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1.
Braz. j. oral sci ; 15(3)July-Sept. 2016. tab
Article Dans Anglais | LILACS, BBO | ID: biblio-875098

Résumé

Aim: Evaluate the dimensional accuracy of stone casts of a partially edentulous mandibular arch made by two impression techniques (1-step putty/light-body and 2-step putty/light-body) using addition and condensation silicones. Methods: A partially edentulous steel stainless cast with four markings on teeth 33, 37, 43, and 47 was used to obtain the impressions. The transverse (33-43 and 37-47) and anteroposterior (33-37 and 43-47) distances were measured by measuring microscope (30x magnification; 0.5µm accuracy). For the 1-step putty/light-body technique, both viscosities of the impression materials were handled together. For the 2-step putty/light-body technique, the impression materials of different viscosities were handled separately and a polypropylene spacer (2 mm thick) was used to create a relief. The same distances were measured on stone casts (n = 5). The values were submitted to normality test (Kolmogorov-Smirnov) and analyzed statistically by three-way ANOVA and Tukey's (5%). Results: All distances showed shrinkage (negative linear changes). The addition silicones showed better accuracy than condensation silicones (p<0.05) and no significant difference was found between the impression techniques (p>0.05). The edentulous zone (43-47) presented worst dimensional accuracy results. Conclusions: The accuracy of the casts is more related to the impression material than impression technique. (AU)


Sujets)
Technique de prise d'empreinte , Précision de la mesure dimensionnelle , Siloxane élastomère , Arcade dentaire , Mandibule
2.
Rev. bras. odontol ; 61(3/4): 152-154, 2004. tab
Article Dans Portugais | LILACS, BBO | ID: lil-412338

Résumé

Este estudo avaliou a rugosidade superficial, a resistências à compressão e à tração e a liberação de flúor de dois cimentos de ionômero de vidro híbridos e de um compômero. Os corpos de prova foram confeccionados de acordo com as especificações de cada ensaio e de cada fabricante. Os autores concluíram que os cimentos de ionômero de vidro híbridos testados possuem as propriedades mecânicas avaliadas semelhantes entre si e inferiores ao compômero testado. Este apresentou a menor liberação de flúor. Não houve diferença estatisticamente significativa entre os ionômeros


Sujets)
Ciment ionomère au verre/normes , Compomères/normes , Analyse du stress dentaire , Fluor/normes , Test de matériaux , Phénomènes physiques , Résistance à la compression , Résistance à la traction
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