Effect of Various Disinfectant Solutions on Colour Stability of Acrylic Resin Denture Base Materials” an Vitro Study

Purpose: To evaluate the change in colour of two commercially available denture base resins after subjecting them into three commonly used disinfectant solutions at different time interval.

Materials and Methods: A precise stainless steel die measuring 50mm in diameter and 1 mm in thickness (ADA No. 12)29 was customized and Duplication of the diameter and the thickness of die were achieved by using polyvinyl siloxane impression material after putting it into the die space to prepare testing samples. These polyvinyl siloxane putty samples were then invested to make mold for fabrication of the resin samples. 60 specimens were made using heat cure resins (DPI&TREVALON). 10 additional specimens from each resin specimens were also made as control group. After finishing and polishing, all sample of resin was subjected to colour measurement using computer controlled CM-3310 d Spectrophotometer (MINOLTA), before immersion and after immersion into the three disinfecting solutions at different time intervals.

Results: Both the denture base resins materials DPI and TREVALON have shown significant colour change with all the three disinfectants 0.5% Chlorhexidine (A), 2% Gluteraldehyde (B) and 0.5% Sodium Hypochloride (C) at difference in different time intervals.

DPI & TREVALON has shown significant amount of colour change with 2% Gluteraldehyde (B) disinfectant as compare to 0.5% Sodium Hypochloride (C) and 0.5% Chlorhexidine (A), DPI has shown least amount of colour change with 0.5% Sodium Hypochloride (C) which is not significant and TREVALON has shown least amount of colour change with 0.5% Chlorhexidine (A).

Conclusion: When DPI & TREVALON denture base resins were compared, TREVALON exhibited more colour change than DPI denture base resins regardless of any disinfectant used. Among all the three disinfectants, 2% Gluteraldehyde (B) has shown more colour changes than any other disinfectants, regardless of any denture base material used.