bluuebunny/crossref_metadata_2025 huggingface dataset:
Concept et théologie
Authors: Godet Alain
Published: February 2015

La question du concept est centrale en théologie car elle touche à la manière dont nous devons parler de Dieu et permet d’indiquer les contours d’une rationalité théologique spécifique. La position originale de Karl Rahner exprime de manière paradigmatique l’importance du concept dans la réflexion théologique en même temps que son inadéquation foncière au regard du mystère qu’il tente de comprendre.
La foi et la raison : leur relation
Authors: Piret Pierre
Published: February 2015

Inscrite dans l’Année de la foi, cette méditation laisse tout d’abord apparaître la question à traiter : que disons-nous de la foi, de la raison, de leur relation éventuelle ? L’A. décrit alors la démarche de la raison allant jusqu’à l’affirmation de Dieu, puis la démarche de la foi partant de l’affirmation que Dieu fait de lui-même. Ce double mouvement de rencontre et d’échange — de l’homme à Dieu et de Dieu à l’homme — trouve son principe et fondement dans le mystère du Christ que confessent les Conciles d’Éphèse et de Chalcédoine.
L'acte de foi chez Newman. Quelques étapes de sa théorie de l'assentiment
Authors: Thomasset Alain
Published: February 2015

Réfléchir sur l’acte de foi a été une préoccupation constante de J.H. Newman. Cet article s’attache à dégager quelques étapes de cette réflexion, partant des Conférences sur la doctrine de la justification (1838) pour aboutir à la Grammaire de l’assentiment (1870). Certains thèmes sont soulignés : la relation de la foi avec les sacrements et avec la raison, la critique de Locke et la place de l’Église.
Mourir vivant. Spiritualité de l'accompagnement en soins palliatifs
Authors: de Maistre Philippe
Published: February 2015

La banalisation de l’euthanasie en Europe fait disparaître la part de l’esprit dans la mort. À l’inverse, l’accompagnement en soins palliatifs met en exergue le langage de la vie exprimée dans le corps de la personne qui meurt. Cette méditation sur la relation entre les soignants et les malades présente une spiritualité chrétienne de l’accompagnement en soins palliatifs. Elle conduit aussi à prendre en compte la dimension spirituelle de l’humanité dans le débat actuel sur la fin de vie.
Grandeur de l'homme précaire
Authors: Maldamé Jean-Michel
Published: February 2015

Pour manifester la grandeur de l’être humain, l’auteur n’est pas parti d’une affirmation puisée dans la révélation ou dans la métaphysique ; il s’est mis à l’écoute des travaux conduits actuellement dans les sciences de la nature. Il en a relevé les exigences de méthode et les philosophies impliquées. Il a ainsi tracé une route qui permet de privilégier l’unité de l’être humain et la transcendance impliquée dans l’acte de vivre. Il a pu de la sorte dégager une nouvelle vision de l’humain où la précarité inscrite dans le chemin de l’émergence hors du monde animal est comprise comme ouverture vers la réflexion, la responsabilité et le souci d’autrui.
La parole prophétique : du rejet à la canonisation
Authors: Janthial Dominique
Published: February 2015

La révélation prophétique commence par la réduction au silence du prophète et la mise hors-jeu de toute parole humaine. Seul le cœur des disciples peut être alors saisi et assumer la transmission qui aboutira par-delà les siècles à la constitution d’ouvrages dont le but est encore de produire des disciples.
Une pédagogie du consentement au corps
Authors: Collaud Thierry
Published: February 2015

Médecin et professeur de théologie morale, l’A. analyse les discours justificatifs des personnes désirant avoir recours au suicide assisté. Il montre que ceux-ci sont construits en grande partie sur la mise en avant du caractère insupportable de la corporéité bio-psychique modifiée par la maladie. Face à ces suicidants qui rejettent leur corps jusqu’à le détruire, la réflexion théologique peut faire appel à d’autres clés de lecture pour éviter ce dualisme. En particulier, la tradition franciscaine valorise une amitié pour le corps extrêmement féconde. À partir de ces réflexions, l’A. développe une pédagogie du consentement au corps blessé et de la capacité de vivre avec lui des moments de grâce. Les pistes ouvertes comprennent la rééducation des sens à la beauté, le réinvestissement du corps comme lieu de vie et de tendresse ou l’hospitalité qui permet d’avancer en commun sur le chemin de l’existence.
Comment préparer la nouvelle évangélisation ?
Authors: Vingt-Trois André
Published: February 2015

La nouvelle évangélisation confronte les chrétiens à assumer la rupture culturelle propre au contexte de notre époque. Tout en désignant les tentations possibles qui s’opposent au dynamisme missionnaire, l’article explore les options théologiques exigées par la mission dans l’Europe post-moderne.
La grâce christique de la Mère de Dieu
Authors: Briede Lelde
Published: February 2015

À l’Annonciation, Marie reçoit un nouveau nom : « Comblée-de-grâce ». Quelle est cette grâce ? Que devient alors sa liberté ? L’exégèse des paroles de l’ange et de la réponse de Marie (Lc 1,28 et 38) et leur lecture dans la tradition (chez S. Thomas, notamment) font saisir comment se conjuguent grâce, liberté et joie en celle qui est le modèle de l’Église.
Expérience et connaissance de Dieu. Henri Le Saux à la rencontre de l'hindouisme
Authors: Carré Nicolle
Published: February 2015

