Hubungan antara kuantitas serotipe, ekspresi gen glukosiltransferase, dan ekspresi gen luxs streptococcus mutans dengan aktivitas bakteri karies gigi kajian pada anak usia 3-5 tahun = The relationship between streptococcus mutans serotype quantity glucosyltransferase and luxs gene expression with dental caries bacterial activity study in children aged 3 5 years