Resumo

MOURA, Carmem Dolores Vilarinho Soares de et al. Dimensional accuracy of irreversible hydrocolloid impressions manipulated with chlorhexidine solution. RFO UPF [online]. 2013, vol.18, n.2, pp. 165-169. ISSN 1413-4012.

Objective: to assess the dimensional accuracy of plaster casts obtained from irreversible hydrocolloid impressions containing anti-microbial agent, which was mixed with either water or 0.2% chlorhexidine digluconate aqueous solution. Materials and method: the linear dimensions were measured with irreversible hydrocolloid impressions of a stainless steel master cast simulating cavity preparations for a fixed prosthesis with two abutments separated by a prosthetic space. From these molds, twenty plaster casts were made and assigned to the following groups: control - plaster casts obtained from irreversible hydrocolloid impressions made with powder containing chlorhexidine, and manipulated with distilled water (n = 10); experimental - plaster casts obtained from irreversible hydrocolloid impressions made with powder containing chlorhexidine, and manipulated with chlorhexidine solution instead of water (n = 10). The distances between the abutments and their diameters were measured with a digital caliper and data were submitted to the Student's t test. Result: there were no statistically significant differences in the measurements of distances between the abutments and their diameter in the experimental group when compared to the measurements of the control group (p > 0.05). Conclusion: according to the results of this study and considering its limitations, the dimensional differences between plaster casts obtained from irreversible hydrocolloid impressions manipulated with either water or 0.2% chlorhexidine digluconate were not statistically different.

Palavras-chave : Chlorhexidine.; Dental impression materials.; Prosthodontics..