Antibacterial test of red ginger (Zingiber officinale var. rubrum) extracts at 10%, 30% and 60% on the growth of Streptococcus mutans: Uji antibakteri ekstrak jahe merah (Zingiber officinale var. rubrum) 10%, 30%, dan 60% terhadap pertumbuhan Streptococcus mutans

I Gusti Agung Ayu Hartini (Departemen Ilmu Konservasi Gigi FKG Univesitas Mahasaraswati Denpasar, Denpasar, Indonesia)
I Gusti Ngurah Bagus Tista (Departemen Ilmu Konservasi Gigi FKG Univesitas Mahasaraswati Denpasar, Denpasar, Indonesia)
Ni Made Bella Fransiska Anggraini (Departemen Ilmu Konservasi Gigi FKG Univesitas Mahasaraswati Denpasar, Denpasar, Indonesia)

MDJ (Makassar Dental Journal)
Vol. 15 No. 1 (2026): Volume 15 Issue 1 April 2026

Red ginger rhizome (Zingiber officinale var. rubrum) is a plant that is often used as a research material and contains antibacterial compounds such as flavo-noids, oleoresin, essential oils and tannins. This study explored the use of RG extract to inhibit the growth of Streptococcus mutans through laboratory experi-ments using a post-test only control group design, with 24 samples consisting of a positive control group treated with vancomycin antibiotics, and groups trea-ted with RG extract at concentrations of 10%, 30% and 60%. The inhibition power at a concentration of 10% was 6.5 mm, 30% was 6.83 mm, and 60% was 8.83 mm. The higher the extract concentration, the greater the amount of antibacterial compounds released. It was concluded that the inhibition power of RG extract concentrations of 10%, 30% and 60% could inhibit the growth of S.mutans; the 60% concentration was the most effective.