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In vitro effect of experimental nanocomposites solutions on the prevention of d...

Abstract This study aimed to evaluate the in vitro effect of a single application of experimental nanocomposite solutions on the prevention of dental caries around orthodontic brackets. The specimens were exposed to mesoporous silica (MS) nanocomposites containing fluoride by association with titanium tetrafluoride (TiF4) or sodium fluoride (NaF). Nanocomposites also could contain calcium and groups were descri...

Fallopian tube vascularization observed by microfocus computed tomography

Proportional vascularization along the fallopian tubes and ovarian fimbria: ass...

Abstract Objective: To evaluate and reconstruct three-dimensional images of vascularization along the fallopian tube (FT), as well as to determine its relationship with the ovary and ovarian fimbria, and to quantify the blood vessels along the FT according to its anatomical segments, using confocal microtomography (micro-CT). Materials and Methods: Nine specimens (six FTs and three FTs with ovaries) were fixed ...

Effect of Aging on Dentinal Crack Formation after Treatment and Retreatment Pro...

Abstract In order to evaluate the volume of dentinal cracks taking into account the age of the dentin and the type of file system used for endodontic procedures, forty freshly extracted single-rooted lower incisive teeth presenting similar root volume, were divided into two groups according to the age of the patient: Group Young (18 - 30 years old) and Group Old (60 years old or more). Each specimen was scanned...

On the Causality Between Dentinal Defects and Root Canal Preparation: A Micro-C...

Abstract This study aimed to evaluate the cause-effect relationship between canal preparation with ProTaper Universal (PTU) system and dentinal defects formation using micro-computed tomography (micro-CT) analysis. Forty mesial canals of mandibular molars with a type II Vertucci's canal configuration were scanned at an isotropic resolution of 14.16 µm. The sample was assigned to an experimental (n = 30) and a c...

Micro-CT Evaluation of Non-instrumented Canal Areas with Different Enlargements...

The aim of this study was to compare the percentage of non-instrumented area of root canals prepared with different enlargements using single-file reciprocating systems (Reciproc and WaveOne) and a conventional multi-file rotary (BioRaCe) system by micro-computed tomographic analysis. Thirty mesial roots of mandibular molars with moderate curvature (10° to 20°) presenting a type II Vertucci canal configuration ...

X-Ray diffraction technique applied to study of residual stresses after welding...

Duplex stainless steel is an example of composite material with approximately equal amounts of austenite and ferrite phases. Difference of physical and mechanical properties of component is additional factor that contributes appearance of residual stresses after welding of duplex steel plates. Measurements of stress distributions in weld region were made by X-ray diffraction method both in ferrite and austenite...

Análise de peroleiras e cachimbos cerâmicos provenientes de escavações arqueoló...

Este artigo apresenta os resultados da análise de fragmentos de peroleiras e cachimbos cerâmicos, oriundos de escavações arqueológicas realizadas na região compreendida entre os rios Macacu e Caceribu, no estado do Rio de Janeiro, utilizando as técnicas de Fluorescência de Raios X (XRF), Microscopia Eletrônica de Varredura, com Espectroscopia por Dispersão em Energia (SEM-EDS) e estatística multivariada. Alguma...

Influence of estrogen deficiency and tibolone therapy on trabecular and cortica...

PURPOSE: To verify the effects of tibolone administration on trabecular and cortical bone of ovariectomized female rats by computed radiography system (CRS). METHODS: The experiment was performed on two groups of rats previously ovariectomized, one received tibolone (OVX+T) while the other did not (OVX), those groups were compared to a control group (C) not ovariectomized. Tibolone administration (1mg/day) bega...

Aplicação da lógica fuzzy para correção de dados de perfil de raios gama e corr...

Este trabalho apresenta os resultados de um estudo sobre a porosidade de testemunhos da Formação Resende na região da Bacia de Resende (Rio de Janeiro). A primeira etapa envolveu a seleção, desbaste do material (testemunhos) e preparação da amostra para caracterização no porosímetro e obtenção da porosidade efetiva. O material estudado é um arenito, friável, de granulometria grossa a muito fina retirado de três...