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Dynamic elastic modulus of 'packable' composites.

Y Abe1, P Lambrechts, S Inoue

  • 1BIOMAT-Department of Operative Dentistry and Dental Materials, School of Dentistry, Oral Pathology and Maxillo-Facial Surgery, Catholic University of Leuven, B-3000, Leuven, Belgium.

Dental Materials : Official Publication of the Academy of Dental Materials
|September 25, 2001
PubMed
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This study evaluated the dynamic elastic modulus of 12 packable dental composites, finding significant variations. These findings highlight the need for clear definitions of composite properties for posterior restorations.

Area of Science:

  • Dental Materials Science
  • Biomaterials Engineering

Background:

  • Packable, condensable, and mouldable composites are emerging as alternatives to amalgam for posterior dental restorations.
  • Understanding their mechanical properties, such as dynamic elastic modulus, is crucial for clinical application.

Purpose of the Study:

  • To investigate the dynamic elastic modulus of 12 different packable composite materials.
  • To assess the changes in elastic modulus after prolonged water absorption.

Main Methods:

  • Ten rectangular samples of each composite were tested using a non-destructive dynamic method (Grindo-Sonic).
  • Elastic modulus was measured after initial dry storage and subsequently after 24 hours, 1, 3, and 6 months of wet storage at 37°C.
  • Statistical analysis included two-way ANOVA, Bonferroni/Dunn's test, and paired t-tests (p<0.05).

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Main Results:

  • A wide range of dynamic elastic moduli was observed among the 12 composites.
  • Values varied from 8.5±2.1 GPa for Microfine composites to 23.4±2.4 GPa for Compact-Filled Densified composites.
  • Prolonged water absorption did not appear to be a significant factor in the observed variations.

Conclusions:

  • Significant variability exists in the dynamic elastic modulus of packable composites.
  • Clearer definitions and specifications for marketing terms like 'packable' are needed.
  • Further research is required to justify the use of these composites in posterior teeth based on their mechanical properties.