Pengaruh Penambahan Nanosilika Abu Cangkang Kelapa Sawit pada Bahan Basis Gigi Tiruan Resin Akrilik Polimerisasi Panas Terhadap Kekuatan Kompresi

Abstract

Heat polymerized acrylic resin (RAPP) is a material commonly used as a base for dentures due to its advantages in aesthetics, ease of manipulation, and relatively affordable price. However, RAPP has the disadvantage of low mechanical strength, particularly compressive strength, which can lead to fractures in denture bases. This research aims to determine the effect of adding nanosilica from palm kernel ash at concentrations of 5% and 6% on the compressive strength of RAPP-based denture bases. This study was carried out experimentally in the laboratory using a post-test only control group design with 30 cube-shaped samples according to ISO 604 standards, divided into three groups: control (without nanosilica), 5% nanosilica addition, and 6% nanosilica addition. The compressive strength test was conducted using a Universal Testing Machine, and the data were analyzed using one-way ANOVA and LSD tests. The results of this study showed an average value and standard deviation for the control group of 66.22 ± 1.27 MPa, the 5% concentration group of 75.46 ± 0.63 MPa, and the 6% concentration group of 80.19 ± 0.86 MPa. The results indicate that the group with the addition of 6% nanosilica has the highest compressive strength, followed by the 5% group, while the control group has the lowest. There is a significant effect (p=0.001) and a meaningful difference between the control group and the 6% group (p=0.001). This study concluded that the addition of nanosilica from palm oil shell ash, especially at a concentration of 6%, can significantly increase the compressive strength of RAPP.