12/9/2023 0 Comments Alginate impression disinfection![]() Therefore, the dimensional changes in the alginate impression material must be limited to an allowable range of up to only 0.15%. 4-6 Maintaining dimensional stability of dental impression materials is critical if the impression cannot be cast (in stone) soon after removal from the mouth. 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 short action time of Aseptrol may make it ideal for the disinfection of alginate impressions, and it may also find many uses for disinfection and possible sterilisation.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. This immersion time is less likely to affect the dimensional properties of the impression material. Within the limits of this study it was found that both compounds effectively disinfected the alginate in the presence of organic material, but that Aseptrol did so after an immersion time of only 1.5 minutes. It was effective against vegetative organisms for >37 days for a 30-second exposure. Presept significantly reduced (99.99%) C. It was effective against vegetative organisms for up to 27 days for a 30-second exposure. There was a consistent significant reduction (99.99%) in all tests of vegetative organisms after immersion in the Aseptrol for 30 seconds, and for spores after 1.5 minutes. The anti-microbial efficacy of the solution was tested for 37 days. The blocks were then placed in sterile 0.5% sodium thiosulphate neutralizer and surviving organisms were harvested and counted using the serial dilution technique followed by culturing on appropriate media. ![]() Immersion times were 30 seconds, 1, 1.5, 2, 3 and 5 minutes. The blocks were placed either in sterile distilled water as control, or in 48-ppm Aseptrol or Presept solution containing organic matter. To evaluate the antimicrobial efficacy of a chlorite disinfectant (Presept) and a new formulation chlorine dioxide based disinfectant (Aseptrol) on irreversible hydrocolloid (alginate) impression material.Īlginate blocks were contaminated with Candida albicans, Staphylococcus aureus, Pseudomonas aeruginosa, Streptococcus mutans and Bacillus subtilis spores. Irreversible hydrocolloid (alginate) impressions are dimensionally unstable and difficult to disinfect.
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