Kekuatan Rekat Tarik Semen Ionomer Kaca Modifikasi Resin dengan Penambahan 2, 5, 8%Berat Nano-Hidroksiapatit dari Sisik Ikan Nila yang Dikalsinasi pada Suhu 1000oc terhadap Email Gigi

Abstract

Resin modified glass ionomer cement (RMGIC) has low tensile bond strength. This needs to be paid attention to because it will receive various kinds of forces in the oral cavity. The tensile bond strength of RMGIC can be increased by the addition of nano-hydroxyapatite. Nano-hydroxyapatite can be synthesized from natural materials such as tilapia fish scales. The aim of this research was to analyze differences in the tensile bond strength of RMGIC after the addition of 2, 5, and 8% by weight of nanohydroxyapatite of tilapia fish scales calcined at 1000°C to tooth enamel. Nanohydroxyapatite was obtained from tilapia fish scales through a calcination process at 1000°C for 2 hours and the size was reduced using a ball-mill at 350 rpm for 1 hour. Then the hydroxyapatite particles were measured using a particle size analyzer. The research sample was in the form of a tablet with a diameter of 4 mm and a height of 2 mm. A total of 40 samples were divided into four groups, namely without addition and addition of 2, 5, and 8% by weight of nano-hydroxyapatite. The sample was bonded to the palatal surface of premolar tooth enamel after being embedded in self-polymerizing acrylic resin. The enamel surface is removed by 0.005mm, smeared with dentinconditioner for 20 seconds, and placed on the master-cast. The ratio of RMGIC powder:nano-hydroxyapatite:liquid in groups 2, 3 and 4 is 0.123:0.002:0.05g; 0.119:0.006:0.05g; and 0.115:0.010:0.05g. After being stirred homogeneously, the material is put into a mold with a diameter of 4 mm and a height of 2 mm which is placed on the tooth surface. The mold was covered with a celluloid strip and then illuminated with LED light cure for 40 seconds. The samples were soaked in distilled water for 24 hours before being tested for tensile bond strength using a universal testing machine. The average results of tensile bond strength in groups 1, 2, 3, and 4 were 6.34 ± 0.52 MPa, 7.34 ± 0.21 MPa 7.82 ± 0.21 MPa; and 9.01 ± 0.31 MPa. The results of the Kruskal Wallis test showed that there was a significant difference in tensile bond strength between groups (p<0.05). It can be concluded that there is a difference in the tensile bond strength of RMGIC after the addition of 2, 5, and 8% by weight of nano-hydroxyapatite of tilapia fish scales to tooth enamel. The tensile bond strength value of RMGIC was highest with the addition of 8% by weight of nanohydroxyapatite.