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Evaluation of the Marginal Adaptation in Metal Crowns Using CAD/CAM and Manual Wax Patterns

Microscopy Research 2015年第2期3卷 26-32页

作者： Alan Sepulveda-Rodríguez Felipe Guerrero-Martínez César Gaitan-Fonseca Takashi Komabayashi enrique reyes-vela David Masuoka Department of Stomatology Universidad Autónoma de Aguascalientes Aguascalientes Mexico Faculty of Dentistry Universidad Autónoma de San Luis Potosí San Luis Potosí Mexico Department of Endodontics West Virginia University Charleston USA

The aim of this study is to evaluate the maximum and minimum distances between the model and the cast crown of three techniques using Scanning Electron Microscopy (SEM). Three technique groups were used for this study: group A (control), traditional manual wax patterns;group B, dipping wax patterns;group C, resin patterns made with CAD/CAM. For each group, 10 samples were made using the same model, and then metal cast. Marginal accuracies of the samples were evaluated by performing gap measurements using SEM with a magnification of 1200× (minimum distance). The data were statistically analyzed using the one-way analysis of variance (ANOVA) at the 0.05 significance level. The average (standard deviation) of the minimum distance [μm] was 22.5 (12.1), 9.9 (4.3), and 14.7 (6.6), in groups A, B, and C, respectively. The average standard deviation of gap area [μm2] was 21667.2 (3476.4), 9906.4 (1512.1), and 16048.8 (8123). In the minimum distance comparison, groups A and B (p = 0.006) showed statistically significant results. In the gap area comparison, there was no statistical significance among groups A, B, and C (p = 0.174). The marginal adaptations of all three techniques were within a reported clinically acceptable range of margin.

关键词： Marginal Adaptation CAD/CAM Metal Caps Wax Pattern

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Construction and Characterization of Dye-Sensitized Solar Cells

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材料科学与工程（中英文B版） 2013年第8期3卷 535-538页

作者： Pablo Cesar Carbo vela enrique Martinez Pena Juan Lopez Hemandez Eddie Nahflm Armendariz Mireles Jose Amparo Rodriguez Garcia enrique Rocha Rangel Polytechnic University of Victory Victoria City Tamaulipas 87138 Mexico

This work describes the development of solar cells manufactured with different natural dyes, with the purpose to determine their photoelectrochemical properties, employing for that virtual instrumentation. Data acquisitions and statistical process of the same, are realized through graphical programming software. The system has facilities for measurements, acquisitions and to see permanently in the computer display, information about the performance of the solar cells, as well as environmental parameters such as; temperature and the I-V characteristic curve of the solar cell. This monitoring system pretends to be part of a permanent station for monitoring variables of the manufactured solar cells.

关键词：染料敏化太阳能电池表征建筑监控系统数据采集图形化编程光电特性虚拟仪器

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