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Effect of storage period on the accuracy of elastomeric impressions
Franco, Eduardo Batista; Cunha, Leonardo Fernandes da; Benetti, Ana Raquel.
Afiliação
  • Franco, Eduardo Batista; University of São Paulo. Bauru School of Dentistry. Department of Operative Dentistry, Endodontics, and Dental Materials. Bauru. BR
  • Cunha, Leonardo Fernandes da; University of São Paulo. Bauru School of Dentistry. Department of Operative Dentistry, Endodontics, and Dental Materials. Bauru. BR
  • Benetti, Ana Raquel; University of São Paulo. Bauru School of Dentistry. Department of Operative Dentistry, Endodontics, and Dental Materials. Bauru. BR
J. appl. oral sci ; 15(3): 195-198, May-June 2007. ilus, tab
Artigo em Inglês | LILACS-Express | LILACS | ID: lil-457282
Biblioteca responsável: BR1.1
ABSTRACT

AIMS:

To investigate the effect of the storage period on the accuracy of recently developed elastomeric materials.

METHODS:

Simultaneous impressions of a steel die were taken using a polyether (I Impregum Soft Heavy and Light body, 3M ESPE) and vinyl polysiloxane (P Perfectim Blue Velvet and Flexi-Velvet, J.Morita). The trays were loaded with the heavy-bodied impression materials while the light-bodied impression materials were simultaneously spread on the steel die. The impressions were poured after 2 hours, 24 hours, and 7 days. Impressions were stored at approximately 55 percent relative humidity and room temperature. Ten replicas were produced for each experimental condition (n=60). Accuracy of the stone dies was assessed with a depth-measuring microscope. The difference in height between the surface of the stone die and a standard metallic ring was recorded in micrometers at four demarcated points, by two independent examiners. Data were submitted to two-way ANOVA and Tukey test (a = 0.05).

RESULTS:

Significant differences were found among the groups. Smaller discrepancies were observed when pouring was performed up to 24 hours (I-2h= 65.0 ± 15.68 µm; I-24h= 81.6 ± 11.13 µm) for the polyether, and up to 7 days for the vinyl polysiloxane (P-2h= 79.1 ± 13.82 µm; P-24h= 96.8 ± 6.02 µm; P-7d= 81.4 ± 4.3 µm). Significant dimensional discrepancies, however, were observed when polyether was stored for 7 days (I-7d= 295.3 ± 17.4 µm).

CONCLUSION:

Storage may significantly affect the dimensional accuracy of impressions and, thus, a maximum period and storage condition should be specified for the recently developed materials.
Texto completo: Disponível Coleções: Bases de dados internacionais Base de dados: LILACS Idioma: Inglês Revista: J. appl. oral sci Assunto da revista: Odontologia Ano de publicação: 2007 Tipo de documento: Artigo País de afiliação: Brasil Instituição/País de afiliação: University of São Paulo/BR

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Texto completo: Disponível Coleções: Bases de dados internacionais Base de dados: LILACS Idioma: Inglês Revista: J. appl. oral sci Assunto da revista: Odontologia Ano de publicação: 2007 Tipo de documento: Artigo País de afiliação: Brasil Instituição/País de afiliação: University of São Paulo/BR
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