Glass transition temperature of hard chairside reline materials after post-polymerisation treatments

• Published in: Gerodontology Vol. 27; no. 3; pp. 230 - 235
• Main Authors: Urban, Vanessa M., Machado, Ana L., Alves, Marinês O., Maciel, Adeilton P., Vergani, Carlos E., Leite, Edson R.
• Format: Journal Article
• Language: English
• Published: Oxford, UK Blackwell Publishing Ltd 01-09-2010
• Subjects: acrylic resin; Acrylic Resins - chemistry; Acrylic Resins - radiation effects; Calorimetry, Differential Scanning; Dental Materials - chemistry; Dental Materials - radiation effects; Dentistry; Denture Liners; Denture Rebasing; differential scanning calorimetry; Glass - chemistry; Glass - radiation effects; glass transition temperature; Hot Temperature; Humans; Materials Testing; Methacrylates - chemistry; Methacrylates - radiation effects; Microwaves; Polymerization; post-polymerisation treatment; Silicone Elastomers - chemistry; Silicone Elastomers - radiation effects; Time Factors; Transition Temperature; Water - chemistry
• ISSN: 0734-0664; 1741-2358
• DOI: 10.1111/j.1741-2358.2009.00312.x

doi:10.1111/j.1741‐2358.2009.00312.x

Glass transition temperature of hard chairside reline materials after post‐polymerisation treatments
Objective:  This study evaluated the effect of post‐polymerisation treatments on the glass transition temperature (Tg) of five hard chairside reline materials (Duraliner II‐D, Kooliner‐K, New Truliner‐N, Ufi Gel hard‐U and Tokuso Rebase Fast‐T).
Materials and methods:  Specimens (10 × 10 × 1 mm) were made following the manufacturers’ instructions and divided into three groups (n = 5). Control group specimens were left untreated. Specimens from the microwave group were irradiated with pre‐determined power/time combinations, and specimens from the water‐bath group were immersed in hot water at 55°C for 10 min. Glass transition (°C) was performed by differential scanning calorimetry. Data were analysed using anova, followed by post hoc Tukey’s test (α = 0.05).
Results:  Both post‐polymerisation treatments promoted a significant (p < 0.05) increase in the Tg of reline material K. Materials K, D and N showed the lowest Tg (p < 0.05). No significant difference between T and U specimens was observed.
Conclusion:  Post‐polymerisation treatments improved the glass transition of material Kooliner, with the effect being more pronounced for microwave irradiation.