Peut-on conjoindre l’expérience de l’ advaita , comme disciple d’un maître en Inde, et celle de Jésus-Christ comme Dieu fait homme ? L’œuvre d’Henri Le Saux permet de creuser la conviction que Dieu ne saurait se contredire dans la Révélation qu’il fait de lui-même par des chemins divers ; ceux-ci peuvent donc se féconder en nous interpellant sur notre propre voie. Ce qui nous unit est plus important que ce qui nous sépare.
Les mouvements et associations de fidèles dans l'ecclésiologie de Joseph Ratzinger
Authors: Waymel Dominique
Published: February 2015

L’éclosion des nouveaux mouvements de laïcs dans l’Église après le Concile Vatican II a suscité de l’engouement mais aussi des questions et des réserves. Dans ce débat, la contribution théologique de J. Ratzinger mérite d’être relevée. Cet article présente certains principes structurants de la pensée ecclésiologique de J. Ratzinger permettant de saisir comment le théologien les situe au sein du mystère de l’Église, leur crédibilité et leurs limites pour la mission de l’Église.
Gn 4,17 (la première ville) et ses commentaires
Authors: Luciani Didier
Published: February 2015

Le verset biblique racontant la fondation de la première ville est elliptique (Gn 4,17). L’histoire de son interprétation et de sa réception, ancienne et récente, permet-elle d’en déchiffrer le sens et fournit-elle des éléments pour penser, au plan anthropologique et théologique, la réalité urbaine ?
La théologie de Léon le Grand sur la sacramentalité de l'épiscopat
Authors: Pidolle Laurent
Published: February 2015

Léon le Grand, évêque de Rome, cité dans l’enseignement de Vatican  ii sur la sacramentalité de l’épiscopat, entend son ministère comme le « sacrement du divin sacerdoce » du Christ. Cette étude développe l’union des dimensions sacramentelle et ministérielle des chefs d’Églises dans la figure de l’unique Prêtre, le Fils fait homme dans la forma servi et présent constamment à l’assemblée ecclésiale, autant auprès des fidèles laïcs que des fidèles pasteurs. La théologie de Léon intime la différence de nature et de modalité entre sacerdoce commun et hiérarchique, le second signifiant la tête devenue esclave au service du premier.
De la création divine à la création humaine : approches théomorphiques de l'art
Authors: Roux Alexandra
Published: February 2015

Partie de l’homme et de sa poièsis pour en nier les limites et se représenter un produire supérieur, la création digne du Dieu créateur du ciel et de la terre, la philosophie occidentale a fini par l’appliquer à l’homme-artiste : partie d’une conception trop anthropomorphique de la production divine, elle a fini par promouvoir une conception théomorphique de la création humaine. On érige en méthode un tel théomorphisme afin de voir d’abord comment les diverses conceptions de la création divine éclairent effectivement la création humaine. On explore ensuite la relation de l’œuvre au principe créateur : qu’est et que devient l’œuvre une fois qu’elle est créée ? Et que peut nous apprendre sur la création même le destin du créé ?
Deleuze politique ?
Authors: Pachilla Pablo
Published: February 2015

Existe-t-il une « politique deleuzienne » ? Comment se saisir aujourd’hui du legs philosophique, aussi stimulant que problématique, que nous laisse Gilles Deleuze ? La boîte à outils que constitue l’ensemble de ses développements prend des voies différentes en fonction de l’appareil avec lequel il se conjugue. On propose ainsi une présentation critique des principales lignes interprétatives de l’œuvre de Deleuze sur la question politique.
Understanding Inequities in Home Health Care Outcomes: Staff Views on Agency and System Factors
Authors: Davitt Joan K. , Bourjolly Joretha , Frasso Rosemary
Published: February 2015

Results regarding staff perspectives on contributing factors to racial/ethnic disparities in home health care outcomes are discussed. Focus group interviews were conducted with home health care staff (
N
= 23) who represented various agencies from three Northeastern states. Participants identified agency and system factors that contribute to disparities, including: (a) administrative staff bias/discretion, (b) communication challenges, (c) patient/staff cultural discordance, (d) cost control, and (e) poor access to community resources. Participants reported that bias can influence staff at all levels and is expressed via poor coverage of predominantly minority service areas, resulting in reduced intensity and continuity of service for minority patients.

[Res Gerontol Nurs. 2015; 8(3):119–129.]
Sociocultural and Familial Influences on the Well-Being of Mexican Older Adults’ Family Caregivers
Authors: Domínguez-Guedea Miriam Teresa , Garcia Abraham Ocejo
Published: February 2015

The current study analyzed the influence of burden on the well-being of caregivers by exploring the mediating role of sociocultural and family factors. The study sample comprised 386 Mexican caregivers between ages 19 and 87 (mean age = 49.05;SD=12.41 years). The results from the current research showed that burden scores are negatively associated with well-being, sociocultural, and family scores. However, the effect of burden on subjective well-being is minimized by the mediation effect of sociocultural and family resources between burden and well-being. The complexities of sociocultural and family influences should be taken into account to change the prevailing individualistic approach within the current stress and family caregiver well-being paradigm.

