Latar Belakang: Rosela dilaporkan sebagai agen antiradang.Tujuan: menganalisis efektivitas ekstrak etanol terstandar kelopak rosela terhadap penyembuhan ulser mukosa mulut.Metode: Dua belas tikus dibagi dalam kelompok kontrol dan perlakuan. Ekstrak 3.75% dan 7.5% dioleskan 2 kali sehari pada mukosa mulut. Pengamatan dilakukan selama 3 dan 7 hari. Kemerahan dan pembengkakan jaringan sekitar diamati secara visual. Diameter ulser diukur satu hari setelah dibuat dan sebelum dikorbankan. Spesimen dibuat, diamati secara mikroskopis, dan dilakukan skoring.Hasil: Diameter ulser dan skor radang menurun. Kemerahan dan pembengkakan jaringan sekitar tidak terlihat lagi.Simpulan: Ekstrak 7.5% efektif terhadap penyembuhan ulser mukosa mulut tikus.

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Background: Roselle is reported as anti-inflammatory agent.Objectives: To analyze standardized roselle calyces ethanol extract efficacy`s towards oral mucous ulcer.Methods: Twelve rats were divided into 2 groups; control and experimental group. The 3.75% and 7.5% extract were applied topically twice a day in oral mucous. Animals were observed for 3 and 7 days. Redness and swelling were observed visually. Ulcer diameter was measured a day after creation and before sacrifice. Specimens were observed microscopically and scored.Results: Ulcer diameter and inflammation score were decreased. No redness and swelling observed.Conclusions: The 7.5% extract is effective for the ulcer.