Changes in surface roughness and colour stability of soft denture lining materials caused by denture cleansers

Abstract

Soft denture lining materials were immersed into solutions of denture cleansers for 8 h at room temperature, and immersed into distilled water for the remainder of the 24-h period at 37 degrees C. Surface roughness of the soft denture lining materials was measured by contact type surface roughness instrument. For the colour stability test, soft denture lining materials were immersed in the denture cleansers as described above for 180 days. Finally, the colour changes of each material were quantitatively measured by a photometrical instrument to obtain the colour differences between newly processed specimen and immersed specimens (P < 0.01). An autopolymerizing silicone material, Evatouch, exhibited severe changes in surface roughness by all denture cleanser, and the generic material GC Denture Relining showed the minimal changes. Severe colour changes were also observed with some liner and cleanser combinations (P < 0.01). Except for Evatouth, the four silicone soft liners were more stable in surface roughness and in colour change than the two acrylic soft liners. One autopolymerizing silicone (GC denture relining) and one heat curing silicone (Molloplast B) demonstrated the best stability.

Comparative effects of denture cleansers on physical properties of polyamide and polymethyl methacrylate base polymers

“…Resins are cleaned with alkaline peroxide by decomposition of peroxide into free radicals. These free radicals convert large molecules into small molecules through reduction and oxidation processes 29) .…”

Compatibility of tissue conditioners and denture cleansers: Influence on surface conditions

“…Previous studies investigated the influence of denture cleansers on the surface conditions and color stability of hard denture base resins 21,22) and long-term soft denture liners 23) . In addition, the influence of such cleansers on the surface conditions of tissue conditioners has been evaluated by examining surface porosity 16,18) .…”

Basic Study of a New Soft Resin Applied with Bisfunctional Siloxane Oligomer

“…For example, autopolymerizing silicone materials exhibited severe, and surface roughness changes caused by denture cleansers 11) . It should be cautioned that daily cleansing of soft lining materials with mismatched denture cleansers could promote subsequent biofilm formation of fungi on the materials 12) .…”