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Dimensional stability of a novel polyvinyl siloxane impression technique
Leão, Moira Pedroso; Pinto, Camila Paloma; Sponchiado, Ana Paula; Ornaghi, Bárbara Pick.
Afiliação
  • Leão, Moira Pedroso; Universidade Positivo. School of Dentistry. Area of Prosthodontics. Curitiba. BR
  • Pinto, Camila Paloma; Universidade Positivo. School of Dentistry. Area of Prosthodontics. Curitiba. BR
  • Sponchiado, Ana Paula; Universidade Positivo. School of Dentistry. Area of Prosthodontics. Curitiba. BR
  • Ornaghi, Bárbara Pick; Universidade Positivo. School of Dentistry. Area of Prosthodontics. Curitiba. BR
Braz. j. oral sci ; 13(2): 118-123, Apr-Jun/2014. tab, graf
Article em En | LILACS | ID: lil-715602
Biblioteca responsável: BR218.1
ABSTRACT

AIM:

To introduce a modification of the reline impression technique (MRIT), and compare the dimensional changes of impressions obtained by MRIT and by conventional reline impression technique (CRIT).

METHODS:

An acrylic resin tablet was milled by a CAD-CAM system to simulate three abutments (A, B and C) with different distances among them. The abutments were molded using both impression techniques. For MRIT, before completing the putty silicone polymerization, the relieve procedure was made by compression and it was immediately repositioned to complete the polymerization. Impressions were stored dry at room temperature for different periods (immediately, 1 h, 2 days and 7 days). The distances were obtained by scanning. The differences between the impressions and their respective matrix reference measurements were calculated to determine the dimensional changes. Data were subjected to ANOVA and Tukey's test (p<0.05).

RESULTS:

For AB and BC distances, there was no statistically significant difference between CRIT and MRIT (p=0.0597 and p=0.2167, respectively). For AC, there was statistically significant difference between the techniques for the immediate storage time (p=0.006). In general, for CRIT the material showed expansion, while for MRIT it showed contraction.

CONCLUSIONS:

It was verified that the addition silicon impressions obtained by both impression techniques showed dimensional stability, except for the immediate time-point...
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Texto completo: 1 Coleções: 01-internacional Base de dados: LILACS Assunto principal: Polivinil / Pesquisa / Siloxanas / Técnica de Moldagem Odontológica / Materiais para Moldagem Odontológica / Precisão da Medição Dimensional Idioma: En Revista: Braz. j. oral sci Assunto da revista: ODONTOLOGIA Ano de publicação: 2014 Tipo de documento: Article País de afiliação: Brasil País de publicação: Brasil

Texto completo: 1 Coleções: 01-internacional Base de dados: LILACS Assunto principal: Polivinil / Pesquisa / Siloxanas / Técnica de Moldagem Odontológica / Materiais para Moldagem Odontológica / Precisão da Medição Dimensional Idioma: En Revista: Braz. j. oral sci Assunto da revista: ODONTOLOGIA Ano de publicação: 2014 Tipo de documento: Article País de afiliação: Brasil País de publicação: Brasil