Akademik Veri Yönetim Sistemi
XI. CERAMIC CONGRESS WITH INTERNATIONAL PARTICIPATION, Afyonkarahisar, Türkiye, 21 - 23 Kasım 2022, ss.105, (Özet Bildiri)
Today, the increasing need for dental composites has led to an increase in the studies on the development of inorganic filler structures used in these composites. Various fillers are used to improve the mechanical properties of the composite. However, these structures cannot be loaded into the organic matrix in sufficiently high amounts. Therefore, the properties of composites are insufficient. Cellulose nanocrystal (CNC) which is used as an inorganic filler in industrial composites due to its mechanical properties, also has a great advantage for dental composites. In this study, dental composite fillings were obtained by mixing CNC with silica at different ratios to determine the optimum composition. The hydroxyl surface of CNC limits its use in non-polar matrices. Surface modification of CNCs with 3-(Trimethoxysilyl)propylmethacrylate [H2C=C(CH3)CO2(CH2)3Si(OCH3)3] and stearic acid [CH3(CH2)16COOH] was carried out to obtain a homogeneous distribution in the organic matrix. Mechanical tests were carried out in accordance with ISO 4049:2019 and DIN 50133 standards to examine the effect of CNC addition. All of the composites provided the curing depth value of >1.5 mm specified by the standard. The composite with no CNC addition yielded with 29.23 MPa compression strength and 44.7 HV hardness, on the other the results of MPS silanized CNC added composite were found 37.08 MPa and 44.7 HV for compression strength and hardness, respectively. The flexural strength value was increased from 42.31 MPa to 66.80 MPa, providing a minimum flexural strength value of 50 MPa expected from Type 2 dental composites within the scope of the standard.
Keywords: Silica, nanocrystalline cellulose, dental composite, flexural strength, hardness