Latar Belakang : E. faecalis merupakan bakteri yang mampu membentuk biofilm dan banyak ditemukan pada kasus kelainan periapeks. Tujuan : Mengetahui perbandingan daya antibakteri ekstrak kulit jeruk lemon (Citrus limon l.) dan klorheksidin 2% terhadap biofilm E. faecalis dari isolat klinis. Metode : Menilai kekeruhan larutan biofilm E. faecalis pasca pemaparan bahan uji, dengan ELISA reader. Hasil : Terdapat daya antibakteri ekstrak kulit jeruk lemon (Citrus limon l.) terhadap biofilm E. faecalis tetapi tidak terdapat perbedaan bermakna dengan klorheksidin 2% (p>0.05). Kesimpulan : Daya antibakteri ekstrak kulit jeruk lemon (Citrus limon l.) terhadap biofilm E. faecalis sebanding dengan klorheksidin 2%.

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ackground : E. faecalis has the ability to form biofilm and is often found in cases of periapical lesions. Aim: To compare the effectivity of lemon peel extract and 2% chlorhexidine against biofilm of E. faecalis. Method : Score the turbidity of E. faecalis biofilm after immersion in antibacterial agent, with ELISA reader. Result : Lemon peel extract has antibacterial effectivity against E. faecalis biofilm but has no significant difference compared to 2% chlorhexidine (p>0.05). Conclusion : Antibacterial effectivity of lemon peel extract against E. faecalis biofilm is equal to2% chlorhexidine.