[Res Gerontol Nurs. 2015; 8(4):188–196.]
Al llegar: primeros pasos de La Peregrina en España
Authors: Campuzano Luisa
Published: February 2015

Este artículo se propone analizar, desde la perspectiva de los estudios sobre las diásporas, la literatura de viajes, las llamadas “escrituras del yo”, y los estudios de género, las Memorias y la Autobiografía de Gertrudis Gómez de Avellaneda, textos privados, no destinados a la prensa, publicados a comienzos del siglo XX. En ambos, con diferentes intenciones y procedimientos, la criolla joven e ilustrada describe y califica crudamente a la Galicia pre-moderna en la que se ve obligada a vivir entre 1836 y 1838; y compara sus ciudades, costumbres, prejuicios y, en particular, la situación, régimen de vida y trabajo de sus mujeres, con los que ha conocido y practicado en Cuba. Su estatuto de expatriada y su enfrentamiento con un espacio de acogida hostil aguzarán determinados rasgos de su personalidad y determinarán la elección de su pseudónimo: La Peregrina.
De pasiones imaginarias: la narrativa de Gertrudis Gómez de Avellaneda
Authors: Fernández Teodosio
Published: February 2015

El carácter confesional y la condición femenina y feminista de la obra de Gertrudis Gómez de Avellaneda han reclamado insistentemente el interés de la crítica. En contraste, este artículo presta atención a las novelas y leyendas de la escritora hispano-cubana en los aspectos que revelan una inspiración en buena medida libresca y ponen de manifiesto la consciencia y los notables recursos de la autora al transformar motivos y temas de origen muy variado en ficciones propias, conjugando experiencias personales, lecturas y observación de su entorno en un proceso creativo que siempre dejó constancia de su pertenencia al ámbito autónomo de la imaginación literaria.
Gertrudis Gómez de Avellaneda desde otro ápice: su labor como prologuista
Authors: Romero Cira
Published: February 2015

La obra literaria de Gertrudis Gómez de Avellaneda se cumplió fundamentalmente en tres géneros: poesía, narrativa y teatro. Quedan a su favor otros flancos importantes y poco estudiados de su labor, tales como su apreciable quehacer como articulista en trabajos devenidos, a veces, en verdaderos ensayos, y como crítica literaria. En esta última coloco su breve, pero no menos relevante servicio como prologuista, ejercido siempre sobre obras de autores cubanos de mayor o menor relevancia: la condesa de Merlín, Luisa Pérez de Zambrana, Teodoro Guerrero y Ángel Mestre. Nuestra propuesta valora los presupuestos de diverso carácter expuestos en esos trabajos, escritos en diferentes momentos entre 1844 y 1865, donde quedan reveladas sus propias inquietudes literarias, cívicas y también la marca de género, tan presente en el conjunto de su obra.
Análisis de la revista decimonónica La Violeta
Authors: Díaz de Alda Heikkilä M.ª Carmen
Published: February 2015

Este trabajo aborda el análisis de la revista La Violeta (1862-1864), una de las más interesantes publicaciones de la época isabelina, destacándose sus aspectos formales y de interés periodístico Se destaca asimismo la nómina de colaboradores, y se analiza su contenido, evolución, y el papel representado por la revista y su directora Faustina Sáez de Melgar en la educación de las mujeres.
Estudio paramétrico de la respuesta termo-estructural de un puente metálico multijácena sometido a incendios reales
Authors: Peris-Sayol G. , Alós-Moya J. , Payá-Zaforteza I. , Hospitaler-Pérez A.
Published: February 2015

La respuesta de los puentes frente al fuego es un tema poco estudiado y ausente de las normativas actuales a pesar de la frecuencia y consecuencias de los incendios en puentes. Por ello, este artículo analiza la respuesta de un puente metálico multijácena ante incendios reales provocados por un camión cisterna. Para ello se realizan primeramente modelos de incendio del puente y su entorno con técnicas de Dinámica de Fluidos Computacional y luego análisis termo-estructurales no lineales de las vigas más afectadas por el fuego. El estudio analiza aspectos de modelización numérica y la influencia de la posición del camión y la existencia de derrames de combustible. Los resultados son de interés para ingenieros e investigadores y muestran (a) la importancia de considerar condiciones reales de incendio y no modelos simplificados y (b) la necesidad de desarrollar herramientas específicas para el proyecto de puentes frente al fuego.
Detección de daño estructural de losas de hormigón armado de puentes sometidas a fatiga
Authors: Zanuy C. , Maya-Duque L. F. , Gallego J. M. , De la Fuente P.
Published: February 2015

La naturaleza compleja de muchos fenómenos estructurales requiere que los modelos numéricos necesiten ser verificados con el comportamiento estructural real. Por ello, muchas estructuras son monitorizadas, tanto para detectar posibles daños estructurales como para proporcionar datos a incluir en los modelos. A menudo, la monitorización se basa en el cambio de las propiedades dinámicas mediante técnicas de análisis modal experimental. Con respecto al hormigón estructural, la mayoría de los trabajos existentes se ha centrado en el cambio de las frecuencias propias con cargas monótonamente crecientes. En este artículo se analizan los efectos de la fatiga. Se ha llevado a cabo una campaña experimental sobre piezas que reproducen la losa superior de tableros de puentes, realizándose ensayos de fatiga y uno estático de referencia. Las propiedades dinámicas se han ido extrayendo mediante técnicas de output-only a partir de ensayos de excitación mediante impacto. El cambio de las propiedades dinámicas se ha correlacionado con las etapas del proceso de fatiga: formación de fisuras, reducción de tension-stiffening y rotura frágil de la armadura.
Un método sencillo de diseño de estructuras tensadas combinando mallado en topología y análisis no lineal de estructuras
Authors: Jurado-Piña R. , Salazar-Troya M. A.
Published: February 2015

