Preclinics of Conservative Dental Medicine · MU Sofia
40. Root canal content – types, removal of vital and non-vital pulp, armamentarium, techniques, mistakes.
Explains the kinds of content found in a root canal, from healthy or inflamed vital pulp to necrotic, gangrenous and old root-filling material, and how each is removed. Covers the barbed broach, H-files, K-files and irrigation, with a summary table of content types and a labelled picture of broach use. Walks through pulpectomy of vital pulp and the crown-down method for necrotic tissue, then lists common mistakes such as broach fracture, debris pushed past the apex and incomplete removal, with their causes and management.
Topic 40 of 53 in the MU Sofia syllabus for Preclinics of Conservative Dental Medicine (Dental Medicine, Year 3). The free AceMed note covers it in 6 sections, about 873 words (7 min of reading), with 17 flashcards.
In this note
Introduction
Types of root canal content
Armamentarium
Techniques step by step
Mistakes and what to do
Key points
Introduction
Root canal content is whatever fills the canal when treatment starts: vital pulp (healthy or inflamed), necrotic or infected tissue, or an old root filling. Its state decides how it is removed – vital pulp whole and under anaesthesia, necrotic content gradually from crown to apex. Careless or incomplete removal is a common cause of post-operative pain, flare-ups, discoloration and failure.
Types of root canal content
Exstirpatio pulpae (Latin, "rooting out of the pulp"), or pulpectomy, is removal of the whole vital pulp, coronal and radicular. Gangraena pulpae is necrotic pulp decomposed by mainly anaerobic bacteria, with a foul smell. Devitalising pastes (arsenic trioxide, paraformaldehyde) are no longer recommended: they are toxic and leakage can necrose gingiva and bone.
The aims of removal: take out all organic tissue (the substrate for bacteria), the bacteria and their toxins, and make room for instruments, irrigant and the filling.
Vital pulp is removed in one piece under anaesthesia; necrotic content is removed in stages from crown to apex, with irrigation, and is never pushed apically.
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