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学习笔记|根尖通畅技术的临床应用考量(上)

  • 2026-04-27 09:29:11
学习笔记|根尖通畅技术的临床应用考量(上)

引言

根管预备是根管治疗的核心环节,但预备过程中根尖孔区域易因碎屑堆积引发并发症,影响治疗预后。根尖通畅是通过细锉越过根尖止点预备、维持根尖无碎屑的辅助技术,可清除根尖堵塞、稳定工作长度,但也因器械需超出根尖狭窄,引发术后疼痛、碎屑推出等争议。临床需精准判断应用场景,本学习笔记将围绕其内涵、优势与争议展开阐述,讨论不同临床情况下的应用决策,为规范化应用提供参考。

1、根尖通畅概述

1974 年 Schilder 首次提出根尖通畅理念,主张保留根尖孔原始形态的前提下,用小号器械清洁根尖区。1989 年 Buchanan 正式定义根尖通畅(apical patency),明确其核心是预防根尖阻塞、避免工作长度丧失,全程保持根尖段无碎屑。之后该技术逐步成为临床主流教学内容,1997 年美国 50% 牙科院校将其纳入教学,同时学界开始关注其潜在风险;2013 年我国第五版《牙体牙髓病学》教材明确根尖通畅概念,2021 年美国教授该技术的院校比例升至 73%。依据美国牙髓病学家协会(AAE)定义,根尖通畅是一种根尖制备技术,指在根管的根尖区域通过使用细锉超过根尖止点进行预备来保持根尖区无碎屑。

图1 根尖通畅的历史

规范操作是根尖通畅应用的关键。具体操作方法为,以电子根尖定位仪测定工作长度,用 #10 及更细不锈钢 K 锉蘸 EDTA,轻柔无压力进入根管,达工作长度后再推进 0.5mm,做≤15° 小幅往复旋转与提拉,不切削根尖狭窄,退出后大量冲洗,预备全程每次回锉均重复该步骤,通畅范围控制在超出根尖狭窄 0.5-1mm。

图2根尖通畅的实施方法

在应用根尖通畅时需严格规范操作,避免通畅演变为超预备。超预备是指预备过程中使用 #20 及以上大号锉强行拉开根尖孔,破坏根尖狭窄结构,而根尖通畅则是用小号锉被动疏通,完整保留根尖狭窄原始形态与大小。

图3 避免根尖通畅成为超预备

2、根尖通畅的优势

根尖通畅通过被动无切削疏通根尖狭窄,在感染控制、冲洗效率、充填质量、操作安全四大维度具备核心优势,尤其适用于感染重、易阻塞的复杂根管。

死髓牙与根尖周炎患牙的根尖区存在大量细菌生物膜、感染坏死组织及炎性渗出物,是根管清创的难点区域。根尖段一旦发生碎屑栓塞,会形成机械与化学预备的 “盲区”,导致感染物残留,成为治疗失败的主要原因。根尖通畅通过小号锉反复疏通,可彻底解除根尖栓塞,让机械预备器械直达根尖感染灶,同时为化学预备药物打通通路,实现根尖区感染的全面清除。体外实验证实,该技术可使根尖 1/3 粪肠球菌菌落数显著降低,细菌清除率提升约 65%,大幅提升清创彻底性。对于感染持续的患牙,根尖通畅可有效清创根尖区,显著改善根管治疗预后。

图4 根尖通畅增强根尖区感染的清理效果

化学预备是机械预备的重要补充,对于严重感染根管、器械无法抵达的根管狭区,充分冲洗是清除残留感染物的关键。次氯酸钠溶解有机组织时释放的氨和二氧化碳,会进一步加重根尖 1/3 气泡堆积,降低冲洗效果。根尖通畅可打破气锁效应,减少根管中、根 1/3 气泡数量并缩小气泡体积,降低冲洗剂渗透阻力,大幅增加抵达根尖 1/3 的冲洗剂量,让次氯酸钠、EDTA 充分作用于感染区域,实现机械与化学预备的优势互补。