Al diseñar una estructura tensada la forma inicial es normalmente desconocida. Los métodos de búsqueda de forma permiten al ingeniero obtener una geometría inicial dadas unas condiciones de contorno. Existen diferentes métodos de búsqueda de formas de equilibrio, pero todos tienen limitaciones y no existe uno único óptimo para cualquier tipo de problema. El ingeniero debe elegir la combinación de métodos que mejor se adapte a sus necesidades. En este artículo se propone un método combinado para generar configuraciones de equilibrio satisfactorias en estructuras tensadas. Como motor de búsqueda para el diseño preliminar se emplea el método de las densidades de fuerza (FDM) implementado con mallado en topología (TM), y se propone un procedimiento basado en análisis no lineal de estructuras para el refinamiento de la configuración inicial de equilibrio, permitiéndose así el empleo de las mismas herramientas tanto para el refinamiento de la solución inicial como para el cálculo posterior bajo condiciones de carga.
Estudio experimental y numérico de uniones con angulares ejecutadas con perfiles europeos
Authors: Reinosa J. M. , Loureiro A. , Gutiérrez R. , López M.
Published: February 2015

En este artículo se presenta el ensayo experimental y el modelo numérico de cuatro uniones de estructura metálica realizadas con casquillos angulares de diferentes espesores. El problema se ha resuelto mediante el programa comercial de elementos finitos Abaqus®. Las curvas experimentales momento-rotación obtenidas concuerdan razonablemente con los resultados de los modelos propuestos, de modo que con este trabajo se ha establecido una base numérica sólida para estudios posteriores.
Armado Óptimo de Secciones de Hormigón Posteso
Authors: García-Villena F. A. , Carbonell-Márquez J. F.
Published: February 2015

Para un rango de valores de área de armadura activa y de excentricidad que cumplen los requisitos de tensión impuestos por el estado límite de servicio, se evalúa la armadura pasiva necesaria en estado límite último mediante la técnica RSD (Reinforcement Sizing Diagrams) teniendo en cuenta la presencia de la armadura activa. Se selecciona la solución que conduce a un valor mínimo del coste total de armado pasivo y activo.
Modelo mecánico para el cálculo de la resistencia a cortante de forjados de vigueta y bovedilla
Authors: Ribas C. , Cladera A.
Published: February 2015

El presente estudio plantea la evolución de un modelo de cálculo de resistencia a cortante existente en la bibliografía, para su aplicación a forjados de vigueta pretensada y bovedilla. El modelo previo evalúa la resistencia a cortante a partir de un área efectiva a cortante sobre una posición determinada de la fibra neutra. El nuevo modelo presenta como mejora principal, además de la interacción momento-cortante, la evaluación del efecto que tiene la capa de compresión en la resistencia a cortante, hecho que no se tiene en cuenta en la Instrucción EHE-08. Las predicciones del modelo se comparan con los resultados obtenidos en dos campañas experimentales de forjados de vigueta y bovedilla, obteniendo una correlación muy satisfactoria. Además, se observa que el modelo generaliza correctamente los resultados para otras tipologías de vigas, al compararlo con los resultados de campañas experimentales de vigas en T obtenidos de la bibliografía científico-técnica.
Un sistema de construcción para climas tropicales basado en pórticos arriostrados de bambú
Authors: Echeverria J. , Sampson C. , Vargas J. , Nilsson T. , Gil-Martin L. M. , Aschheim M.
Published: February 2015

En este artículo se presenta un sistema de construcción de viviendas de bajo coste para países tropicales en los cuales existe riesgo sísmico. Los objetivos de este trabajo son generar bajo impacto medioambiental (incluyendo las emisiones de carbono), empleo de materiales locales, preferiblemente reciclados, y mano de obra local. Para esta construcción se han empleado bloques de hormigón de baja resistencia (con agregado reciclado) junto con un innovador sistema de pórticos de bambú, botellas de plástico, vigas de bambú y cubiertas de chapa. El comportamiento dúctil de la estructura se garantiza introduciendo una barra de acero en la base del pórtico de bambú. Para proteger el bambú de la humedad, el pórtico se monta sobre un zócalo. Los resultados experimentales y analíticos obtenidos se utilizan para el diseño estructural del sistema frente a cargas de viento y sísmicas.
Levels of matrix metalloproteinase-7 and osteopontin in human gingival crevicular fluid during initial tooth movement
Authors: Oswal Dhaval , Sable Ravindranath B. , Patil Amol , Moge Alpana , Aphale Shama
Published: February 2015

Purpose

During orthodontic treatment, the early response of periodontal tissues to mechanical stress involves several metabolic changes that allow tooth movement. The purpose of this investigation was to evaluate osteopontin (OPN) and matrix metalloproteinase (MMP)-7 in the gingival crevicular fluid (GCF) of human teeth exposed to orthodontic force.

Materials and Methods

GCF samples were obtained from 15 healthy orthodontic patients (age, 12-22 years). In each patient, the left maxillary canine having the fixed orthodontic appliance was used as the test tooth, and its antagonist, with no appliance, was the control. Orthodontic force, 75 g was applied using a 16 × 22 beta titanium closing loop. The GCF sampling on the disto-buccal aspects of experimental and control tooth was performed at specific time interval with sterilized absorbent paper point. Processing was carried out with enzyme-linked immunosorbent assay to detect OPN and MMP-7 levels.

