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Abstrak :
Tujuan :Penelitian bertujuan untuk mengetahui pengaruh aplikasi gel acidulated phosphate fluoride terhadap perubahan warna material restoratif resin komposit bulk-fill flowable yang direndam dalam larutan kopi. Metode penelitian: Dua puluh spesimen resin komposit bulk-fill flowable berbentuk silinder berdiameter 6 mm dengan tebal 2 mm disiapkan kemudian dibagi menjadi 2 kelompok, dengan salah satu kelompok menerima aplikasi gel APF dan kelompok lainnya tidak. Setelah diberikan aplikasi gel, spesimen kemudian direndam di dalam larutan kopi (37oC) selama 7 hari. Pengukuran warna dilakukan dengan colorimeter pada saat sebelum perlakuan, setelah aplikasi gel APF dan setelah perendaman di dalam larutan kopi, kemudian dihitung nilai perubahan warnanya sesusai sistem CIE Lab. Analisis data menggunakan uji statistik Independent T-Test untuk menilai perbedaan perubahan warna antara kelompok dengan dan tanpa aplikasi gel APF. Hasil: Hasil menujukkan kelompok yang menerima gel APF mengalami perubahan warna yang lebih besar (p>0.05) daripada kelompok tanpa gel APF. Kesimpulan : Dari hasil penelitian, disimpulkan bahwa aplikasi gel APF memiliki pengaruh terhadap perubahan warna pada resin komposit bulk-fill flowable ......Objective: The aim of this study was to determine the effect of application of acidulated phosphate fluoride gel on the color change of bulk-fill flowable composite resin restorative material immersed in coffee. Methods: Twenty specimens of bulk-fill flowable composite resin in the form of cylinders 6 mm in diameter and 2 mm in thickness were prepared and then divided into 2 groups, with one group receiving APF gel application and the other group not. After being given the gel application, the specimens were then immersed in a coffee solution (37oC) for 7 days. Color measurement was carried out with a colorimeter before treatment, after application of APF gel and after immersion in coffee solution, then the value of the color change was calculated according to the CIE Lab system. Data was analyzed using the independent T-Test statistical test to assess differences in color change between groups with and without APF gel application. Results: The results showed that the group that received the APF gel had a greater color change (p> 0.05) than the group without APF gel application. Conclusion: From the results of the study, it was concluded that the application of APF gel had an effect on the color change of the flowable bulk-fill composite resin.