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Low-shrinkage dental restorative composite: modeling viscoelastic behavior during setting
Bibi S Dauvillier1, Albert J Feilzer
1Department of Inorganic Chemistry and Catalysis, Debije Institute, Utrecht University, Sorbonnelaan 16, NL-3584 CA Utrecht, The Netherlands. b.s.dauvillier@chem.uu.nl
Summary
A new oxirane dental composite shows promise for reduced shrinkage stress during setting. Further evaluation is needed to confirm its suitability for dental restorative applications.
Area of Science:
- Dental Materials Science
- Polymer Chemistry
- Biomaterials Engineering
Background:
- Dental direct restorative composites aim to minimize shrinkage stress during setting.
- Developing novel low-shrinkage composites is crucial for improved clinical performance and longevity.
Purpose of the Study:
- To investigate the viscoelastic behavior of a new oxirane-based dental composite during setting.
- To analyze the mechanical properties and shrinkage characteristics of the experimental composite.
Main Methods:
- Dynamic mechanical analysis using sinusoidal strain cycles on a light-activated composite.
- Analysis of stress-strain data using two-parametric mechanical models.
- Validation of material parameters and model predictive capacity.
Main Results:
- The oxirane composite demonstrated a shrinkage delay and lower polymerization shrinkage strain and stress compared to conventional composites.
- The Maxwell model's predictive ability was limited to elastic modulus development due to noise in stress data.
Conclusions:
- The experimental oxirane composite exhibits favorable low-shrinkage properties.
- Further biocompatibility and mechanical property assessments are necessary to determine its clinical viability as a dental restorative material.