Analisis Patahan Semen Ionomer Kaca Modifikasi Resin setelah Penambahan 8% Berat Nano-Hidroksiapatit Sisik Ikan Nila (Oreochromis niloticus) yang Direkatkan pada Email Gigi

Abstract

Resin modified glass ionomer cement is a restorative material that requires special attention especially on its mechanical properties in order to produce strong adhesion to the tooth surface. The adhesive strength depends on the adhesive strength that occurs on the initial substrate (adherend). The strength of the adhesive can be marked on the type of fracture that occurs after the adhesive strength test is carried out. Several studies have shown that the addition of hydroxyapatite can increase the adhesive strength. Nano-hydroxyapatite synthesized from tilapia scales (Oreochromis niloticus) is an alternative that can be used to improve the mechanical properties of resin modified glass ionomer cement. Failure to adhere the restorative material to the tooth surface is divided into cohesive, adhesive, and mixed. The purpose of this study was to determine the differences and proportions of broken categories of resin modified glass ionomer cement without the addition of nano-hydroxyapatite and with the addition of 8% by weight nano-hydroxyapatite tilapia (Oreochromis niloticus) scales on tooth enamel. This study used samples that had previously been tested for tensile strength with two test groups, namely group 1 (without the addition of nanohydroxyapatite) and group 2 (addition of 8% by weight of nano-hydroxyapatite) (n=10). After testing the tensile adhesive strength, the samples were immersed in distilled water to keep them moist. Then, observation of the fault was carried out using a Stereomicroscope and Scanning Electron Microscope (SEM). The results of observing the fracture of the restorative material on the tooth enamel surface were then analyzed using the Chi-Square (p<0.05). The results of the fracture analysis in group 1 were the mixed failure 8 samples, cohesive failure 1 sample, and adhesive failure 1 sample. In group 2, namely mixed failure 10 samples. It can be concluded that there is no significant difference in fracture in groups 1 and 2. The best fracture occurred in group 2 with mixed failure 10 samples. The mixed failure category can occur if the restoration material can bond well to tooth enamel. The adhesive failure category indicates that there is less strong bond formed between the restoration material and the surface of tooth enamel. While cohesive failure shows that the adhesion strength in the interfacial exceeds the cohesion strength in the substrate of the restoration material or tooth enamel.