The effects of disinfectants on dimensional accuracy and surface quality of impression materials and gypsum casts

Wala M Amin, Muna H Al-Ali, Sandra K Al Tarawneh, Sahar Th Taha, Mohamed W Saleh, Nadia Ereifij, Wala M Amin, Muna H Al-Ali, Sandra K Al Tarawneh, Sahar Th Taha, Mohamed W Saleh, Nadia Ereifij

Abstract

Background: The study aimed to evaluating the effect of disinfecting impression materials on the dimensional accuracy and surface quality of the resulting casts.

Methods: Impressions of a steel die constructed according to ANSI/ADA specification No.18 were made with each of alginate, addition cured silicone, condensation cured silicone and zinc oxide eugenol paste, and disinfected consequently by each of 0.2% chlorhexidine gluconate, 1% sodium hypochlorite, 2% gluteraldehyde for 5 minutes, and 0.5% sodium hypochlorite for 10 minutes. Dimensions of the disinfected impressions and their resultant casts were measured using a computerized digital caliper, and the dimensional changes were calculated. Reproduction of detail and surface quality of the resultant casts were assessed by grading casts surfaces according to a specific scoring system.

Results: The 0.5% sodium hypochlorite was found to produce the least dimensional changes in all the impression materials. Corsodyl produced the maximum changes in both alginate and zinc-oxide eugenol while addition-cured silicon was most affected by Gluteraldehyde and condensation-cured silicon was most affected by Hexana. The dimensional changes, however, were minimal and clinically insignificant. Addition-cured silicon showed the best surface quality and dimensional stability followed by condensation-cured silicon. Alginate and zinc-oxide eugenol had poorer surface quality and were affected to a higher extent by the disinfection procedures.

Conclusions: The results were comparable with the standard specifications for dimensional stability. Recommendations were made for the use of 10 minutes immersion in 0.5% sodium hypochlorite as the most appropriate disinfection protocol to the investigated impression materials.

Keywords: Disinfectants; Gypsum casts; Impressions; Alginate; Addition-cured silicone; Sodium hypochlorite.

Figures

Figure 1
Figure 1
The parts "1, 2, 3" of the assembly constructed according to the ADA specification number 18 for testing dimensional stability and reproduction of details of impression materials. The diagram "4" representing the surface of the die showing the three vertical lines.
Figure 2
Figure 2
Dimensional changes for casts made from alginate impression material after disinfection.
Figure 3
Figure 3
Dimensional changes for casts made from addition silicone impression material after disinfection.
Figure 4
Figure 4
Dimensional changes for casts made from condensation silicone impression material after disinfection.
Figure 5
Figure 5
Dimensional changes for casts made from Zinc Oxide Eugenol impression materials after disinfection.
Figure 6
Figure 6
The distribution of impression materials according to their surface quality grades scored after disinfection.
Figure 7
Figure 7
Surface quality and detail reproduction (X10 magnification): 1- sharp detail, continuous line; 2- continuous lines but with some loss of sharpness; 3- rough appearance with loss of continuity of the line.

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