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学习笔记|根尖通畅技术的临床应用考量(下)

2026-05-11 21:42:06

基于根管感染状态的通畅决策

感染控制是根管治疗成功的核心，应根据根管感染状态决定根尖通畅技术的临床应用，规避潜在风险。感染根管主要包括死髓牙、伴根尖周炎的患牙，此类根管的核心病理特征为细菌及感染坏死物已溢出根尖孔，根尖区存在大量生物膜与炎性渗出物堆积，此时根尖通畅技术的核心价值远大于潜在风险：一方面可维持根尖通路开放，便于机械预备器械抵达根尖感染灶，有效清除根尖孔区的微生物及感染物；另一方面可打破根管气锁效应，增加次氯酸钠、EDTA 等冲洗剂向根尖段的输送量，提升化学预备效率，对存在持续感染的根管实现更彻底的化学清创，从而显著提高根管治疗的远期成功率。

非感染根管主要为活髓牙根管，此类根管无大量根尖孔外的感染组织及微生物，且根管解剖多较宽大，因牙本质碎屑堆积引发根尖偏移、工作长度丢失的风险本身较低，此时根尖通畅技术的临床价值有限，而潜在风险则成为主要考量因素。碎屑推出是根尖通畅技术最主要的争议点，即便该技术可减少根尖段碎屑阻塞，但若以碎屑推出根尖孔为代价，则会对根管治疗预后造成不良影响。临床研究证实，根尖通畅操作会导致更多牙本质碎屑被推出根尖孔，且后续冲洗过程中，通畅组会有更多冲洗液与碎屑共同外溢；尤其对于根管粗大、根尖孔较宽的患牙，碎屑推出的风险会进一步增加，同时反复超出根尖孔的机械操作还可能对健康的根尖周组织造成不必要的刺激。

图1 基于根管感染状态的决策

基于患者全身状况的通畅决策

使用根尖通畅技术也要考虑患者的全身因素。根尖通畅需要将通畅锉超过根尖孔，势必会刺激根尖周组织软硬组织。服用双磷酸盐的患者并不适合根尖通畅，因为患者可能无法耐受根尖通畅对根尖周骨组织的刺激。另外，根管治疗过程中可能会产生短暂菌血症，并且有将感染坏死物推出根尖孔的风险，故对于患有心脏瓣膜病和先天性心脏病的患者，或者器官移植以及因自身免疫病行免疫抑制的患者根尖通畅的使用也需慎重。

但在面对急性根尖周炎需要建立根尖引流通路，患者伴有上述全身疾病时，根尖通畅是否应该实施，如何实施仍值得探讨。研究发现，急性根尖周炎的治疗过程中，根尖区的疏通引流，建立排脓途径对于缓解患者症状及提高预后有重要作用。动物实验发现，动作轻柔，次数不超过5次的通畅不会导致双磷酸盐小鼠产生颌骨坏死。所以在面对伴有全身疾病的急性根尖周炎的患者，首次治疗时需要进行少量动作轻柔的根尖通畅适当建立排脓途径，而非禁止使用根尖通畅。

图2 基于全身状态的决策

再治疗根管中的通畅决策

根管再治疗的临床类型与失败原因存在显著差异，主要分为感染型再治疗与选择性再治疗，二者的治疗目标与病理特征不同，直接决定根尖通畅技术的应用必要性，需区别对待、精准施策。

感染型再治疗主要针对因根管感染控制不佳、遗漏根管导致治疗失败的患牙，此类患牙的根尖区多存在持续的细菌生物膜，且根管内残留既往充填材料，彻底清除根尖区的充填材料、实现根尖区的机械与化学清创，是再治疗成功的核心关键。临床学者一致认为，对于感染控制不佳的根管再治疗，应常规实施根尖通畅技术：通过通畅操作可疏通被充填材料、碎屑堵塞的根尖通路，便于器械抵达根尖感染灶，清除残留充填材料与细菌生物膜，同时提升冲洗剂的根尖渗透效率，实现更彻底的感染控制，为再治疗的远期成功奠定基础。

选择性再治疗主要针对仅需行冠部修复、无根尖区感染的患牙，此类再治疗的目标为去除冠部充填物、重新行冠部密封，无根尖区清创需求，此时根尖通畅技术的应用无明显临床价值，反而可能增加潜在风险。临床研究证实，根管再治疗过程中，无论是否建立根尖通畅，镍钛器械预备都会导致较多碎屑被推出根尖孔，而碎屑推出量的核心影响因素为器械种类与预备方式，而非根尖通畅技术本身；此时实施根尖通畅操作，不仅无法提升治疗效果，还可能增加根尖周组织的不必要刺激，因此无需常规应用。

图3 根管再治疗中的决策

基于根管解剖形态的通畅决策

根管解剖形态的复杂性是根管治疗并发症的重要诱因，也是根尖通畅技术应用决策的关键依据，临床需根据根管是否为弯曲钙化复杂根管、完全钙化闭锁根管实施差异化的应用策略，核心原则为 “扬长避短”，利用技术优势降低复杂根管的操作风险，同时规避技术对高危解剖根管的医源性损伤。

对于弯曲、钙化、细小的复杂根管，应常规实施根尖通畅技术，且从初尖锉达到工作长度直至根管充填完成全程维持：此类根管的治疗核心难点为易形成牙本质栓塞，进而导致工作长度丢失，这也是临床经验不足医师最常见的操作并发症；而根尖通畅技术可通过持续疏通根尖段，有效防止牙本质碎屑嵌塞，维持准确的工作长度，同时减少根管偏移、台阶形成等并发症的发生。此外，根尖通畅可保证根尖段无碎屑堵塞，使主牙胶尖精准就位至工作长度，提升根尖区充填的密合度，避免因碎屑干扰导致的根管充填不到位，进一步提高复杂根管治疗的成功率。

对于根管完全钙化闭锁的患牙，则不强调强行建立根尖通畅，核心考量为避免人为的医源性损伤：此类根管的根尖解剖结构模糊，强行使用通畅锉探通根尖，极易导致根管侧穿、根尖穿孔等严重并发症，反而加重患牙损伤，影响治疗预后。临床处理此类根管时，应首先通过锥形束计算机断层扫描（CBCT）等影像学检查手段，精准评估根管走向、钙化程度及建立根尖通畅的难度与可行性：对于评估为可行的病例，可在影像学引导下小心建立根尖通畅，以减少碎屑堆积与根管偏移，获得准确的工作长度；对于评估为建立难度过大的病例，应立即放弃强行通畅，避免医源性损伤。若此类患牙同时伴有根尖周的大量感染，且无法建立根尖通畅实现根管内清创，则应考虑后期行根尖外科手术治疗，而非继续根管内强行操作。

图4 基于根管解剖的决策

小结

根尖通畅技术的临床应用需遵循个体化、多维度决策原则，平衡临床获益与操作风险。依据根管感染状态，感染型根管推荐常规应用，非感染活髓牙需慎用；结合患者全身状况，双膦酸盐用药、心瓣膜病、免疫抑制等患者常规慎用，但在面对急性根尖周炎的急症状况时可轻柔短时操作建立引流。根管再治疗中，感染型再治疗需常规通畅，而仅因修复需要的选择性再治疗中则无需应用。同时考虑根管解剖情况，中重度弯曲及钙化细小的根管中应全程维持通畅，但面对完全钙化闭锁根管则不强行通畅，需经 CBCT 评估，必要时改行根尖手术等治疗方案，实现安全规范应用。

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