Pendahuluan; streptococcus mutans merupakan bakteri patogen utama penyebab karies, pengobatan karies dapat dilakukan secara tradisional dengan tanaman obat, antara lain sereh dan jahe. Tujuan;  mengetahui perbandingan efektivitas ekstrak daun serai wangi  dengan ekstrak jahe terhadap Streptococcus mutans. Metode; penelitian eksperimental metabolik dengan desain posttest-only control group design. Pengumpulan data dengan mengukur diameter zona hambat menggunakan kaliper geser. Data dianalisis dengan menggunakan uji ANOVA satu arah. Hasil; menunjukkan bahwa diameter hambat rata-rata ekstrak serai wangi 20% adalah 12,00 ± 0,23, dan ekstrak jahe 20% adalah 9,00 ± 0,27 dalam menghambat pertumbuhan Streptococcus mutans, sedangkan kontrol negatif (DMSO) tidak terdapat hambatan. Kesimpulan bahwa terdapat perbedaan efektifitas ekstrak serai wangi (Cymbopogon nardus) 20% dan temulawak (Curcuma xanthorrhiza) 20% dalam menghambat pertumbuhan mutan Streptococcus.

Pendahuluan; karies gigi penyakit jaringan gigi yang ditandai dengan kerusakan jaringan, mulai dari permukaan email hingga dentin, dan meluas hingga pulpa. Tujuan; mengetahui perbandingan efektivitas ekstrak daun mangga (Mangifera foetida L) dengan ekstrak daun pepaya (Carica papaya) dalam menghambat pertumbuhan Streptococcus mutans. Metode; penelitian eksperimental laboratoris dengan desain posttest only control group in vitro. Analisis yang digunakan adalah Oneway ANOVA. Hasil; menunjukkan dari rata-rata diameter hambat ekstrak daun mangga 50% terhadap pertumbuhan Streptococcus mutans adalah 13,16 ± 0,27, dan rata-rata diameter hambat ekstrak daun pepaya 50% terhadap pertumbuhan Streptococcus mutans adalah 9,18 ± 0,23. Kesimpulan; bahwa terdapat perbedaan keefektifan ekstrak daun mangga cincang dan ekstrak daun pepaya terhadap Streptococcus mutans

Composite resin is a caries filling material. Generally, dentists choose this type ofresin as a restoration material because this material has a high compressivestrength. There are several factors that influence the compressive strength ofcomposite resins, including beverages consumed such as coffee. This study aims todetermine the difference in the compressive strength of the composite resin withSidikalang coffee immersion in 9 hours, 27 hours and 54 hours immersion time.This type of research is experimental laboratories with posttest only control groupdesign. The research sample was composite resin measuring 8 mm in diameter and4 mm in height. The sample size is determined by the Federer formula and a totalsample of 24 was obtained for the four treatment groups. Measurement ofcompressive strength using a three-point bending tool on a universal testingmachine. Data were analyzed by using the oneway Anova test. Based on the resultsof the study, the average compressive strength of composite resin in the groupwithout immersion, 9 hours, 27 hours and 54 hours of immersion was 20.69 ± 0.84,18.94 ± 0.41, 14.36 ± 0.66 and 6.70 ± 0.48. From the results of the study it can beconcluded that the ads are a significant difference in the average compressivestrength of composite resin after immersion in Sidikalang coffee for 9 hours, 27hours and 54 hours.

Composite resin is a caries filling material. Generally, dentists choose this type of resin as a restoration material because this material has a high compressive strength. There are several factors that influence the compressive strength of composite resins, including beverages consumed such as coffee. This study aims to determine the difference in the compressive strength of the composite resin with Sidikalang coffee immersion in 9 hours, 27 hours and 54 hours immersion time. This type of research is experimental laboratories with posttest only control group design. The research sample was composite resin measuring 8 mm in diameter and 4 mm in height. The sample size is determined by the Federer formula and a total sample of 24 was obtained for the four treatment groups. Measurement of compressive strength using a three-point bending tool on a universal testing machine. Data were analyzed by using the oneway Anova test. Based on the results of the study, the average compressive strength of composite resin in the group without immersion, 9 hours, 27 hours and 54 hours of immersion was 20.69 ± 0.84, 18.94 ± 0.41, 14.36 ± 0.66 and 6.70 ± 0.48. From the results of the study it can be concluded that the ads are a significant difference in the average compressive strength of composite resin after immersion in Sidikalang coffee for 9 hours, 27 hours and 54 hours.