案例杨某,男,7岁。某日被李某(男,37岁)用拳打击面部。当日,杨某被医院诊断为上唇粘膜挫伤,左上颌侧切牙、尖牙外伤性脱落。法医学检查:杨某上唇粘膜小片状淤血,左上颌中切牙、侧切牙及尖牙缺失。其中侧切牙、尖牙牙槽窝凹陷,其内可见血迹且触痛明显。中切牙牙槽窝内可见一新生 Case Yang, male, 7 years old. One day by Lee (male, 37 years old) hit the face with a punch. The same day, Yang was diagnosed by the hospital as the upper lip mucosal contusion, left maxillary incisor, canine traumatic off. Forensic examination: Yang labial mucosa patchy congestion, left maxillary incisor, lateral incisor and canine missing. Side of the incisors, canine groove dent, visible blood and visible tenderness. Incision in the alveolar nest visible a newborn