【名词&注释】
临床表现(clinical manifestation)、致病菌(pathogenic bacteria)、截根术(root amputation)、牙龈增生(gingival hyperplasia)、粘性放线菌(actinomyces viscosus)、牙颈部楔状缺损(wedge-shape defects of tooth)、牙龈退缩(gingival recession)、成功的关键因素(key successful factor)、根向复位瓣术、快速进展型牙周炎(rapidly progressive periodontitis)
[单选题]不属于创伤临床表现的为()
A. 牙龈退缩(gingival recession)
B. 龈缘常有边缘突起
C. 龈裂
D. 牙颈部楔状缺损
E. 牙龈松软