Machanical performance of encapsulated restorative glass ionomer cements for use with atraumatic restorative treatment (ART)
Date
2013Author
Cabral, Ricardo
Molina, Gustavo Fabián
Mazzola, Ignacio
Brain Lascano, Laura C.
Frencken, Jo E.
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The Atraumatic Restorative Treatment (ART) approach was suggested to be a suitable method to treat enamel and dentine carious lesions in patients with disabilities. The use of a restorative glass-ionomer with optimal mechanical properties is, therefore, very important. Objective: To test the null-hypotheses that no difference in diametral tensile, compressive and flexural strengths exits between: (1) The EQUIA system and (2) The Chemfil Rock (encapsulated glass-ionomers; control materials); (3) ) The EQUIA system and Chemfil Rock. Materials and Methods: Specimens for testing flexural (n=240) and diametral tensile (n=80) strengths prepared according to standardized specifications; the compressive strength (n=80) was measured using a tooth-model of a class II ART restoration. ANOVA and Tukey B tests were used to test for significant differences between dependent and independent variables. Results: The EQUIA system and Chemfil Rock had significantly higher mean scores for all the three strength variables than the Fuji 9 Gold Label and Ketac Molar Easymix (α=0.05). The EQUIA system had significant higher mean scores for diametral tensile and flexural strengths than the Chemfil Rock(α=0.05). Conclusion: The two encapsuled hight-viscosity glass-ionomers had significantly higher test values for diametral tensile, flexural and compressive strengths than the commonly used hand-mixed high-viscosity glass-ionomers.