Comportamento dimensional de gessos dos tipos IV e V na confecção de modelos obtidos de moldes em duas diferentes temperaturas: 22 e 35ºC / Dimensional behavior of types IV and V gypsum when building models obtained form molds in two different temperatures: 22 and 35º C

RESUMO

O experimento foi idealizado com objetivo de comparar os procedimentos do reaquecimento de moldagens ao vazamento de moldes resfriados com gesso dos tipos IV e V. Os materiais utilizados foram Adsil Vigodent, Express e Impregum 3M Espe, Zeta Plus e Oranwash Zhermack. Os moldes passaram, sem exceção, por uma temperatura de 35ºC onde foram obtidos, para 22ºC onde foram armazenados. O delineamento dos experimentos seguiu a divisão dos seguintes grupos quanto ao tratamento térmico Alguns grupos receberam vazamento dos gessos IV e V após o reaquecimento dos moldes para 35ºC, enquanto outros receberam os mesmos gessos à 22ºC. A técnica de moldagem selecionada para o primeiro experimento foi de dupla mistura...

ABSTRACT

The experiments It was conceived with the objective of to compare the procedures of reheating moldings with the leaking of cooled molds with types IV and V gypsum.The materials used were Adsil Vigodent, Express e Impregum 3M Espe, Zeta Plus and Oranwash Zhermack. The molds passed without exception, from a temperature of 35ºC where they were obtained, to 22ºC, where they were stored. The delimitation of all experiments followed the division of the following groups as of the thermic treating Some groups received gypsum type IV and V leaking after the reheating of the molds to 35ºC, whilst others received the same gypsums at 22ºC temperature. The selected molding technique for the first experiment was of a double-mix. The used elastomers were Impregum 3M Espe, Express 3M Espe and Adsil Vigodent, and the impressions materials were the gypsum Vel-Mix Kerrande Exadur Polidental. The statistical analysis showed a significance in the cooled impressions and leaked with type V gypsum, and that the reheating of the impressions produced adequate models when these are leaked whth type IV gypsum. On the second experiment, the used molding technique was the double molding.The molding materials were Zeta Plus and Oranwash Zhermak, Adsil Vigodent and Express 3M Espe this technique is known as double molding. The...