中切牙根管闭锁较为少见,我院1997年～1998年共诊治3例,报告如下:本组3例均为男性,年龄分别为23岁、25岁和28岁,患者因牙痛、牙伸长为由就诊,问病史均告曾受外伤,病史最长6年,最短3年。口腔检查见1或1伸长,牙体颜色较深,为灰色、暗黑色,牙髓活力实验(-),叩痛(+)。Ｘ线查:3例牙? Central incisor root canal atresia is relatively rare, our hospital from 1997 to 1998, a total of 3 cases were treated, the report is as follows: The group of 3 patients were male, aged 23, 25 and 28 years, patients with toothache, Long by the treatment, ask the medical history have been told trauma, a history of up to 6 years, the shortest 3 years. Oral examination see 1 or 1 elongation, darker teeth, dark gray, pulp vitality experiments (-), percussion pain (+). X-ray examination: 3 cases of teeth?