牙周炎和牙周变性是不同的疾病。牙周炎是以牙龈发炎,牙周膜变性,牙槽骨普遍吸收,最后牙齿松动脱落为特点的一种慢性病变。本病是继发于存在口腔内的局部刺激而发展的,病变的晚期在儿童中少见。另一方面,牙周变性是一种自发的牙槽骨破坏。最初发病在切牙和第一磨牙区,但病的晚期 Periodontitis and periodontal degeneration are different diseases. Periodontitis is a chronic disease characterized by inflammation of the gums, degeneration of the periodontal ligament, general absorption of the alveolar bone and finally loss of teeth. The disease is secondary to the existence of local oral stimulation and the development of advanced lesions in children rare. On the other hand, periodontal degeneration is a spontaneous alveolar bone destruction. The initial incidence of incisors and first molar area, but the disease late