Results

The peak level of OPN was seen after 1 h application of orthodontic force which was 1280.36 pg/ml ± 185.02. The peak level of MMP-7 was seen at 0 h which was 598.3 pg/ml ± 107.5. The levels of OPN after 1 h increased to 1280.36 pg/ml ± 185.02, and they decreased at 24 h to 1012.86 pg/ml ± 168.47 (P= 0.001). The levels of MMP-7 after 1 h decreased to 478 pg/ml ± 99.7 which increased at 24 h to 526.9 pg/ml ± 99.2.

Conclusions

Orthodontic forces affect both OPN and MMP-7 protein levels on the compression side in a time-dependent fashion.
What Tumor Dynamics Modeling Can Teach us about Exploiting the Stem-Cell View for Better Cancer Treatment
Authors: Day Roger S.
Published: February 2015

The cancer stem cell hypothesis is that in human solid cancers, only a small proportion of the cells, the cancer stem cells (CSCs), are self-renewing; the vast majority of the cancer cells are unable to sustain tumor growth indefinitely on their own. In recent years, discoveries have led to the concentration, if not isolation, of putative CSCs. The evidence has mounted that CSCs do exist and are important. This knowledge may promote better understanding of treatment resistance, create opportunities to test agents against CSCs, and open up promise for a fresh approach to cancer treatment. The first clinical trials of new anti-CSC agents are completed, and many others follow. Excitement is mounting that this knowledge will lead to major improvements, even breakthroughs, in treating cancer. However, exploitation of this phenomenon may be more successful if informed by insights into the population dynamics of tumor development. We revive some ideas in tumor dynamics modeling to extract some guidance in designing anti-CSC treatment regimens and the clinical trials that test them.
The Yang–Mills $\alpha$-flow in vector bundles over four manifolds and its applications
Authors: Hong Min-Chun , Tian Gang , Yin Hao
Published: February 2015

In this paper we introduce an

\alpha

-flow for the Yang-Mills functional in vector bundles over four dimensional Riemannian manifolds, and establish global existence of a unique smooth solution to the

\alpha

-flow with smooth initial value. We prove that the limit of the solutions of the

\alpha

-flow as

\alpha\to 1

is a weak solution to the Yang-Mills flow. By an application of the

\alpha

-flow, we then follow the idea of Sacks and Uhlenbeck [22] to prove some existence results for Yang-Mills connections and improve the minimizing result of the Yang-Mills functional of Sedlacek [26]
Effective bounds in E. Hopf rigidity for billiards and geodesic flows
Authors: Bialy Misha
Published: February 2015

In this paper we show that in some cases the E.Hopf rigidity phenomenon allows quantitative interpretation. More precisely, we estimate from above the measure of the set

\mathcal M

swept by minimal orbits. These estimates are sharp, i.e. if

\mathcal M

occupies the whole phase space we recover the E.Hopf rigidity. We give these estimates in two cases: the first is the case of convex billiards in the plane, sphere or hyperbolic plane. The second is the case of conformally flat Riemannian metrics on a torus. It seems to be a challenging question to understand such a quantitative bound for Burago-Ivanov theorem.
Category $\mathcal O$ for quantum groups
Authors: Andersen Henning Haahr , Mazorchuk Volodymyr
Published: February 2015

In this paper we study the BGG-categories

\mathcal O_q

associated to quantum groups. We prove that many properties of the ordinary BGG-category

\mathcal O

for a semisimple complex Lie algebra carry over to the quantum case.

Of particular interest is the case when

q

is a complex root of unity. Here we prove a tensor decomposition for both simple modules, projective modules, and indecomposable tilting modules. Using the known Kazhdan-Lusztig conjectures for

\mathcal O

and for finite dimensional

U_q

-modules we are able to determine all irreducible characters as well as the characters of all indecomposable tilting modules in

\mathcal O_q

.

As a consequence of these results we are able to recover also a known result, namely that the generic quantum case behaves like the classical category

\mathcal O

.
A spectral sequence on lattice homology
Authors: Ozsváth Peter S. , Stipsicz András I. , Szabó Zoltán
Published: February 2015

Using the link surgery formula for Heegaard Floer homology we find a spectral sequence from the lattice homology of a plumbing tree to the Heegaard Floer homology of the corresponding 3-manifold. This spectral sequence shows that for graphs with at most two “bad” vertices, the lattice homology is isomorphic to the Heegaard Floer homology of the underlying 3-manifold.
Effect of Bleaching Agents on the Flexural Strength of Bovine Dentin
Authors: Guiraldo Ricardo Danil , Moura Sandra Kiss , Berger Sandrine Bittencourt , Pazenhagen Rafaela , Martinelli Natan , de Carvalho Rodrigo Varella
Published: February 2015

The aim of this study was to evaluate the effect of bleaching on the flexural strength of bovine dentin, using bleaching agents containing calcium (Whiteness HP Blue and Whiteness Class) and not containing calcium (Whiteness HP and Whiteness Perfect). Sixty bovine incisor tooth slices were obtained and divided into five experimental groups (n = 12), such as G1, untreated control group; G2, Whiteness HP Max [35% hydrogen peroxide (HP)]; G3, Whiteness HP Blue (35% HP); G4, Whiteness Class (7.5% HP) and G5, Whiteness Perfect (22% carbamide peroxide). Samples were submitted to bleaching treatment according to the manufacturers’ instructions. The control group remained in artificial saliva during bleaching. After bleaching, the enamel was removed and dentin specimens (7 mm length × 1.7 mm width × 0.5 mm thickness) were prepared. Samples were tested in a universal testing machine (EMIC). Data were analyzed by analysis variance (ANOVA) and Tukey's test. Differences between the groups were identified by ANOVA. The mean values (± standard deviation) for the experimental groups, such as (in MPa) G1 = 19.05 ± 2.68 a; G2 = 12.69 ± 4.52 b; G3 = 16.39 ± 3.74 ab; G4 = 14.90 ± 5.60 ab; and G5 = 12.71 ± 2.25 b. Groups with the same lowercase letter were significantly different from each other. The presence of calcium in bleaching agents appeared to influence the flexural strength of bovine dentin after bleaching treatment, for both office bleaching (35% HP) and home bleaching (7.5% HP).

