Effect of storage time on tear strength of extended-pour irreversible hydrocolloid impression materials

OpenAlex Türkçe

Objective: The aim of this in vitro study was to evaluate the effect of prolonged storage times on the tear strength of extended-pour irreversible hydrocolloid impression materials. Material and Method: Eighty four specimens were fabricated from five commercial extended-pour irreversible hydrocolloid impression materials (BluePrint Xcreme, Hydrogum 5, Kromopan, Alginmax and Alginelle) as well as one experimental formula in accordance with the ISO 21563:2013 standard effective for irreversible hydrocolloid impression materials. Specimens were randomly divided in two groups for each impression material (n=7) and subjected to tear strength test immediately (base line) or after 120 hours of storage. Tear strength values were obtained in N/mm and data were analysed with two-way ANOVA (irreversible hydrocolloid brand, storage time). Multiple comparisons were performed with Tukey’s test (p=0.05). Results: The tear strength of the extended-pour irreversible hydrocolloid impression materials were affected by brand (p<0.0001) and brand-storage time interaction (p=0.005). Storage time did not influence the tear strengths of the extended-pour irreversible hydrocolloid impression materials tested except Alginmax whose mean tear strengths increased after 120 hours of storage (p<0.05). At base line measurements Blueprint Xcreme provided the highest mean tear strength values (1.08±0.19 N/mm) whereas Alginelle provided the lowest mean tear strength values (0.51±0.3 N/mm). Hydrogum 5 provided the highest tear strength values after 120 hours of storage (1.15± 0.12 N/mm) whereas Alginelle provided the lowest mean tear strength values (0.55±0.04 N/mm). Conclusion . All commercial extended-pour irreversible hydrocolloid impression materials tested maintained their tear strengths after 120 hours of storage.