Effect of short-term water storage on the elastic properties of some dental restorative materials--A resonant ultrasound spectroscopy study.
Dent Mater
; 23(7): 878-84, 2007 Jul.
Article
en En
| MEDLINE
| ID: mdl-16949660
OBJECTIVES: This study was aimed to determine if short-term water storage would change elastic properties of dental composite materials. METHODS: Particulate filler composite resin and continuous unidirectional E-glass FRC materials were photopolymerized and additionally post-polymerized by heat for testing elastic properties with the Resonance Ultrasound Spectroscopy method as a function of time in water storage. The test specimens were stored in 37 degrees C water for up to 30 days. RESULTS: About 1% weight increase due to water sorption was observed in both materials with both polymerization methods. Water sorption did not change the resonance frequencies towards lower values, indicating no significant decrease in elastic properties in these materials. Because of high damping of the polymer composite materials leading to wide resonance peaks and low number of the recorded peaks, accurate determination of the elastic properties was not possible. SIGNIFICANCE: Results suggest that the most likely explanation for the previously observed decrease in bending stiffness of FRC materials is the decreased yield limit of the hydrated polymer matrix. It is important to recognize that water sorption has the effect on mechanical properties of dental composite materials by changing the yield limit of the matrix rather than by changing the elastic properties of the material.
Buscar en Google
Colección:
01-internacional
Base de datos:
MEDLINE
Asunto principal:
Resinas Compuestas
Tipo de estudio:
Diagnostic_studies
Idioma:
En
Revista:
Dent Mater
Asunto de la revista:
ODONTOLOGIA
Año:
2007
Tipo del documento:
Article
País de afiliación:
Finlandia
Pais de publicación:
Reino Unido