How to cite this article

Berger SB, Pazenhagen R, Martinelli N, Moura SK, de Carvalho RV, Guiraldo RD. Effect of Bleaching Agents on the Flexural Strength of Bovine Dentin. J Contemp Dent Pract 2014;15(5):552-555.
Maxillary Dental Arch changes following the Leveling and Alignment Stage with Lingual and Labial Orthodontic Appliances: A Preliminary Report of a Randomized Controlled Trial
Authors: Hajeer Mohammad Y , Khattab Tarek Z , Farah Hassan , Al-Sabbagh Rabab
Published: February 2015

Background

No randomized controlled trial has tried to compare transverse dental arch changes between the lingual and labial orthodontic fixed appliances in the early stage of treatment.

Objective

To compare upper dental arch changes between lingual and labial fixed orthodontic appliances after leveling and alignment.

Design, setting

Parallel-groups randomized controlled trial on patients with class I moderate crowding teeth treated at the University of Al-Baath Dental School in Hamah, Syria.

Participants

About 102 patients with crowded teeth and class I malocclusion were evaluated and 58 patients fulfilled the inclusion criteria. Randomization was performed using computer generated tables; allocation was concealed using sequentially numbered opaque and sealed envelopes. About 52 participants were analyzed (mean age 21.5 ± 3.2 years). They were randomly distributed into two groups with 26 patients in each (1:1 allocation ratio).

Intervention

Lingual vs labial fixed orthodontic appliances were used.

Main outcome measure

Intercanine width, interpremolar width, intermolar width, and arch length were measured on study models before brackets’ placement (T1), at the end of leveling and alignment stage (T2).

Results

Statistically significant increase was detected in the intercanine width in the lingual group (1.99 mm, p < 0.001) and in the labial group (1.22 mm, p < 0.001). The interpremolar width had a significant decrease in the lingual group (–0.70 mm, p < 0.001), whereas there was a significant increase in this width in the labial group (1.73 mm, p < 0.001). A significant decrease in intermolar width was detected in the lingual group (–0.79 mm, p < 0.001) whereas a significant increase was observed in the labial group (0.81 mm, p < 0.001). The differences between the two groups were significant for all comparisons (p < 0.001).

Conclusion

The labial appliance produced a significant increase in all horizontal transverse arch dimensions, whereas in the lingual appliance group the intercanine width increased significantly in conjunction with a significant narrowing of posterior segments.

Funding

The University of Al-Baath Postgraduate Research Budget (UBDS-00786223-PG).

How to cite this article

Khattab TZ, Hajeer MY, Farah H, Al-Sabbagh R. Maxillary Dental Arch changes following the Leveling and Alignment Stage with Lingual and Labial Orthodontic Appliances: A Preliminary Report of a Randomized Controlled Trial. J Contemp Dent Pract 2014;15(5):561-566.
Bond Strength of Fiber-reinforced Posts to Deproteinized Root Canal Dentin
Authors: Furuse Adilson Yoshio , Cunha Leonardo Fernandes , Baratto Samantha Pugsley , Leonardi Denise Piotto , Haragushiku Gisele Aihara , Gonzaga Carla Castiglia
Published: February 2015

Aim

This study evaluated the push-out bond strength of cemented fiber posts after deproteinization of root canal dentin walls with NaOCl. The effect of the application of an antioxidant solution (sodium ascorbate) was also evaluated.

Materials and methods

A three-step etch-and-rinse (Scotchbond - 3M Espe) and a one-step self-etching adhesive (Xeno III - Dentsply Caulk) were evaluated. Thirty bovine incisor roots were divided into 3 groups:

a. Irrigation with physiologic solution (control).

b. Deproteinization with 10 minutes irrigation of 5% NaOCl.

c. Deproteinization with NaOCl followed by 10 minutes irrigation with 10% ascorbic acid. Fiber posts were cemented with a dual-cured cement (Rely X ARC - 3M ESPE). The push-out bond strength was evaluated after 24 hours of storage in distilled water. The data were analyzed with three-way ANOVA, one-way ANOVA and Tukey's test (á = 0.05).

Results

There were significant differences between groups (p < 0.05). The bond strength of Scotchbond was not influenced by the deproteinization. Xeno III showed a decrease in bond strength when deproteinized with 5% NaOCl (p < 0.05). For Xeno III, the subsequent irrigation with ascorbic acid was able to reverse the effect of the deproteinization. Considering the radicular thirds, the bond strength varied in the sequence—apical < middle < coronal.

Conclusion

Only the all-in-one adhesive was influenced by the deproteinization. Considering the respective control groups, both systems showed similar bond strength results.

Clinical significance

The decreased bond strength of the selfetching adhesive following deproteinization seams to be related to the oxidant effect of the NaOCl solution and the subsequent irrigation with ascorbic acid was able to reverse the effect of the deproteinization.

