Tujuan :Penelitian bertujuan untuk mengetahui pengaruh aplikasi gel acidulatedphosphate fluoride terhadap perubahan warna material restoratif resin komposit bulk-fillflowable yang direndam dalam larutan kopi. Metode penelitian: Dua puluh spesimenresin komposit bulk-fill flowable berbentuk silinder berdiameter 6 mm dengan tebal 2 mmdisiapkan kemudian dibagi menjadi 2 kelompok, dengan salah satu kelompok menerimaaplikasi gel APF dan kelompok lainnya tidak. Setelah diberikan aplikasi gel, spesimenkemudian direndam di dalam larutan kopi (37oC) selama 7 hari. Pengukuran warnadilakukan dengan colorimeter pada saat sebelum perlakuan, setelah aplikasi gel APF dansetelah perendaman di dalam larutan kopi, kemudian dihitung nilai perubahan warnanyasesusai sistem CIE Lab. Analisis data menggunakan uji statistik Independent T-Testuntuk menilai perbedaan perubahan warna antara kelompok dengan dan tanpa aplikasigel APF. Hasil: Hasil menujukkan kelompok yang menerima gel APF mengalamiperubahan warna yang lebih besar (p>0.05) daripada kelompok tanpa gel APF.Kesimpulan : Dari hasil penelitian, disimpulkan bahwa aplikasi gel APF memilikipengaruh terhadap perubahan warna pada resin komposit bulk-fill flowable

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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.