图5 根尖通畅减少气泡产生,提高化学预备效率

三维严密封闭是根管充填的核心目标,也是保障远期疗效、防止微渗漏的关键。根尖区碎屑栓塞会导致主牙胶尖无法精准就位,封闭剂分布不均,侧方加压时压力传导受阻,最终造成根尖封闭不良。根尖通畅通过清除根尖碎屑栓塞,保障根管通路顺畅,使主牙胶尖精准到达工作长度,侧方加压的应力可有效集中于根尖区,让牙胶尖与根管壁紧密贴合,形成稳定的根尖止点。研究证实,通畅后的根管充填密合度显著提升,根尖区微渗漏风险大幅降低,相较于存在根尖栓塞的根管,封闭效果与充填质量更优,从充填环节降低治疗失败概率。

图6 根尖通畅提高根管充填质量,主尖与根尖段的充填更加密实

准确工作长度是根管治疗的基础,根尖阻塞易导致工作长度丢失,引发欠填、根尖偏移、台阶、侧穿等并发症。根尖通畅可消除碎屑对根尖定位仪的干扰,提升长度测量精准性。数据显示,弯曲根管中通畅组工作长度丢失率仅 6%,台阶与偏移发生率远低于非通畅组,有效降低弯曲、钙化根管的医源性损伤风险。

图7 根尖通畅维持工作长度,防止治疗并发症

3、根尖通畅的风险

根尖通畅的争议集中于术后疼痛、碎屑推出与根尖周刺激,核心是临床获益与操作风险的平衡问题。

根管治疗术后疼痛发生率为 3%~58%,部分学者及研究认为通畅操作会加重根尖周刺激。但循证证据表明,规范被动通畅不会增加急性疼痛风险,反而可通过缓解碎屑栓塞引发的根尖高压,降低术后疼痛程度,且不增加止痛药使用需求。临床研究证实,术后疼痛的核心影响因素是术前疼痛基线,而非根尖通畅技术本身。故目前的学界认为,规范操作下根尖通畅技术并不会诱发严重诊间急症,也不会增加止痛药的临床使用需求,其引起术后疼痛的风险较低。

图8 根尖通畅不会引发术后疼痛加重

另外,根尖通畅操作存在双向风险:不通畅易致根尖闭锁,过度通畅则可能将感染碎屑、冲洗剂推出根尖孔,刺激根尖周组织。早期研究认为通畅会增加碎屑推出量,体外实验显示通畅组根尖外碎屑量较非通畅组增加约 3 倍,活髓牙与粗大根管的碎屑推出风险更高。现有研究表明,碎屑推出风险与操作手法、根管直径密切相关。规范轻柔操作可有效控制风险,活髓牙、粗大根管因碎屑推出风险高,需谨慎应用。

小结

根尖通畅技术自 1974 年提出理念、1989 年正式定义后,已成为根管治疗核心辅助技术。其规范操作是用 #10 及以下小号锉,被动超出根尖狭窄 0.5-1mm 疏通,全程保留根尖狭窄结构,与破坏根尖孔的超预备不同。该技术具备四大核心优势:高效清除根尖感染、提升根管冲洗效率、优化充填密合度、稳定工作长度并降低预备并发症。其争议主要围绕术后疼痛与碎屑推出,循证证据证实,规范轻柔操作不会增加疼痛风险,而碎屑推出风险与操作、解剖相关,需进行个体化把控。

参考文献

— 向下滑动翻阅 —

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作者|闽梓恒

审核|张琛

编辑|史凯玥

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  1. CONNECT:[ UseTime:0.000500s ] mysql:host=127.0.0.1;port=3306;dbname=no_67808;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000858s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000301s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000272s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000488s ]
  6. SELECT * FROM `set` [ RunTime:0.000191s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000507s ]
  8. SELECT * FROM `article` WHERE `id` = 484175 LIMIT 1 [ RunTime:0.000423s ]
  9. UPDATE `article` SET `lasttime` = 1777272042 WHERE `id` = 484175 [ RunTime:0.001235s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 65 LIMIT 1 [ RunTime:0.000225s ]
  11. SELECT * FROM `article` WHERE `id` < 484175 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.000447s ]
  12. SELECT * FROM `article` WHERE `id` > 484175 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.000374s ]
  13. SELECT * FROM `article` WHERE `id` < 484175 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.000819s ]
  14. SELECT * FROM `article` WHERE `id` < 484175 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.001003s ]
  15. SELECT * FROM `article` WHERE `id` < 484175 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.001412s ]
0.079436s