复杂冠根折是一种多由外伤等导致牙体硬组织损伤并伴有牙髓暴露的牙外伤类型，常累及龈下区域。本文报道1例30岁男性患者因摔倒致左上前牙折断1周就诊，患者1周前外伤造成左上前牙折裂，于外院去除断裂的牙冠，经服药后疼痛肿胀症状缓解，仍存在牙体缺损、疼痛不适，影响咀嚼与美观。口腔检查示21、22牙颈部折断，21断面不规则，唇侧断面平齐龈缘，腭侧断面位于龈下约2 mm，22唇腭侧断面平齐龈缘，21、22残根周缘牙龈轻度红肿，根管口探痛（+），叩痛（±），牙齿无松动；结合病史、临床检查及影像学表现确诊为21、22复杂冠根折，21、22经根管治疗后行正畸牵引，牵引结束评估软组织形态后实施牙龈切除术，再行纤维桩核及21、22全瓷联冠修复；修复后1年随访显示牙龈稳定、修复体固位良好、邻接关系正常，表明正畸牵引后桩核联冠修复可有效保留折裂至龈下的残根并实现功能与美学双重恢复。

Complex crown-root fracture is a type of dental trauma caused primarily by external forces, characterized by damage to dental hard tissues accompanied by pulp exposure, and often involving the subgingival region. This article reports a case of a 30-year-old male patient with fractured left upper anterior teeth. The patient had had fractured left upper anterior teeth for one week. The fractured crown was removed at another dental institution. Although the pain and swelling were relieved with medication, the tooth defect and discomforts persisted, affecting mastication and aesthetics. Intraoral examination revealed cervical fractures of the incisors (teeth 21 and 22). The fracture surface of incisor tooth 21 was irregular, with the labial fracture line level with the gingival margin and the palatal fracture line located approximately 2 mm below the gingival margin. The labial and palatal fracture lines of tooth 22 were level with the gingival margin. The gingiva surrounding the residual roots of teeth 21 and 22 exhibited mild redness and swelling, with tenderness on probing of the root canal orifices (+) and tenderness on percussion (±), and no tooth mobility. Based on the medical history, clinical examination, and radiographic findings, a diagnosis of complex crown-root fracture of teeth 21 and 22 was established. After root canal therapy, orthodontic extrusion was performed on teeth 21 and 22. Following completion of extrusion and assessment of the soft tissue morphology, gingivectomy was carried out, followed by fiber post-core placement and all-ceramic splinted crown restoration of teeth 21 and 22. A 1-year follow-up after restoration revealed stable gingival conditions, good retention of the restorations, and normal proximal contacts, demonstrating that post-core splinted crown restoration following orthodontic extrusion can effectively preserve residual roots fractured to the subgingival region and achieve both functional and aesthetic recovery.