Root Canal Therapy: A Complete Guide

The clinical phases of endodontic treatment, from diagnosis to final filling, and why rubber dam isolation and chemical cleaning matter as much as mechanical canal shaping.

Root canal therapy, commonly called a root canal, is the procedure that removes the dental pulp — the vascular-nerve tissue at the center of the tooth — when it's irreversibly inflamed or necrotic, typically due to deep decay or trauma. According to the Italian Society of Endodontics (SIE), modern treatment is based on evidence-based procedures and materials at every stage, from three-dimensional radiographic diagnosis to filling with bioactive cements, with the primary goal of avoiding extraction while preserving the natural tooth with long-term chewing function comparable to an intact tooth.

The first clinical step, after radiographic diagnosis, is local anesthesia followed by placement of the rubber dam: a sheet that isolates the tooth from the rest of the oral cavity, preventing saliva — rich in bacteria — from recontaminating the canal during treatment while also protecting the patient from accidental ingestion of instruments or irrigating solutions. It's a step often underestimated from a perceptual standpoint, but the endodontic literature considers it an essential requirement for result predictability, not an operational convenience option.

Once the pulp chamber is opened through the crown, the dentist locates the canal orifices and proceeds with shaping: mechanical preparation of the canal lumen using manual or rotary nickel-titanium instruments, which gives the canal a tapered shape useful both for mechanically removing pulp, bacteria and infected dentin, and for allowing irrigating solutions — typically sodium hypochlorite, alternated with chelating solutions like EDTA — to penetrate deeply and complete chemical disinfection. Mechanical shaping and chemical cleaning work in synergy: neither alone guarantees sterility of the canal system, given its anatomical complexity of accessory canals, isthmuses and branchings often invisible even to careful radiographic inspection.

Once cleaning is complete, the canal is dried and three-dimensionally sealed with gutta-percha — a biocompatible thermoplastic rubber — combined with a sealer cement, using techniques ranging from cold lateral condensation to more modern warm techniques or single-cone bioceramic sealers. A root-canal-treated tooth, if adequately restored coronally, stops being a potential infectious reservoir and can resume normal chewing function; the success rate of a correctly performed root canal treatment is, under normal clinical conditions, very high.

On Oralzon you'll find the full range of instrumentation for root canal therapy: rubber dams and placement kits, nickel-titanium rotary instruments, irrigating solutions, gutta-percha and sealer cements to complete every phase of treatment with professional-grade materials.