Related Experiment Video
Updated: May 23, 2026
Impact of Fabrication Techniques and Polishing Procedures on Surface Roughness of Denture Base Resins
Published on: January 17, 2025
The effect of immersion cleansers on gloss, colour and sorption of acetal denture base material
Gregory Polyzois1, Artemis Niarchou, Polyxeni Ntala
1Department of Prosthodontics, Dental School, University of Athens, Athens, Greece. grepolyz@dent.uoa.gr
Objective:
To study the effect of peroxide and hypochlorite cleansers on gloss, colour and sorption of acetal denture resins.
Materials And Methods:
Pink acetal and thermoplastic acrylic resins were evaluated. Thirty-five specimens 39 × 39× 1.8 mm of each resin were prepared. Each group of specimens (n = 7) was then immersed into cleansers for 100 days. Group I immersed in tap water, Group II in Corega Extradent for 5 min, Group III in Corega Extradent for 8 h, Group IV in NitrAdine™ Seniors for 15 min and Group V in NaOCl 5.25%. Gloss, colour and weight measurements were taken initially and after 100 days. Data subjected to two-way anova and Tukey's test at α = 0.05.
Results:
Acrylic resin showed reductions of glossiness from -5 to -15 and acetal from -0.2 to -6. Colour changes (ΔΕ*) ranged from 2.64 to 7.64 for acrylic and 2.77 to 26.54 for acetal resin. Sorption for acrylic ranged from 11.64 to 17.06 μg/mm(3) and 9.18 to 24.79 μg/mm(3) for acetal resin. The results of (ΔΕ*) and sorption showed an interaction between denture resins and cleansers.
Conclusions:
The gloss of acetal resin was less affected by water, peroxides and NaOCl 5.25% compared with acrylic resin. Acetal resin showed clinically acceptable (ΔΕ*) whereas acrylic resin unacceptable ones for water and peroxide solutions. The immersion of acetal resin in NaOCl 5.25% showed clinically unacceptable (ΔΕ*) and higher sorption and should be avoided or should be managed with care.
