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[Dimensional stabilities of microfilled composite resins (author's transl)]
Shika Rikogaku Zasshi. Journal of the Japan Society for Dental Apparatus and Materials
|April 1, 1981
Summary
Microfilled composite resins exhibit higher thermal expansion and water sorption than conventional ones, potentially impacting dental restoration marginal integrity. These properties are crucial for understanding material behavior and clinical performance in dentistry.
Area of Science:
- Materials Science
- Biomaterials Science
- Polymer Chemistry
Context:
- Dental restorations require materials with stable physical and chemical properties to ensure longevity and prevent secondary caries.
- Composite resins are widely used in dentistry, but their interaction with the oral environment, including thermal and moisture changes, can affect their performance.
- Microfilled composite resins offer aesthetic advantages but their dimensional stability under varying conditions needs thorough evaluation.
Purpose:
- To evaluate and compare the thermal expansion, water sorption, and solubility of microfilled composite resins against conventional composite resins.
- To investigate the influence of water sorption on the linear expansion of different composite resin types.
- To assess how filler content and matrix hydrophobicity affect the water sorption and solubility of microfilled composites.
Summary:
- Microfilled composite resins demonstrated significantly higher coefficients of linear thermal expansion (41–93 x 10⁻⁶/°C) compared to conventional resins (2–3 times higher) and tooth structure (6–8 times higher).
- Linear expansion due to water sorption was strongly correlated with water sorption itself, with microfilled resins showing greater expansion than conventional ones.
- Generally, microfilled composites exhibited higher water sorption (0.4–1.9 mg/cm²) and solubility than conventional resins, though variations were noted based on filler load and matrix hydrophobicity.
Impact:
- The increased thermal expansion and water sorption of microfilled composites may compromise the marginal integrity of dental restorations, potentially leading to leakage and failure.
- Understanding these material properties is essential for selecting appropriate dental composites and predicting their clinical behavior and longevity.
- Further research into modifying microfilled composite formulations could improve their dimensional stability and clinical performance.