Booth Id:
MATS044T
Category:
Materials Science
Year:
2024
Finalist Names:
Bingcang, Frances Gabrielle (School: Angeles City Science High School)
Ong, Hart Gabrielle (School: Angeles City Science High School)
Yabut, Jessica Loreen (School: Angeles City Science High School)
Abstract:
In 2019, 455 million global occurrences of acute or chronic bone fracture symptoms and 178 million fractures were recorded. In the Philippines, hip fractures are projected to escalate to 175,000 by 2050. Bioglasses (BGs) are bioceramics utilized for synthetic bone substitutes. Bamboo (Bambusa blumeana) leaves and green mussel (Perna viridis) shells were utilized as sources of SiO₂ and CaO respectively. Sol-gel creates ceramics at low temperatures, which was used to develop a bioglass with a composition of 50% SiO₂- 25% CaO- 25% Na₂O. Experimental bioglasses were fired at 700 °C (EBG-700) and sintered at 900 °C (EBG-900) with a polydopamine-silver coating compared for 2-hour (EBG-700Ag2 and EBG-900Ag2) and 24-hour (EBG-700Ag24 and EBG-900Ag24) soaking periods. Ag-doped 58S bioglass samples were utilized as the control group. X-ray fluorescence spectroscopy revealed 98% purity of CaO from green mussel shells and SiO₂ from bamboo leaf ash. X-ray diffraction analysis revealed the presence of sodium calcium metasilicate in uncoated samples, with silver (Ag) confirmed in coated samples. Scanning electron microscopy (SEM) revealed the amorphous nature of EBG-700 and the crystalline structure of EBG-900 (both coated and uncoated), while Fourier transform spectroscopy (FTIR) revealed present functional groups. The growth of hydroxyapatite on bioglass surfaces after 7, 14, and 21-day immersions in a phosphate buffer solution was confirmed through SEM and Energy-dispersive X-ray spectroscopy (EDS). MTT assay results exceeded standard cell viability of >80%, with EBG-700Ag24 having cell viability of >500%. Therefore, the developed Ag-coated SiO₂-CaO-Na₂O bioglass is a highly cytocompatible, bioactive, and economical bone regenerative material.