<![CDATA[The preparation of white mineral trioxide aggregate (WMTA) was carried out using a solid technique using silica (SiO2) from rice husk ash (RHA). The process included extraction of SiO2 from RHA, the effect of SiO2 composition on material characterization and material compressive strength. Silica was extracted from RHA using NaOH and washed with distilled water until it was sodium-free. WMTA was prepared by mixing extracted SiO2, Bi2O3 commercial (18.0%), CaO commercial and Al2O3 commercial (2.0%), and the mixture was heated at various temperatures (900, 1000, 1100 oC). MTA was made from two variation silica sources: RHA and extracted silica, and each source varied at 15, 20, and 25% by weight, while the CaO content was adjusted. Characterization was carried out by FT-IR spectrophotometry, XRD and UTM for compressive strength measurement conducted after cementation for a day. The RHA extraction results were obtained from sodium-free SiO2. The peak showed the success of WMTA preparation at wave number 910 cm-1 in FTIR spectra, indicating the presence of C-S-H and C3S, C2S, and C3A bonds both before and after thermal treatment in XRD data. The highest compressive strength test after cementation for one day (3.21±0.13MPa) was given by WMTA using RHA, heating at 900 oC, and the percentage of CaO and SiO2 were 60% and 20%, respectively.]]>
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