How to cite this article

Furuse AY, Cunha LF, Baratto SP, Leonardi DP, Haragushiku GA, Gonzaga CC. Bond Strength of Fiber-reinforced Posts to Deproteinized Root Canal Dentin. J Contemp Dent Pract 2014;15(5):581-586.
Spectrophotometric Evaluation of Color Changes of Bleach-shade Resin-based Composites after Staining and Bleaching
Authors: Farah Rafat Ibrahim , Elwi Hytham
Published: February 2015

Spectrophotometric evaluation of color changes of Bleachshade resin-based composites after staining and bleaching.

Aim

The aim of this study was to evaluate the color stability of two commercially available bleach-shade resin composites (RC) after exposure to 3 storage solutions and the effect of 3 bleaching agents on the color stability and stain removal from stained RC.

Materials and methods

Two bleach-shade RC were evaluated in this study, including a nanofilled RC, FiltekTM Z350 XT (FZ), and a nanohybrid RC, Tetric® N-Ceram (TC), in the extra-white body (shade) (XWB) and L shades, respectively. Twenty-seven disk-shaped specimens, each measuring 12 mm in diameter and 2 mm in thickness, were prepared for each RC, with a total of 54 specimens. Specimens were randomly allocated into 3 groups of 9 specimens each and immersed in 3 storage solutions (distilled water, tea and coffee) for 7 days period. The 9 specimens in each staining group were further divided into 3 subgroups. Specimens in each subgroup (n = 3) were bleached using one of the bleaching agents (10 and 16% Zoom NiteWhite amorphous calcium phosphate (ACP), and Zoom 2 chairside with light activation) for 5 days period. The specimen colors were measured with spectrophotometer. The measurements were performed on each sample three times at baseline, after staining, and after bleaching. Color was expressed using the commission international de I'Eclairage (CIE) L*a*b* color space. The color differences (ÄE) between the three measurements were calculated and the results were statistically analyzed using Two-way and Three-way analysis of variance (ANOVA) and Tukey's posthoc tests. Level of significance was set at p < 0.05.

Results

Tetric® N-ceram materials demonstrated significantly less color change than the FZ and the color change, which was greater after storage in coffee compared to tea, was statistically significant. The bleaching agents significantly influence the color changes of composite specimens. All groups showed (ÄE) values below 3.3 after bleaching, except for ‘Zoom 2 chairside’ with light activation groups, which is shown clinically unacceptable lighter shade (ÄE >3.3).

Conclusion

Bleach-shade composites showed significant discoloration (ÄE > 3.3) after being immersed into coffee and tea solutions. Nanofilled composites discolored more than nanohybrid composites, and carbamide peroxide-based bleaching agents were effective in reducing the discoloration to a clinically acceptable value (ÄE > 3.3).

How to cite this article

Farah RI, Elwi H. Spectrophotometric Evaluation of Color Changes of Bleach-shade Resin-based Composites after Staining and Bleaching. J Contemp Dent Pract 2014;15(5):587-594.
Assessment of the Relationship between the Maxillary Sinus Floor and Maxillary Posterior Teeth Roots using Cone Beam Computed Tomography
Authors: Shokri Abbas , Lari Sima , Yousefi Faezeh , Hashemi Laya
Published: February 2015

Aim

This study was conducted to assess the vertical and horizontal relationship between the maxillary sinus floor and maxillary posterior teeth roots using cone beam computed tomography.

Materials and methods

In this cross-sectional study, the CBCT images presented in the radiology department of Hamadan dental school was used. From 450 observed CBCT, 340 of them did not have the inclusion criteria of the study and ultimately 110 CBCT were selected. Totally 214 first premolars, 217-second premolars, 220 first molars and 220-second molars were included. For evaluating the relationship between the maxillary sinus floor and the posterior maxillary teeth, the classification implemented in the study of Jung in 2009 was used. The relation was evaluated by two radiologists twice with a 2-week time interval.

Results

One hundred and ten patients with a mean age of 31.06 ± 9.7 years were assessed. Type 0 relationship (the maxillary sinus floor is located above the root tip) was most frequently observed with the first and second premolars. The most common type observed in the first and second molars was type 3 (apical protrusion is seen over the maxillary sinus floor). The relation between different types and gender was statistically meaningful, while no statistically significant difference was found between the right and left side assessments.

Conclusion

This study showed that although most of the teeth did not have contact with the sinus floor, but the more posterior the maxillary teeth, the more probability for root protruding into the maxillary sinus. It also confirmed that protrusion of teeth roots into the maxillary sinus is more common in male than female.

Clinical significance

Knowing the anatomical relation between the posterior teeth and the maxillary sinus, help the clinician in preoperative treatment planning of the posterior maxillary teeth and avoid problems that may occur during dental practice.

How to cite this article

Shokri A, Lari S, Yousefi F, Hashemi L. Assessment of the Relationship between the Maxillary Sinus Floor and Maxillary Posterior Teeth Roots using Cone Beam Computed Tomography. J Contemp Dent Pract 2014;15(5): 618-622.
Morphologic Variations in Mandibular Premolars: A Report of Three Cases
Authors: Bhardwaj Anuj , Kottoor Jojo , Albequerque Denzil Valerian , Velmurugan Natanasabapathy
Published: February 2015

Aim

To report cases with morphologic variations in mandibular premolars.

