There was still high caries incidence in abutment teeth (30.3%) in fixed denture treatment. One of the important components in luting cements to prevent caries in abutment teeth is the antibacterial and solubility properties of cement materials. This study aims to determine the difference of antibacterial activity and the solubility of three luting cements against S. mutans. 3 luting cement materials were RRGI (Fuji plus), Bioactive luting cement (Activa luting) and Resin Based composite (Relyx U200). Each of the materials had 7 samples sized of 5x1.5mm for antibacterial test against S. mutans and 15x1mm for solubility test. Data analysis was subsequently performed using an ANOVA test. There was a significant difference between the three luting cement in antibacterial tests against S. mutans, while in the solubility test gived no different to each other dental luting cements p = 0.107. Luting cement with the highest antibacterial is bioactive luting because the material can improve more hydroxyapatite and more fluorine against S. mutans.

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