Gigi tiruan lepasan yang kotor dapat menjadi tempat melekatnya mikroorganisme. Jika tidak dilakukan pembersihan rutin, maka akan dapat menimbulkan penyakit seperti denture stomatitis yang disebabkan oleh jamur Candida albicans. Perasan murni bawang putih diketahui memiliki kandungan allicin yang dapat menghambat pertumbuhan Candida albicans. Hal tersebut membuat peneliti ingin mengetahui pengaruh lama perendaman bahan basis gigi tiruan akrilik dalam perasan murni bawang putih 50% terhadap jumlah koloni Candida albicans. Jenis penelitian ini merupakan penelitian laboratorium eksperimen dengan rancangan control group post test only. Kelompok sampel terdiri dari dua, kelompok perlakuan direndam dalam perasan murni bawang putih 50% dan kelompok kontrol direndam dalam aquades steril. Setiap kelompok dibagi berdasarkan lama waktu perendaman. Uji analisis yang digunakan ialah uji t test dan dilanjutkan dengan LSD. Hasil penelitian ini diperoleh rata-rata koloni Candida albicans setelah perendaman dalam

Background: Metal ceramic restoration (MCR) is a gold standard due to its ability to withstand masticatory forces and aesthetics. However, it frequently appears to experience a fracture in the oral cavity. The ceramics in MCR consist of an opaque dentin and enamel layer, which contain silica to give the ceramic strength. Silica is an abundant material, mainly synthesized from rice husks. The study was aimed to investigate the effect of silica added to commercially opaque porcelain powder in increasing the flexural strength of MCR. Methods: The research sample was rectangular Co-Cr metal [(25±1) mm × (3±0.1) mm × (0.5 ± 0.05) mm], and opaque porcelain powder and dentin [(8±0.1) mm× (3±0.1) mm ×(1.1±0.1) mm]. White silica powder was synthesized from rice husk by sonication for 270 minutes, characterized by x-ray fluorescence (XRF). Silica was mixed with commercial opaque porcelain powder with various concentrations of 0, 0.5, and 1%, porcelain coating procedure on the centre of the surface metal, followed by sintering at 9500C. Results: Characterization with XRF showed that the elemental content of pure silica was 83.9%. The average flexural strength value with three-point bending in each sample is 109.67±12.163; 131.26±3.817; and 108.35±4.26. The results of statistical tests using One Way ANOVA stated a significant increase in the flexural strength of MCR (p<0.05) post added the rice husk silica to the commercial opaque porcelain powder. Conclusion: Adding 0.5% silica resulted in the optimal flexural strength of MCR.

GTC keramik-logam adalah gigi tiruan cekat dengan bahan keramik-logam yang secara permanen disemenkan pada gigi geligi, dan sampai saat ini menjadi gold standard di Bidang Prostodontik, akan tetapi sering terjadi permasalahan pada GTC  keramik-logam antara lain fraktur adhesi dan fraktur kohesi. Penelitian ini bertujuan untuk mengetahui pengaruh ketebalan lapisan dentin terhadap kekuatan fleksural pada GTC keramik-logam. Metode penelitian yang digunakan adalah eksperimental laboratorium secara in vitro, dengan rancangan penelitian post  test only control group design. Jumlah sampel yang digunakan adalah sebanyak 27 sampel yang dibagi menjadi 3 kelompok, dimana masing-masing kelompok terdiri dari lapisan dentin 0,5mm, 0,6mm, dan 0,7mm. Hasil penelitian ini menunjukkan nilai rata-rata kekuatan fleksural pada GTC keramik-logam pada  ketebalan lapisan dentin 0,5 mm  adalah 95,32 MPa, 0,6 mm adalah 101,68 MPa, dan 0,7 mm adalah 104,30 MPa. Kesimpulan penelitian ini menunjukkan bahwa semakin tebal lapisan dentin maka dapat menghasilkan kekuatan fleksural yang optimal.

Rice husk is a waste product whose utilization is not optimal in Indonesia. Rice husks contain organic materials in the form of cellulose, hemicellulose, and lignin; and minerals in the form of silica, alkali, and trace elements. The silica content in rice husks is very high, ranging from 87-97% to other minerals. Silica nanoparticles from rice husks were synthesized through various methods, including the sol-gel method, the combustion method, and the combination method, to obtain the purity and size of the silica particles up to the manometer scale. Mixing silica nanoparticles from rice husk to dental material at a certain concentration is effective in producing better mechanical properties. Silica nanoparticles synthesized from rice husks have the potential as fillers and reinforcements that can improve the mechanical properties of dental materials. Besides that, the price is more economical because the raw materials come from Indonesian natural waste. This literature review aims to describe the method of synthesizing silica nanoparticles from rice husks and their effectiveness in improving the mechanical properties of dental materials.