Background

Mandibular premolars have earned the reputation for having aberrant anatomy. The occurrence of three canals with three separate (type V, Vertucci) foramina in mandibular premolars is very rare. In this report, three cases are presented involving the root canal treatment of mandibular premolars with three different root and canal configurations. The present report also emphasizes the use of the dental operating microscope to enhance visualization.

Case description

Correlation between radiographic findings, use of dental operating microscope and knowledge of aberrant anatomy helps to identify, locate and treat the aberrant anatomy of the tooth.

Clinical significance

The treatment was successful as all canals were identified and filled and also as evidenced by relief of symptoms.

Conclusion

Success is largely dependent on the use of magnification, which aided in identifying the location of the three individual root canal orifices; thus emphasizing the need to familiarize ourselves with dental microscopy, to obtain maximal anatomic information in endodontic practice.

How to cite this article

Bhardwaj A, Kottoor J, Albequerque DV, Velmurugan N. Morphologic Variations in Mandibular Premolars: A Report of Three Cases. J Contemp Dent Pract 2014;15(5): 646-650.
Esthetic and Function Improvement by Direct Composite Resins and Biomimetic Concept
Authors: Paschoal Marco Aurelio , Santos-Pinto Lourdes , Nagle Mauricio , Ricci Weber Adad
Published: February 2015

Aim

This case report describe a resin layering restorative technique based on biomimetic concept to improve esthetics in a patient with dental defects that affected both enamel and dentin in anterior teeth.

Background

Severe structural defect in anterior teeth compromises esthetics and it is a high challenge to become the defect imperceptible after the restoration.

Case description

A clinical sequence of applying different composite resin layers allowed the reproduction of the interaction between hard dental tissues and the restorative material.

Conclusion

This technique achieved a satisfactory final esthetic outcome, preserving sound teeth structure and at same time, improved the quality of life of the young patient.

Clinical significance

The utilization of the biomimetic concept to increase a disharmonic smile with dental defects is based in a conservative approach, which reached a satisfactory and esthetic outcome.

How to cite this article

Paschoal MA, Santos-Pinto L, Nagle M, Ricci WA. Esthetic and Function Improvement by Direct Composite Resins and Biomimetic Concept. J Contemp Dent Pract 2014;15(5):654-658.
Enjoyment Takes Time: Some Implications for Choice Theory
Authors: Nisticò Sergio
Published: February 2015

The paper suggests that casting the choice problem in terms of alternative time-consuming activities can foster the fruitful cross-fertilization between economics and psychology along the lines suggested by Scitovsky in the Joyless Economy. The first part emphasizes how mainstream, utility-based choice theory has eradicated “time” from the analysis, in contrast with the seminal contribution to the subjective theory of value proposed by Gossen in 1858. The limits of Becker’s well-known approach to time-use are also analyzed. The second part opens with the presentation of an alternative approach based on activities, intended as productive processes allowing for pleasant time to be produced by consuming “direct” unpleasant time plus the “indirect” amount of unpleasant time equivalent to the market goods used up as inputs (Nisticò, Production of (Pleasant) Time by Means of (Unpleasant) Time: Some Notes on Consumption Theory and Time Use, 2014). Finally, the approach is applied to an intertemporal context by drawing on Hicks’s temporary equilibrium method. Scitovsky’s distinction between defensive and creative activities is discussed in conclusion, suggesting that individuals might refrain from engaging in more skilled, time-consuming activities because of the attractiveness of a certain, higher present-period rate of return of less skilled, goodsintensive activities.
Increasing concentrations of dichloromethane, CH2Cl2, inferred from CARIBIC air samples collected 1998–2012
Authors: Leedham Elvidge Emma C. , Oram D. E. , Laube J. C. , Baker A. K. , Montzka S. A. , Humphrey S. , O'Sullivan D. A. , Brenninkmeijer C. A. M.
Published: February 2015

Abstract. Atmospheric concentrations of dichloromethane, CH2Cl2, a regulated toxic air pollutant and minor contributor to stratospheric ozone depletion, were reported to have peaked around 1990 and to be declining in the early part of the 21st century. Recent observations suggest this trend has reversed and that CH2Cl2 is once again increasing in the atmosphere. Despite the importance of ongoing monitoring and reporting of atmospheric CH2Cl2, no time series has been discussed in detail since 2006. The CARIBIC project (Civil Aircraft for the Regular Investigation of the atmosphere Based on an Instrument Container) has analysed the halocarbon content of whole-air samples collected at altitudes of between ~ 10–12 km via a custom-built container installed on commercial passenger aircraft since 1998, providing a long-term record of CH2Cl2 observations. In this paper we present this unique CH2Cl2 time series, discussing key flight routes which have been used at various times over the past 15 years. Between 1998 and 2012 increases were seen in all northern hemispheric regions and at different altitudes, ranging from ~ 7–10 ppt in background air to ~ 13–15 ppt in regions with stronger emissions (equating to a 38–69% increase). Of particular interest is the rising importance of India as a source of atmospheric CH2Cl2: based on CARIBIC data we provide regional emission estimates for the Indian subcontinent and show that regional emissions have increased from 3–14 Gg yr−1 (1998–2000) to 16–25 Gg yr−1 (2008). Potential causes of the increasing atmospheric burden of CH2Cl2 are discussed. One possible source is the increased use of CH2Cl2 as a feedstock for the production of HFC-32, a chemical used predominantly as a replacement for ozone-depleting substances in a variety of applications including air conditioners and refrigeration.