PENGARUH PENYIKATAN MENGGUNAKAN BERBAGAI VARIASI BULU SIKAT GIGI TERHADAP KEKERASAN FIBER REINFORCED COMPOSITE JENIS POLYETHYLENE SEBAGAI CROWN AND BRIDGE

Fiber reinforced composite (FRC) can be used as alternative resin bonded prosthesis with less tooth preparation. FRC can improve strength, hardness, fatigue resistance, and Young�s modulus. The type of fiber that commonly used is Ultra-high molecular weight polyethylene (UHMWPE). The purpose of this research was to know the effect of tooth brushing with variety of bristles to polyethylene type of fiber reinforced composite hardness in crown and bridge. The reaserch was conducted with pre-post experimental method with 24 UHMWPE FRC samples and divided to 6 groups, each group divided into 4 UHMWPE FRC samples. Variety of bristle that used in the research was soft, medium and hard, and the period of brushing was 150 minutes and 300 minutes. Data were analyzed using two way ANOVA followed by LSD test. The results showed that the mean and standard deviation of delta (�) hardness UHMWPE FRC on brushing (in VHN) using soft-bristled in 150 minutes was 7.94 ± 0.5