semejanzas de comportamiento. La aleación para amalgama, Dispersalloy® y Wironite ®extrahart presentan valor de potencial más negativo, manteniéndose así a lo largo de las 24 horas. De los restantes materiales, hemos agrupado el Titanio Puro con las aleaciones de Pagalin y Pontor, con valores de potencial de electrodo al finalizar las próximas 24 horas entre - 0,281 y - 0,287, a continuación con Ia aleación de Cromo Cobalto Remanium®Pius (-0,177) y, por último, con Ia aleación Cerapal®2, V-Gnathos®Pius y Ti-6AI-4V (con valores entre- 0,058 y +0, 015). Posteriormente a Ia evaluación de Ia corriente galvánica entre pares, verifica igualmente que hay un patrón de semejanza traducido por Ia variación de comportamiento de las diferentes aleaciones conforme el par sea T o LT, apareciendo más reactivas en presencia de LT, con excepcion de Ia aleación V-Gnathus, cuyos valores de corriente galvánica durante las 24 horas son más altos en el par con T La aleación para amalgama presenta valores de corriente galvánica que Ia contraindican en situaciones de proximidad con estructuras implantarias o supra implantarias de T o LT, valores los cuales son, también aquí, más elevados en presencia de LT. Sobre las aleaciones nobles Pontor2, Pagalin2 y Gnathus®Pius, concluimos que pueden ser recomendadas para estructuras supra implantarias, los dos primeras para lmplantes de Titanio y Ia última también para implantes de Ti- 6 AI-4V De todas las aleaciones no nobles testadas, Ia que presenta mejor comportamiento corrosivo es Remanium ®2000 + No se encontraron diferencias significativas entre nuestros resultados y los de otros autores que utilizaron saliva desaireada.[eng] Our work evaluated the electrochemical behaviour between Titanium CP (T), Titanium alloy Ti6A14V (LT) and 7 dental alloys: 2 chrome cobalt- Remanium 2000 (R) and Remanium GM 380 (RG); 4 noble alloys - Cerapall (C), Pontor (P), V-Gnathos Plus (VG) and Pagalin 2 (PA); and an amalgam alloy - Dispersalloy (A). The experimental techniques included open circuit potential monitoring and measurements of the galvanic current changes for 24 hour periods of the pairs of each of the 7 alloys and Tor LT. The experiments were conducted in vitro using as electrolyte modified artificial saliva, different from the standard that is thought to be the most adequate for the in vitro study of the corrosion of alloys used in intraoral rehabilitation devices... Artificial saliva was always used non aerated, trying to simulate in vivo frequent conditions... The samples were observed with SEM and its composition by EDS. After the tests, relating to the open circuit potential, we can state that the different metals can be grouped by similar behaviour. The amalgam alloy, Dispersalloy® and Wironite®extrahart presents the most negative potential value during the 24 hours. Pagalin can be grouped with Pontor, with similar electrode potential values after 24 hours (-0.281 to -0.287), the chrome cobalt Remanium®2000+ with -0.1777 and, finally Cerapall, V-Gnathos and Titanium alloy with values ranging from - 0.058 to 0.15. Concerning the galvanic current evaluations between pairs, there is also a similar pattern in the variation of behaviour of the different alloys when the pair is T or LT, being more reactive with the LT, except for V-Gnathus®Pius, in which case, the galvanic current values, during the 24 hours, are higher with T. The amalgam alloy presents galvanic current values that do not make it suitable to be used with Tor LT structures, being worst with LT. In what concerns the noble alloys Pontor2, Pagalin2 and V-Gnathos®Pius, we conclude that Pontor 2 and Pagalin2 can be used in Titania type structures and V-Gnathus®Pius is more suitable on Ti-6AI-4V structures Of all not noble tested alloys, the ones that show better corrosive behaviour are the chrome cobalt- Remanium® 2000 + Our results are comparable to others in which artificial saliva was aerated. After the galvanic current tests between pairs, the SEM analysis showed localized or generalized alterations on the surface of the sample, fact that never occurred with T or LT

Galvanic Corrosion Behaviour of Ti and Ti6Al4V Coupled to Noble Dental Alloys

This study aims to evaluate the electrochemical corrosion behaviour of titanium and Ti6Al4V alloy coupled to the following noble dental alloys: Pontor® 2, Cerapall® 2, V-Gnathos® Plus and Pagalin® 2. The study was conducted in artificial saliva, pH 7.1, at 37 , by linear sweep voltammetry, electrochemical impedance spectroscopy and chronoamperometry.The Rp values of the noble dental alloys varied from 104 to 105 Ω cm2. Data from Eocp curves, linear polarization resistance, Tafel plots and electrochemical impedance spectroscopy lead to the same order for the resistance against corrosion of the four noble alloys in artificial saliva. The order from the less to the more reactive alloy is: Cerapall® 2 → Pontor® 2 → V-Gnathos® Plus → Pagalin® 2. Values of the icouple, varying between 0.2 and 0.7 μA cm-2, were obtained for the four noble alloys when coupled to pure titanium or to the titanium alloy, respectively. Among the couples studied the Pontor® 2 | Ti was found to be the more resistant galvanic couple, while the Cerapall® 2 | Ti6Al4V presents the lowest corrosion resistance

