Title
Dynamic elastic modulus of packable composites Dynamic elastic modulus of packable composites
Author
Faculty/Department
Faculty of Medicine and Health Sciences
Publication type
article
Publication
Copenhagen ,
Subject
Physics
Human medicine
Source (journal)
Dental materials. - Copenhagen
Volume/pages
17(2001) :6 , p. 520-525
ISSN
0109-5641
ISI
000171634800008
Carrier
E
Target language
English (eng)
Full text (Publishers DOI)
Affiliation
University of Antwerp
Abstract
Objective: A new type of so-called packable, condensable or mouldable composite has been developed and aims at replacing amalgam for posterior restorations. The purpose of the present investigation was to study the dynamic elastic modulus of 12 packable composites, and to follow the evolution of this property following prolonged water absorption. Methods: Of each material ten rectangular samples (1.5×5×35 mm) were prepared. The elastic modulus (GPa) of each sample was determined with a non-destructive dynamic method using a Grindo-Sonic after 24 h of dry storage at room temperature, and after 24 h, 1, 3 and 6 months of wet storage at 37°C. All data were analyzed using two-way ANOVA, Bonferroni/Dunn's test for multiple comparisons and paired t-test with a significance level of p<0.05. In addition, inorganic filler volume percentages were derived from the phenomenological model introduced by Braem et al. [11]. Results: The studied materials varied widely in terms of elastic modulus, ranging between composites classified as Compact-Filled Densified (elastic modulus of 23.4±2.4 GPa) and as Microfine (elastic modulus of 8.5±2.1 GPa). Significance: The great diversity observed in the elastic modulus of this type of composites necessitates clear specifications with regard to first the definition of marketing terms such as packable and so on, and second the justified use in posterior teeth.
E-info
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