Akademik Veri Yönetim Sistemi
XI. Uluslarası katılımlı seramik kongresi, Afyonkarahisar, Türkiye, 21 - 23 Kasım 2022, ss.105, (Özet Bildiri)
Dental caries, which are seen in almost every individual in our society, have negative effects on the aesthetic appearance as well as affecting the general health. The diagnosis and treatment of these diseases, which are affected by many different factors such as age, gender, genetics, food style and oral hygiene, and have a great impact on the quality of life of individuals, are very important. Many restorative materials such as gold, amalgam, different kind of polymers and composites are used in the treatment of the lost tooth structure caused by the caries. Despite the poor aesthetic appearance, amalgam fillings were widely used in the past years due to their mechanical properties and ease of use. On the other hand, dental composite materials are become more preferable recently instead of amalgam fillings in accordance with the discussions about the safety of mercury-containing amalgam fillings and the demand for aforementioned aesthetic concerns. Stuides about the improving the properties of the dental composites started to attract more attention as the demand on such materials increases. Various inorganic fillers such as silica, zirconia or glass-ceramic are used to improve the mechanical and physical properties of the composite. The widely used inorganic fillers is silica because of its easy accessibility, relative inexpensiveness, and good mechanical and physical properties. However, the search for an inorganic filler to be used instead of or in combination with silica continues, since these structures cannot be loaded into the organic matrix in high enough amounts and cannot meet the desired mechanical performance considering the long-term mechanical stability of the restoration. Nanocrystalline Cellulose (NCC), which is used as an inorganic filler in industrial composites due to its high mechanical properties, non-toxicity and biocompatibility; has a great advantage to improve the mechanical properties of the dental composites. In the present thesis, NCC and methacrylate-based dental composites were produced to improve the mechanical properties of silica-containing composite fillings. The hydroxyl surface of NCC limits its use in non-polar organic matrices of dental composite. Therefore, it was modified with three different agents [(3-methacryloxy Propyl Trimethoxysilane (MPS), Stearic Acid (SA) and 3-methacryloxy Propyl Trimethoxysilane (APTES)] to obtain hydrophobic surfaces. The obtained NCCs were added to the organic matrix and dental composites were prepared. Properties of dental composites were evaluated according to ISO 4049 and DIN 50133 standards. The mechanical and physical tests applied to the prepared composites were examined by analysis of variance (Oneway-ANOVA) and it was determined that there was a statistically significant difference between the flexural strength values of MPS/NCC-3 additions and the other groups. It has been seen that MPS’s similar functional group led more effective interfacial bonding between the matrix and filler. It was also determined that the addition of MPS-NCC improved the mechanical and physical properties of the dental composite.