Combination effect of laser diode for photodynamic therapy with doxycycline on a wistar rat model of periodontitis oleh Suryani Dyah Astuti, Irawan Budi Utomo, Ernie Maduratna Setiawatie, Miratul Khasanah, Hery Purnobasuki, Deny Arifianto, Kartika Anggraini Alamsyah