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Published on: January 29, 2020
Effects of thermocycling on mechanical properties of soft lining materials
Marcelo Coelho Goiato1, Bruna Carolina Rossatti Zucolotti, Daniela Micheline dos Santos
1Department of Dentistry Materials and Prosthesis, Faculty of Dentistry of Araçatuba, University of the State of São Paulo, Brazil. goiato@foa.unesp.br
Unlabelled:
Soft linings are materials used to reduce the tension and forces of mastication, forming all or part of the fitting surface of a denture. This study evaluated the effect of thermocycling on water absorption, solubility, Shore A hardness and color stability of permanent soft liner materials.
Material And Methods:
Two chemically activated soft liner materials (Sofreliner S; GC Reline Ultrasoft) were tested. Twenty cylindrical specimens (30.0 x 1.0 mm) were prepared for measuring water absorption and solubility and another twenty (30.0 x 3 mm) for analyzing Shore A hardness and color stability. Color was measured by a spectrophotometer before and after 2000 thermocycles. A one-way ANOVA test and Tukey test at a 5% confidence level (p<0.05) were performed.
Results:
The results did not show statistical differences for water absorption, solubility or color stability. The post-thermocycling Shore A hardness values were significantly higher than those before the treatment.
Conclusion:
Thermocycling of soft liner materials increased Shore A hardness.
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