The dimensional stability of an impression material reflects its ability to maintain the accuracy of the impression over time. 2 However, alginate is affected by the reactions of syneresis and imbibition after removal from the mouth, as has been observed in several studies therefore, stone casts must be fabricated as soon as possible to avoid dimensional changes. The accuracy of an impression material is vital to the production of a well-fitting restoration and, thus, to its longevity. 1 Alginate is one of the most widely used dental impression materials due to its ease of mixing, the flexibility of the set impression, its accuracy when properly handled, and low cost. Based on dimensional stability alone it would be more appropriate to disinfect irreversible hydrocolloid impression material by spraying it with NaOCl solution rather than immersing it.Ī dental impression is a negative imprint of an oral structure used to produce a positive replica of the structure for use as a permanent record or in the production of a dental restoration or prosthesis. No significant dimensional changes of gypsum casts obtained from irreversible hydrocolloid impression material sprayed with NaOCl solution were observed, whereas significant change in dimensional accuracy occurred when the casts were immersed in NaOCl solution. The impressions were then poured with stone, and the dimensional accuracy was determined from the mean of six measurements taken between fixed points using a digital caliper. Impressions of master models were taken using irreversible hydrocolloid impression material, which was then treated with NaOCl 1% or 5.25% solution, either by spaying or immersion, for 5 minutes, or not treated to act as control. The compound disinfectant spray with trichioro hydroxyl diphenyl ether is an effective antiseptics for alginate impressions and plaster models.This study investigated the effect of 1% and 5.25% of sodium hypochlorite (NaOCl) as spray and immersion solutions on the dimensional accuracy of an irreversible hydrocolloid impression material. The disinfectant spray with tame concentration was more effective on the alginate impression than on the plaster model in the same time (P = 0.000). The compound disinfectant spray with 3000 mg x L(-1) triebloro hydroxyl diphenyl ether was effective to all tested pathogens for 10 mm whatever on the impressions or the plaster models. The colonies were counted after sampling, inoculate and culture, which were used to deduce the killing logarithm value as the standard of the disinfecting efficiency. The disinfection efficiency of a compound disinfectant spray with trichioro hydroxyl diphenyl ether on dental impression and plaster model, which have been contaminated by pathogens, were evaluated in this study.Īs experimental group, germ-free alginate impressions and plaster models were sprayed with the compound disinfectant of different density trichloro hydroxyl diphenyl ether or indophors for 5, 10 and is mm, after which were smeared with five tested pathogens, including Staphylococcus acre us, Escherichia cali, Saccharomyces albicans, Streptococcus mutans and black spore variants of Bacillus subtilis.
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