Disinfection of irreversible hydrocolloid impressions with sodium hypochlorite steam: Assessment of surface roughness and dimensions of gypsum models

  • Carmem Dolores Vilarinho Soares de Moura
  • Walter Leal de Moura
  • Fabiana Mantovani Gomes França
  • Gregório Antônio Soares Martins
  • Lorenna Bastos Lima Verde Nogueira
  • Raquel Vírginia Zanetti
Keywords: Biosafety, sodium hypochlorite, gypsum

Abstract

Purpose: To evaluate the surface roughness and dimensional stability of types III and IV gypsum models, obtained from irreversible hydrocolloid impressions after disinfection with 5.25% sodium hypochlorite steam. Methods: The impressions to obtain type III and type IV gypsum models were divided into 3 groups: Group 1 (disinfection with 5.25% sodium hypochlorite steam for 10 minutes); Group 2 (simulated disinfection with distilled water steam) and Group 3 (no treatment). To measure the dimensional changes with a digital caliper, 36 models (18 for each type of gypsum) were cast according to a stainless steel master model with four pillars. For the surface roughness measurement, 36 gypsum models were cast from the impressions of the polished stainless steel platform. The data were analyzed using ANOVA and Tukey’s test (α=1%). Results: There was no statistically significant difference in linear dimensions or surface roughness when the different disinfection treatments were compared (Groups 1, 2 and 3), for all types of gypsum. Conclusion: The disinfection treatments with sodium hypochlorite steam and distilled water steam for irreversible hydrocolloid impressions did not significantly affect the dimensional stability and surface roughness of the types III and IV gypsum dental models.

Author Biographies

Carmem Dolores Vilarinho Soares de Moura
Departamento de Odontologia Restauradora
Walter Leal de Moura
Department of Surgery, Faculty of Dentistry, Federal University of Piauí, Teresina, PI, Brazil
Fabiana Mantovani Gomes França
Graduate Program in Dentistry, São Leopoldo Mandic School of Dentistry, Campinas, SP, Brazil
Gregório Antônio Soares Martins
Dental School, Federal University of Piauí, Teresina, PI, Brazil
Lorenna Bastos Lima Verde Nogueira
Dental School, Federal University of Piauí, Teresina, PI, Brazil
Raquel Vírginia Zanetti
e São Leopoldo Mandic School of Dentistry, Campinas, SP, Brazil
Published
2010-06-22
Section
Original Article