| Abstrak/Abstract |
Composite dental resin consist of polymer with reinforcement materials, such as quartz, silica, glass, and short fibers, they generally came from natural resources that cannot be renewed.Natural fiber sisal (Agave sisalana), has an abundance of it and can be cultivated and renewed, which protects the environment's ecosystem. Generally, natural fibers are hydrophylic, but can change to hydrophobic by alkalization. This can be used an alternative reinforcement material to used instead in dental composite. This rearches used sisal fiber (Balittas-Malang), acrylic resin (QC-20). Alkalization used NaOH 6%, neutralization used acetic acid 2%. Utilities that used such were: SEM and universal testing machine. The data of 8 samples sized 60x10x4 mm were analysis with the independent t-test. The micro sisal preparation resulted in particle sized 0.075-100micrometre, the mean of unfilled acrylic resin was 109.20 + 3.12 MPa, micro sisal reinforced acrylic resin was 94.42+9.35 MPa (K) with significant difference. A decreasing flexural strength is caused by a change of characteristic from hydrophylic to hydrophobic and change to hydrophylic again in the neuralization process using acetate acid. Conclusion of this research was the addition of micro sisal without coupling agent reduced the flexural strength of acrylic resin
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