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Novel light-cured resins and composites with improved physicochemical properties
Sónia G Pereira1, Raquel Osorio, Manuel Toledano
1IST, Departamento de Engenharia de Materiais, Av. Rovisco Pais 1, 1049-001 Lisbon, Portugal. soniag.pereira@ist.utl.pt
Summary
New Bis-GMA analogues as diluents reduce hydrophilicity and water sorption in dental resins. CH(3) Bis-GMA shows promise, offering lower hydrolytic degradation and improved homogeneity of cure compared to TEGDMA.
Area of Science:
- Dental Materials Science
- Polymer Chemistry
- Biomaterials Engineering
Background:
- Bis-GMA (Bisphenol A glycidyl methacrylate) is a common resin matrix in dental composites.
- TEGDMA (Triethylene glycol dimethacrylate) is frequently used as a diluent, but can lead to water absorption and degradation.
- Novel Bis-GMA analogues are being investigated as potential replacements for TEGDMA to improve resin properties.
Purpose of the Study:
- To evaluate the impact of two new Bis-GMA analogues (CH(3) Bis-GMA and CF(3) Bis-GMA) as diluents.
- To assess their effect on physicochemical properties of Bis-GMA based resins and composites at various dilution levels and filler contents.
- To compare their performance against traditional TEGDMA-based controls.
Main Methods:
- Twenty resin/composite formulations were created using Bis-GMA/TEGDMA, Bis-GMA/CH(3) Bis-GMA, and Bis-GMA/CF(3) Bis-GMA mixtures.
- Formulations varied in dilution ratios (85/15, 10/90, 0/100) and filler loading (0%, 10%, 35% silanated barium aluminosilicate glass).
- Evaluated properties included viscosity, homogeneity of cure (HC), microhardness, depth of cure, oxygen inhibition effect (OIE), water contact angle, water sorption/solubility, and surface morphology via SEM.
Main Results:
- Materials with CH(3) Bis-GMA and CF(3) Bis-GMA demonstrated reduced hydrophilicity, water sorption, and solubility.
- Increased Bis-GMA dilution enhanced depth of cure and oxygen inhibition effect (OIE), especially with TEGDMA.
- Incorporation of fillers decreased OIE and increased material hydrophobicity.
Conclusions:
- CH(3) Bis-GMA is a promising diluent candidate, exhibiting lower hydrolytic degradation and improved homogeneity of cure compared to TEGDMA.
- The novel Bis-GMA analogues offer potential for developing dental resins with enhanced durability and reduced water interaction.
- Filler content plays a significant role in modulating resin properties like OIE and hydrophobicity.
