牙内陷(dens invaginatus)为牙发育时期成釉器过度卷叠或局部过度增殖,深入到牙乳头中所致。牙萌出后,在牙面可出现一囊状深陷的窝洞。常见于上颌侧切牙,偶发于上颌中切牙或尖牙。根据牙内陷的深浅程度及其形态变异,临床上可分为畸形舌侧窝、畸形根面沟、畸形舌侧尖和 Dens invaginatus (dens invaginatus) for the period of tooth development excessive glaze enamel or local over-proliferation, deep into the tooth papilla caused. After the eruption of the tooth, there may be a deep hollow cavity in the tooth surface. Common in the maxillary lateral incisors, occasionally in the maxillary incisors or canines. According to the level of dental retraction and its morphological variation, clinically divided into deformity lingual fossa, deformity ditch, deformity lingual tip and