Polymer vs. Silicone Denture Liners: Tensile Strength with TiO2 and Thermocycling

Document Type : Original Article

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Removable Prosthodontics, Faculty of Dentistry, Assiut University, Assiut, Egypt

Abstract

 Aim : This study evaluated the tensile strength of polymer-based and silicone-based 
soft denture liners, with and without 2% titanium dioxide (TiO₂) nanoparticles, under 
thermocycling conditions. Subjects and methods: Specimens were fabricated using 
heat-cured acrylic resin discs coated with soft liners and subjected to thermocycling 
(3000 cycles, 5°C–55°C). Tensile strength was assessed using an Instron testing machine. 
Results: they showed that polymer-based liners had significantly higher tensile strength 
than silicone-based liners (p < 0.001). Thermocycling minimally affected polymer
based liners but reduced the strength of silicone-based liners. The addition of TiO₂ 
nanoparticles did not significantly alter the tensile strength of either material (p > 0.05). 
Conclusions: Polymer-based liners demonstrated superior mechanical performance, 
indicating their potential for clinical applications. Further research is needed to optimize 
nanoparticle incorporation and evaluate long-term clinical outcomes.

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