Malocclusion relationship-dental aesthetics Index in need of orthodontic treatment in Angolan population

Orthodontics is based on the concept of ideal occlusion, so it is essential to have a notion, as complete as possible, of normal or ideal occlusion so that it is possible to correctly di agnose malocclusions. In normal occlusion defined by Angle, there is a molar relationship so that the mesiobuccal cusp of the maxillary first molar occludes in the buccal groove of the mandibular first molar and, in which the teeth are positioned in a slightly curved line of occlusion. This line of occlusion is divided into upper and lower [1]. By definition, any variation from normal occlusion is called malocclusion, and is therefore a state where there is a devia tion from ideal occlusion [2-5]. However, malocclusion is not easily measured by patients, as the perception of the various types and severities of malocclusions is highly subjective and perceived in a qualitative rather than quantitative way. Thus, the use of a valid instrument to objectively assess the criteria and recommend and prioritize orthodontic treatment to the patient, such as occlusal indices, becomes essential [6, 7].Several indices have been validated and accepted as useful tools to objectively measure malocclusions and orthodontic treatment needs [8-13]. Among the various indices, the in dex applied in this investigation is the Dental Aesthetics Index (DAI), an occlusal index that allows malocclusion to be grouped into groups according to the level and priority of orthodontic treatment required. It relates the clinical and aesthetic com ponents mathematically, arriving at a score that reflects the severity of the malocclusion [14, 15]. Several studies suggest that the DAI can be universally ap plied, without the need for modifications or adaptations, to different ethnic or cultural scenarios [16, 17]. This investiga tion intends to assess whether the Angolan population has occlusion conditions that are percentage equivalent to other countries. Considering the previous hypothesis, this study aimed to determine the prevalence of malocclusion and the need for orthodontic treatment in young Angolans of black race through DAI

Ciência, Crise e Mudança. 3.º Encontro Nacional de História das Ciências e da Tecnologia. ENHCT2012

III Encontro Nacional de História das Ciências e da Tecnologia. O Centro de Estudos de História e Filosofia da Ciência, organiza o 3.º Encontro Nacional de História da Ciência e da Técnica, sob o tema «Ciência, Crise e Mudança» que tem lugar na Universidade de Évora, nos dias 26, 27 e 28 de Setembro de 2012. O Primeiro Encontro Nacional de História da Ciência teve lugar em 21 e 22 Julho de 2009, no seguimento do programa de estímulo ao de¬senvolvimento da História da Ciência em Portugal e de valorização do património cultural e científico do País, lançado pelo Ministério da Ciência, Tecnologia e Ensino Superior (MCTES) em 31 de Janeiro desse ano. A sua organização coube a investigadores do Instituto de História Contemporânea (IHC), da FCSH da UNL, e do Centro Científico e Cultural de Macau (CCCM), em cujas instalações se realizou. De en¬tre as conclusões do Encontro, destacou-se a de realizar periodicamen¬te novos Encontros Nacionais, a serem organizados de forma rotativa por diferentes centros e núcleos de investigadores. Na sequência deste Primeiro Encontro, o Centro Interuniversitário de História das Ciências e da Tecnologia (CIUHCT) organizou, entre 26 e 28 de Julho de 2010, o II Encontro, dedicado ao tema “Comunicação das Ciências e da Tecnologia em Portugal: Agentes, Meios e Audiências”. Cabe agora ao CEHFCi cumprir o que foi decidido no final deste Encontro. Na situação económica e política que hoje vivemos torna-se particularmente urgente aprofundar o estudo e o debate sobre a interação entre a Sociedade, a Ciência e a sua História. Coordenação Científica e Executiva do encontro estiveram a cargo de dois investigadores CEHFCi: Maria de Fátima Nunes, José Pedro Sousa Dia

Characterisation of microbial attack on archaeological bone

As part of an EU funded project to investigate the factors influencing bone preservation in the archaeological record, more than 250 bones from 41 archaeological sites in five countries spanning four climatic regions were studied for diagenetic alteration. Sites were selected to cover a range of environmental conditions and archaeological contexts. Microscopic and physical (mercury intrusion porosimetry) analyses of these bones revealed that the majority (68%) had suffered microbial attack. Furthermore, significant differences were found between animal and human bone in both the state of preservation and the type of microbial attack present. These differences in preservation might result from differences in early taphonomy of the bones. © 2003 Elsevier Science Ltd. All rights reserved