Saudi Cultural Missions Theses & Dissertations
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Item Restricted Development of novel fluoride-releasing composites(Newcastle University, 2024-03-18) Algadhi, Abdulaziz; Bretcanu, Oana; German, MatthewDue to the development of secondary caries, resin-based composites (RBCs) have short life spans. Several modifications have been studied to overcome this problem, such as incorporating ion-releasing fillers. In this study a previously lab-made fluoridated bioactive glass (F-BAG) was scaled-up industrially to establish whether scaling-up affected the fluoride release and flexural properties of RBCs containing this glass. Next, the effect of different monomers and F-BAG concentrations was assessed on selected physical and mechanical properties of RBCs. Materials and methods: One batch of the lab-made F-BAG and three nominally identical but separately made batches, made by a contract manufacturer (GTS, Glass Technology Services, UK), were initially assessed. First, RBCs made from 50:50 UDMA:TEGDMA and a barium aluminium-silicate glass as primary filler with 20wt% of the different F-BAG batches added. Additionally, an RBC was made with only the primary filler added and one in which the three GTS batches were mixed was made. Next the effect of different monomers (UDMA, HEMA, TEGDMA) was established on RBCs containing the same concentration of F-BAG. Finally, the effect of F-BAG concentration was established when the monomer concentrations were fixed. All RBCs were assessed in terms of degree of conversion (DOC), water sorption, fluoride release, flexural strength (FS) and flexural modulus (FM).28 0