Microstructure, topography, surface roughness, fractal dimension, internal and marginal adaptation of pressed and milled lithium-disilicate monolithic restorations

Publication date: Available online 15 June 2019Source: Journal of Prosthodontic ResearchAuthor(s): Ricardo Schestatsky, Camila Pauleski Zucuni, Kiara Serafini Dapieve, Thiago Augusto Lima Burgo, Aloísio Oro Spazzin, Ataís Bacchi, Luiz Felipe Valandro, Gabriel Kalil Rocha PereiraAbstractPurposeTo characterize the effect of two processing techniques (pressing and CAD/CAM — Computer Aided Design/Computer Aided Machining) of lithium-disilicate (LD) based crowns on the microstructure, topography, roughness, fractal dimension, internal and marginal adaptation.MethodsOne-hundred identical preparations for monolithic crowns were made with dentin analogue material (G10 epoxy resin). One of the preparations was scanned and a monolithic crown in lithium-disilicate was planned in the CAD system. Fifty crowns were milled in a wax pattern and subjected to pressing (IPS e.max Press), while 50 crowns were machined at CAD/CAM (IPS e.max CAD) and posteriorly crystallized. Internal and marginal adaptation were assessed via replica technique at four manufacturing moments (Milled wax pattern; LDPRESS; Milled LDCAD; Crystallized LDCAD) and considering 5 regions (margin, cervico-axial angle, axial wall, axial-occlusal angle and occlusal wall). Complementary analysis considering microstructure and topography, roughness and fractal dimension were performed in Scanning Electron Microscopy (SEM) and Atomic Force Microscopy (AFM).ResultsThe processing technique resulted in different ...
Source: Journal of Prosthodontic Research - Category: Dentistry Source Type: research

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Source: Cancer Epidemiology - Category: Cancer & Oncology Source Type: research
Publication date: Available online 18 July 2019Source: Materials Today: ProceedingsAuthor(s): Kutraleeswaran Manickam, Venkatachalam Muthusamy, Saroja Manickam, T.S. Senthil, Gowthaman Periyasamy, Shankar ShanmugamAbstractTiO2 is one of the common materials used for solar cells, diodes, different types of gas sensors, optoelectronic devices, etc., TiO2 is widely used in photovoltaic devices due to interesting optical and electrical properties. In this work, nanocrystalline TiO2 thin films have been prepared by sol gel dip coating method. X-ray diffraction pattern showed the formation of anatase phase of TiO2. The scanning ...
Source: Materials Today: Proceedings - Category: Materials Science Source Type: research
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