| dc.description.abstract | Resin modified glass ionomer cements require good adhesive strength as restorative materials. Several studies have shown that addition of hydroxyapatite can increase adhesive strength. Hydroxyapatite can be synthesized from tilapia scales (Oreochromis niloticus) and can be broken down into nanoparticles. Failure to adhere the restorative material to tooth surface is divided into cohesive, adhesive, and mixed. Purpose of this study was to determine differences and proportions failure categories of resin modified glass ionomer cement without addition and with addition of 2% weight nano-hydroxyapatite tilapia scales. This study used two test groups, group 1 (without addition of nano-hydroxyapatite) and group 2 (addition of 2% weight of nano-hydroxyapatite) (n=10). Nano-hydroxyapatite produced from 320 g of tilapia fish scales which are washed, dried, mashed, and sieved. The resulting powder was soaked in 250 ml HCl 0,1 M and rinsed and then in 50 ml NaOH 5% and 5 ml NaOH 50%, washed to an alkaline pH, calcined at 8000C for 1 hour, and reduced particle size with ball-mill. 2% weight powder was mixed into resin modified glass ionomer cement and bonded to enamel surface of the mounted teeth to obtain tensile adhesive strength test samples. Then, observation of failure using stereomicroscope and SEM. Data were analyzed using Chi-Square test (p<0.05). The results of the failure analysis were generally mixed failures, 8 samples in group 1 and 6 samples in group 2. In conclusion, there is no significant difference failure categories in groups 1 and 2. The best failure occurred in group 2. | en_US |
