[Durgical](https://durgical.com/en/) › [DurgiPedia](https://durgical.com/en/durgipedia/) › [Dentistry](https://durgical.com/en/dentistry/) › [Endodontics](https://durgical.com/en/dentistry/areas/endodontics/) › Root canal treatment: access, cleaning, shaping and filling # Root canal treatment: access, cleaning, shaping and filling - Procedure A root canal removes the dead or inflamed pulp, disinfects the canals and seals them. It saves the tooth; it is not a way to treat infection with antibiotics. Updated Nov 12, 2026 ## Key points - Access, length, shaping with irrigation, filling, coronal seal. - Rubber dam always. - Back teeth need cusp coverage afterwards. ## What it is Root canal treatment treats irreversible pulpitis, pulp necrosis and apical periodontitis by removing pulp tissue and bacteria from the canals and filling them so bacteria cannot return. Cleaning is done chemically as much as mechanically: files shape the canals so irrigants can reach and disinfect them. The tooth then needs a sealed, protective restoration. ## Indications and contraindications - Indications: irreversible pulpitis, pulp necrosis with or without apical periodontitis, and teeth that need a post or elective treatment for a crown. - Contraindications: a tooth that cannot be restored, a vertical root fracture, or too little bone support to keep it. - Rubber dam is mandatory: it keeps saliva out and prevents swallowing or inhaling instruments. - Working length is set with an electronic apex locator and a radiograph. - Most root canal treatments succeed when canals are well cleaned and the crown is sealed. ## How it is done - Confirm the diagnosis and restorability; give anaesthesia and place a rubber dam. - Cut an access cavity through the crown, remove the chamber roof and find every canal. - Measure the working length to the apical constriction. - Shape the canals with hand and rotary files while irrigating often with sodium hypochlorite. - Remove the smear layer with a chelating rinse; if a second visit is needed, place calcium hydroxide. - Fill the canals with gutta-percha and sealer and check with a radiograph. - Seal the access at once and plan the definitive restoration (cusp coverage for back teeth). ## Complications and pitfalls - Procedural mishaps: broken instruments, ledges, perforations and pushing irrigant or filling material past the apex. - Leakage through a lost temporary filling recontaminates the canals: the coronal seal matters as much as the root filling. - Antibiotics do not replace root canal treatment; they are only for spreading infection or systemic signs. ## Next step / Initial management - Irreversible pulpitis or necrosis: refer to the dentist; analgesia with an NSAID or paracetamol while waiting. - Molars with difficult anatomy, retreatment or a broken instrument: refer to an endodontist. - After treatment: a definitive restoration soon, and a radiograph at follow-up to check apical healing. ## Test yourself Think of the answer, then tap the question to see it. ## Why is rubber dam mandatory in root canal treatment? It keeps saliva and bacteria out of the canals and stops the patient swallowing or inhaling instruments and irrigant. ## What does the irrigant do that files cannot? It dissolves tissue and kills bacteria in parts of the canal system files do not touch. ## Which conditions make a tooth unsuitable for root canal treatment? A tooth that cannot be restored, a vertical root fracture or too little periodontal support. [Add to my cards (3)](https://durgical.app/estudiar/?add=/en/dentistry/root-canal-treatment-access-cleaning-shaping-and-filling/) ## Connections ## Related 5 - [Endodontic diagnosis: naming pulp and apical disease](https://durgical.com/en/dentistry/endodontic-diagnosis-naming-pulp-and-apical-disease/) - [Root canal anatomy tooth by tooth](https://durgical.com/en/dentistry/root-canal-anatomy-tooth-by-tooth/) - [Irrigants and dressings inside the canal](https://durgical.com/en/dentistry/irrigants-and-dressings-inside-the-canal/) - [Root canal filling materials and sealers](https://durgical.com/en/dentistry/root-canal-filling-materials-and-sealers/) - [Restoring the root-filled tooth: cusp coverage and posts](https://durgical.com/en/dentistry/restoring-the-root-filled-tooth-cusp-coverage-and-posts/) ## Related conditions 1 - [Dental caries](https://durgical.com/en/conditions/dental-caries/) ## In Pharmacology 2 - [Ibuprofen](https://durgical.com/en/pharmacology/ibuprofen/) - [Paracetamol](https://durgical.com/en/pharmacology/paracetamol/) [← All of dentistry](https://durgical.com/en/dentistry/) Educational content; it does not replace assessment by a dentist or doctor and is not a clinical instruction. For facial or neck swelling with difficulty swallowing or breathing, a knocked-out tooth or bleeding that will not stop, go to an emergency department at once. Sources: [Endodontics, Pulp Space Anatomy and Access Cavity of Anterior Teeth](https://www.ncbi.nlm.nih.gov/books/NBK618377/) (StatPearls Publishing (NCBI Bookshelf), 2025); [Endodontic Materials Used To Fill Root Canals](https://www.ncbi.nlm.nih.gov/books/NBK587367/) (StatPearls Publishing (NCBI Bookshelf), 2023); [Apical Periodontitis](https://www.ncbi.nlm.nih.gov/books/NBK589656/) (StatPearls Publishing (NCBI Bookshelf), 2023); [Endodontic Periapical Lesion: An Overview on the Etiology, Diagnosis and Current Treatment Modalities](https://pmc.ncbi.nlm.nih.gov/articles/PMC7398993/) (European Endodontic Journal (PMC open access), 2020). ## **Spotted a mistake?** We are always improving for the community. Tell us what is wrong and our team will review it. Report a mistake Representative model, for educational purposes only. --- Source: https://durgical.com/en/dentistry/root-canal-treatment-access-cleaning-shaping-and-filling/ License: CC BY 4.0 (https://creativecommons.org/licenses/by/4.0/). Cite as: DurgiPedia (durgical.com), https://durgical.com/en/dentistry/root-canal-treatment-access-cleaning-shaping-and-filling/