A reproducao de detalhes da superficie e a estabilidade dimensional foram avaliadas usando microscopia optica na linha 50 μm com 25 mm de comprimento, de acordo com a norma ISO 1563. Os moldes foram preenchidos com gesso dental (Durone IV). Os moldes foram removidos 2 minutos apos a perda de consis - tencia pegajosa e preenchidos imediatamente ou armazenados em frascos fechados com temperatura (37☌) e umidade relativa (100%) controladas por 1, 3 ou 5 dias. Os moldes foram preparados sobre matriz contendo linha de 50 μm (norma ISO 1563) realizado sob pressao com moldeira de metal perfurada. Influência dos alginatos e tempo de armazenamento na reprodução de detalhes da superfície e estabilidade dimensional de modelos de gessoĮste estudo comparou a reproducao de detalhes da superficie e estabilidade dimensional de modelos de gesso obtidos a partir de diferentes alginatos (Cavex ColorChange, Hydrogum 5, Jeltrate Plus) e com diferentes tempos de armazenagem (1, 3, e 5 dias) para modelos obtidos de moldes que foram preenchidos imediatamente sem tempo de armazenagem. Key words: Dental impression materials Alginates Dimensional measurement accuracy. In conclusion, storing the mold for five days prior to filling did not change the surface detail reproduction or dimensional accuracy of the alginates examined in this study. There was no statistically significant difference in the mean dimensional accuracy values of stone models made from molds composed of different alginate impression materials and with different storage times (p = 0.989). The 50-μm wide line (ISO 1563 standard) was completely reproduced by all alginate impression materials regardless of the storage time. The dimensional accuracy results (%) were subjected to analysis of variance.
Surface detail reproduction and dimensional accuracy were evaluated using optical microscopy on the 50-μm wide line, which was 25 mm in length, according to ISO 1563 standard. The molds were filled with dental plaster (Durone IV). The molds were removed 2 minutes after loss of sticky consistency and either filled immediately or stored in closed jars at 100% relative humidity and 37☌ for 1, 3, or 5 days. The molds were prepared over a matrix containing 50-μm line, (ISO 1563 standard) under pressure with a perforated metal tray. Sinhoreti 2ġ Department of Restorative Dentistry, School of Dentistry, University North of Parana, Londrina, PR, BrazilĢ Department of Restorative Dentistry, Piracicaba Dental School, State University of Campinas, Piracicaba, SP, BrazilĬORRESPONDENCE Dr.Ricardo Danil Guiraldo University of North Parana - UNOPAR Rua Marselha, 183 86041-140 - Londrina, PR - Brazil e-mail: study compared the surface detail reproduction and dimensional accuracy of stone models obtained from molds prepared using different alginate impression materials (Cavex ColorChange, Hydrogum 5, or Jeltrate Plus) and with different storage times (1, 3, and 5 days) to models from molds that were filled immediately with no storage time. Moreti 1, Julia Martinelli 1, Sandrine B. Influence of alginate impression materials and storage time on surface detail reproduction and dimensional accuracy of stone models
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