Effect of Various Disinfection Methods on Water Sorption and Solubility of Heat- Cure Acrylic Resin with and without Resilient Liner (In-vitro Study)

Abstract

Background: Resilient denture liners are beneficial to edentulous patients with severely resorbed ridges. Although disinfection of relined and non-relined acrylic resin dentures was highly recommended for advancing oral health status, these techniques may affect denture materials’ physical criteria. Objective: To evaluate the impact of various disinfection methods on the water sorption and solubility of relined and non-relined heat-cure acrylic resin dentures. Material and Methods: 60 heat-cure samples were constructed, then randomly sectioned to two main groups; Group I (heat-cure acrylic resin) and Group II (relined heat-cure acrylic resin). Either group was sectioned to three equal subgroups (1 Control (Distilled water) and 2 disinfection groups; Sodium hypochlorite (NaOCl) and
Chlorhexidine mouthwash). All specimen were daily disinfected for 30 days, washed with tap water then stored in distilled water at 37oC. Water sorption and solubility’s degree were calibrated by the electronic balance and calculated with a specific formula. Data were collected, tabulated, and statistically analyzed. Results: Water sorption between Group I and different solutions showed
significant difference; the lowest significantly in Control, while NaOCl and Chlorhexidine had insignificant difference. In Group II, water sorption significantly was the lowest in Control and the highest in Chlorhexidine, while NaOCl had insignificant differences with other solutions. Regarding water solubility relined and non-relined samples demonstrated insignificant differences between them as P=0.85, 0.68, and 0.13 regarding Control, NaOCl, and Chlorhexidine respectively. Conclusion: Plain acrylic resin samples demonstrated the lowest water sorption in Control, while displayed was an insignificant difference after immersion in NaOCl and Chlorhexidine. Concerning water solubility, an insignificant difference was apparent between the plain and relined samples in all immersions
employed.