Abstract
Dental composite materials (CM) are widely
used in dentistry for restorations. The aim of this study was to determine how compressive properties of commercially available dental CM change in simulated intraoral conditions. The investigated material was 3M ESPE Filtek™ Ultimate A2 Enamel Shade that is widely used in dental clinic and preclinical studies for anterior
and posterior restorations. First, the compressive properties of dental composite were determined in uncondensed state. The compressive modulus, strength and maximal deformation were evaluated from the stressstrain curves obtained for the prismatic CM specimens. The specimens were immersed in distilled water (pH = 6), water and vinegar solution (pH = 4), and alkaline mineral water (pH = 8) at 50 C until equilibrium moisture content. Then, the mechanical testing in
compression was repeated. It was experimentally confirmed that the storage in simulated intraoral conditions caused a significant reduction of compressive properties of the dental CM, which can negatively influence the lifespan of the restoration. The strength and
compressive modulus of the moistened samples were reduced by 27% and 25%, accordingly, but the maximal deformation was increased by 0.4% in comparison with the unconditioned samples. The CM stored in solution with pH = 8 had the highest elastic modulus and strength and the lowest maximal deformation in comparison with
the CM stored in more acidic solutions (pH is 4 and 6), indicating to lower inner degradation phenomena of the dental CM.
used in dentistry for restorations. The aim of this study was to determine how compressive properties of commercially available dental CM change in simulated intraoral conditions. The investigated material was 3M ESPE Filtek™ Ultimate A2 Enamel Shade that is widely used in dental clinic and preclinical studies for anterior
and posterior restorations. First, the compressive properties of dental composite were determined in uncondensed state. The compressive modulus, strength and maximal deformation were evaluated from the stressstrain curves obtained for the prismatic CM specimens. The specimens were immersed in distilled water (pH = 6), water and vinegar solution (pH = 4), and alkaline mineral water (pH = 8) at 50 C until equilibrium moisture content. Then, the mechanical testing in
compression was repeated. It was experimentally confirmed that the storage in simulated intraoral conditions caused a significant reduction of compressive properties of the dental CM, which can negatively influence the lifespan of the restoration. The strength and
compressive modulus of the moistened samples were reduced by 27% and 25%, accordingly, but the maximal deformation was increased by 0.4% in comparison with the unconditioned samples. The CM stored in solution with pH = 8 had the highest elastic modulus and strength and the lowest maximal deformation in comparison with
the CM stored in more acidic solutions (pH is 4 and 6), indicating to lower inner degradation phenomena of the dental CM.
| Original language | English |
|---|---|
| Title of host publication | Medical Physics in the Baltic States |
| Subtitle of host publication | Proceedings of the 14 th International Conference on Medical Physic |
| Editors | Diana Adlienė |
| Place of Publication | Kaunas |
| Publisher | Kaunas University of Technology |
| Pages | 105-108 |
| Publication status | Published - 2019 |
| Event | 14th International Conference on Medical Physics - Kaunas, Lithuania Duration: 7 Nov 2019 → 9 Nov 2019 Conference number: 14 |
Publication series
| Name | MEDICAL PHYSICS IN THE BALTIC STATES |
|---|---|
| ISSN (Print) | 1822-5721 |
Conference
| Conference | 14th International Conference on Medical Physics |
|---|---|
| Country/Territory | Lithuania |
| City | Kaunas |
| Period | 7/11/19 → 9/11/19 |
Keywords*
- dental composite
- compressive properties
- environmental ageing
- moisture and temperature effects
- pH factor
Field of Science*
- 3.2 Clinical medicine
- 2.5 Materials engineering
Publication Type*
- 3.1. Articles or chapters in proceedings/scientific books indexed in Web of Science and/or Scopus database