在青少年中流行的一种牙周病是限局性青少年型牙周炎(localized juvenile period-ontitis 简称 LJP),本文复习了 LJP 的临床特征,并证实本病为一种特殊口腔微生物一放线共生放线杆菌(简称 A.a)所引起。临床上 LJP 是以齿槽骨吸收为特征,最常累及第一恒磨牙及切牙,通常在10～15岁变得明显,齿槽骨局部性吸收常导致 X 线上弧形骨质缺损,牙周袋形成区的牙根表面上常有菌 A type of periodontal disease prevailing in adolescents is localized juvenile period-ontitis (LJP). This article reviews the clinical features of LJP and confirms that the disease is a line-specific symbiosis of oral micro-organisms Actinobacillus (referred to as Aa) caused. Clinically, LJP is characterized by alveolar bone resorption, most often involving the first permanent molars and incisors, which usually become apparent at 10 to 15 years of age. Localized alveolar bone absorption often results in arcuate bone defects on the X-ray, Periodontal pocket formation zone root surface often bacteria