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A Root Canal Instrument Has Broken Inside: What Should Guide the Next Step?｜證據鏈
Separation of a root canal instrument is a technical event during treatment; it does not mean that the tooth has immediately failed. The questions that actually matter are where the fragment lies, whether it is before or beyond a curvature, whether it can be seen under microscopic visualisation, how far the canal had been cleaned before separation, and how much dentine retrieval would sacrifice. In a prospective clinical study, the overall completion rate for retrieval and bypassing combined was 70.5%; when the fragment was directly visible the study attempted retrieval and the completion rate was 85.3%, whereas for fragments that were not visible the study performed bypassing only, with no attempt at retrieval, and the completion rate was 47.7%. These are procedural rates from a particular team using a standardised protocol, not survival rates for an individual tooth. If forceful retrieval requires extensive removal of inner dentine, the original risk posed by a metal fragment may become a risk of perforation, ledging, or root weakening.
A Root Canal Instrument Has Broken Inside: What Should Guide the Next Step?｜證據鏈
本頁逐條列出本卡每一個 [Fn] 標記對應的文獻出處。
- F1｜Success rates for removing or bypassing fractured instruments: a prospective clinical study. [PMID:22414826]（https://pubmed.ncbi.nlm.nih.gov/22414826/）
- F2｜Incidence of Different Types of Intracanal Fracture of Nickel-Titanium Rotary Instruments: A Systematic Review. [PMID:34267014]（https://pubmed.ncbi.nlm.nih.gov/34267014/）
- F3｜Techniques to address fractured instruments in the middle or apical third of the root canal in human permanent teeth: a systematic review of the in vitro studies. [PMID:34698940]（https://pubmed.ncbi.nlm.nih.gov/34698940/）
- F4｜Assessment of Incidence, Management and Contributory Factors of Root Canal Instrument Separation in an Endodontics Post-Graduate Program: A Retrospective Clinical Study. [PMID:38317030]（https://pubmed.ncbi.nlm.nih.gov/38317030/）
- F5｜Factors affecting ultrasonic removal of separated endodontic instruments: A retrospective clinical study. [PMID:29532817]（https://pubmed.ncbi.nlm.nih.gov/29532817/）
FAQ
- Will a Fragment Left Inside Keep Rusting or Moving?
- Root canal instruments are usually made of stainless steel or nickel–titanium alloy. The central question in deciding whether treatment is needed is not imagined “rust”, but whether the fragment obstructs infection control, whether its position is stable, and whether the surrounding tooth structure can withstand the retrieval procedure.
- 中に残った破折片は、錆び続けたり移動したりしますか？ — 根管器具は通常、ステンレス鋼またはニッケルチタン合金です。処置が必要かを判断する要点は、想像される「錆」ではなく、破折片が感染制御を妨げるか、その位置が安定しているか、周囲の歯質が除去手技に耐えられるかです。
- Will a Fragment Left Inside Keep Rusting or Moving? — Root canal instruments are usually made of stainless steel or nickel–titanium alloy. The central question in deciding whether treatment is needed is not imagined “rust”, but whether the fragment obstructs infection control, whether its position is stable, and whether the surrounding tooth structure can withstand the retrieval procedure.
Source anchors
- Success rates for removing or bypassing fractured instruments: a prospective clinical study. [PMID:22414826] · https://pubmed.ncbi.nlm.nih.gov/22414826/ · 在 IDAEO 的其他引用
- Incidence of Different Types of Intracanal Fracture of Nickel-Titanium Rotary Instruments: A Systematic Review. [PMID:34267014] · https://pubmed.ncbi.nlm.nih.gov/34267014/ · 在 IDAEO 的其他引用
- Techniques to address fractured instruments in the middle or apical third of the root canal in human permanent teeth: a systematic review of the in vitro studies. [PMID:34698940] · https://pubmed.ncbi.nlm.nih.gov/34698940/ · 在 IDAEO 的其他引用
- Assessment of Incidence, Management and Contributory Factors of Root Canal Instrument Separation in an Endodontics Post-Graduate Program: A Retrospective Clinical Study. [PMID:38317030] · https://pubmed.ncbi.nlm.nih.gov/38317030/ · 在 IDAEO 的其他引用
- Factors affecting ultrasonic removal of separated endodontic instruments: A retrospective clinical study. [PMID:29532817] · https://pubmed.ncbi.nlm.nih.gov/29532817/ · 在 IDAEO 的其他引用
Cite this article
Lucy・《A Root Canal Instrument Has Broken Inside: What Should Guide the Next Step?｜證據鏈》・IDAEO 知識庫・2026-08-16・https://km.idaeo.ai/post/reports/dental-separated-instrument-decision-evidenceUpdated 2026-08-19