2012
DOI: 10.1590/s1806-83242012000500005
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Influence of delayed pouring on irreversible hydrocolloid properties

Abstract: The aim of this study was to evaluate the physical properties of irreversible hydrocolloid materials poured immediately and after different storage periods. Four alginates were tested: Color Change (Cavex); Hydrogum (Zhermack); Hydrogum 5 (Zhermack); and Hydro Print Premium (Coltene). Their physical properties, including the recovery from deformation (n = 3), compressive strength (n = 3), and detail reproduction and gypsum compatibility (n = 3), were analyzed according to ANSI/ ADA specification no. 18. Specim… Show more

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Cited by 22 publications
(20 citation statements)
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“…In the so‐called “conventional” technique, a cast is produced after an impression has been made with a tray filled with an impression material. Impressions made with irreversible hydrocolloids should be poured immediately, as delayed pouring negatively influences their dimensional stability and precision . Elastomeric impression materials available for final impressions are vinyl siloxanether, vinylpolysiloxane, silicone, and polyether .…”
mentioning
confidence: 99%
“…In the so‐called “conventional” technique, a cast is produced after an impression has been made with a tray filled with an impression material. Impressions made with irreversible hydrocolloids should be poured immediately, as delayed pouring negatively influences their dimensional stability and precision . Elastomeric impression materials available for final impressions are vinyl siloxanether, vinylpolysiloxane, silicone, and polyether .…”
mentioning
confidence: 99%
“…Além da estabilidade dimensional, outras propriedades do alginato devem ser levadas em consideração quando os mesmos são armazenados, tais como recuperação da deformação, resistência à compressão, reprodutibilidade de detalhes e compatibilidade do gesso. Rodrigues et al 23 , ao avaliarem estas propriedades, recomendam o vazamento imediato.…”
Section: Discussionunclassified
“…Pode ser observado pelos trabalhos de pesquisadores 13,14,15,16 que os novos alginatos sofrem alterações antes do tempo previsto pelos fabricantes. Devemos considerar ainda que todas as mensurações dos trabalhos referidos foram realizadas em modelos de gesso, obtidos de suas respectivas impressões, e que estes sofrem expansão, portanto com medidas não coincidentes com as dos moldes.…”
Section: Discussionunclassified