Effects of thermocycling on mechanical properties of soft lining materials.

• Autor(a) principal: Goiato, Marcelo Coelho [UNESP]
• Data de Publicação: 2009
• Outros Autores: Zucolotti, Bruna Carolina Rossatti, Santos, Daniela Micheline dos [UNESP], Moreno, Amália, Rezende, Maria Cristina Rosifini Alves [UNESP]
• Tipo de documento: Artigo
• Idioma: eng
• Título da fonte: Repositório Institucional da UNESP
• Texto Completo: http://www.actaodontologicalat.com/archivo/v22n3/fulltext/articulo11.pdf; http://hdl.handle.net/11449/71419
• topic: denture; materials testing; mechanics; temperature; Denture Liners; Materials Testing; Mechanics; Temperature

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.