THE EFFECT OF WATER SORPTION ON THE MECHANICAL PROPERTIES OF DENTAL COMPOSITES

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Kiraz N.

II. INTERNATIONAL PERGE SCIENTIFIC STUDIES CONGRESS , Antalya, Türkiye, 11 - 12 Ocak 2025, ss.140, (Özet Bildiri)

  • Yayın Türü: Bildiri / Özet Bildiri
  • Basıldığı Şehir: Antalya
  • Basıldığı Ülke: Türkiye
  • Sayfa Sayıları: ss.140
  • Akdeniz Üniversitesi Adresli: Evet

Özet

Particle-filled polymeric composite materials have become indispensable in many technological fields, including dental treatments. In dental composites developed for this purpose, the organic matrix, which acts as a binder, is frequently prepared from monomers such as Diurethane dimethacrylate (UDMA), Bisphenol A glycidyl methacrylate (Bis-GMA), and Ethoxylated bisphenol A glycidyl methacrylate (Bis-EMA). Due to their high molecular weight, especially Bis-GMA and Bis-EMA monomers have high viscosity, which makes it difficult to prepare composite structures with the addition of ceramic particles. Therefore, acrylate-based solvents with cross-linking properties, such as Triethylene glycol dimethacrylate (TEGDMA), are used. In this study, the monomer mixtures of DUDMA:TEGDMA:Bis-GMA and DUDMA:TEGDMA:Bis-EMA were kept constant at a weight ratio of 60:40:20, respectively, as the organic matrix. Barium borosilicate with particle sizes of 3 μm and 0.7 μm was added as a ceramic particle at a weight ratio of 55% and 24%, respectively, to prepare the composite composition. Camphorquinone (CQ), a light-activated radical initiator, was used at 0.5% of the total composite weight for the polymerization reaction.

Bis-GMA and Bis-EMA are high molecular weight monomers frequently used interchangeably in the preparation of dental composites. Therefore, in this study, all other components of the composite were kept constant, while the organic matrix was varied between Bis-GMA and Bis-EMA to prepare test specimens. Water sorption and solubility values of the prepared specimens were determined according to ISO 4049, "Dentistry-Polymer based restorative materials". To evaluate the impact of water sorption on mechanical behavior, specimens were immersed in water for various durations (3, 6, 9, 12, and 15 days) and then subjected to flexural, compressive, and fracture toughness testing using a universal testing machine, following ISO 4049 protocols.

When the compressive test results of the specimens were examined, it was found that the compressive strength of the composites prepared with Bis-GMA increased by approximately 50 MPa after 15 days, while the compressive strength values of the composites prepared with Bis-EMA decreased by an average of 25 MPa. No significant change was observed in the flexural strength values of both types of composites after 15 days. When the fracture toughness values were examined, no significant change was observed in the composites prepared with Bis-GMA due to water interaction, while the fracture toughness value of the composite composition prepared with Bis-EMA increased from 0.80 MPa m1/2 to 1.20 MPa m1/2.