牙齦 琺瑯質 象牙質 牙髓腔 牙周韌帶 牙根管 牙髓(俗稱神經) 齒槽骨 Spirochete cause“ Trench mouth” 2016/5/12 Spirochetes-Junqi's Lecture for Medical students2016/5/12 Spirochetes-Junqi's Lecture for Medical Students 5 Spirochete cause “Trench mouth