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"Latar Belakang : Enterococcus faecalis merupakan bakteri yang mampu membentuk biofilm dan banyak ditemukan pada kasus kegagalan perawatan saluran akar. Tujuan : Melihat daya antibakteri kitosan dan klorheksidin terhadap E. faecalis dalam biofilm. Metode : Deteksi dan kuantifikasi E. faecalis dalam biofilm yang hidup pasca pemaparan bahan uji, dengan real time PCR. Hasil : Terdapat perbedaan jumlah bakteri yang signifikan antara kedua kelompok bahan uji terhadap kontrol (p ≤ 0,05), tetapi tidak terdapat perbedaan bermakna antara kelompok kitosan dan klorheksidin. Kesimpulan : Daya antibakteri kitosan 2% terhadap biofilm E. faecalis sebanding dengan klorheksidin 2%. ......Background : Enterococcus faecalis has an ability to form biofilms and become a predominant bacteria that plays a major role in the etiology of persistent lesions after root canal treatment. Aim : To analyze the efficacy of chitosan and chlorhexidine against E. faecalis in biofilms. Methods : Detection and quantification of E. faecalis DNA that survive and live after immersing the biofilm in antibacterial solution, with real time PCR. Result : Statistically there is significant difference of living E. faecalis between chitosan and control and between 2% chlorhexidine and control (p ≤0,05). But there is no significant different between chitosan and chlorhexidine (p>0,05). Conclusion : Antibacterial effectivity of chitosan is equal to chlorhexidine against E. faecalis in biofilm."