Kuwait Dental Board Endodontics key terms

A mild inflammatory condition of the dental pulp in which the tissue can still heal. Provoked pain is brief and resolves quickly after the stimulus is removed, and there is no spontaneous pain. Vital pulp therapy may succeed.

A severely inflamed pulp that cannot heal and will eventually necrose. It produces spontaneous, lingering pain that persists after the stimulus is removed and often wakes the patient at night. Root canal treatment or extraction is required.

Complete death of the pulp tissue, which loses blood supply and sensitivity. The tooth no longer responds to thermal or electric pulp testing and may show periapical radiolucency, discoloration, or a sinus tract. Root canal treatment is usually indicated.

A localized collection of pus in the periapical tissues caused by bacterial infection from a necrotic pulp. It presents with severe throbbing pain, tenderness to percussion, and often swelling; urgent drainage is needed.

A narrow channel that drains pus from a chronic periapical infection through bone and mucosa to the skin or oral cavity. It usually appears as a small pustule or dimple, is often painless, and closes after the source of infection is treated.

A persistent low-grade inflammation around the root apex, usually caused by a necrotic or previously treated pulp. It is often asymptomatic and appears radiographically as a periapical radiolucency with a sclerotic border; bacteria in the canal system maintain it.

A dark area on a radiograph at the root apex that indicates loss of bone, typically from chronic apical periodontitis or a healing lesion. Its size and borders help assess disease extent and monitor healing after treatment.

The use of cold, heat, or electric current to assess whether pulp nerve fibers respond, helping distinguish normal, inflamed, and necrotic pulps. Results are compared with adjacent teeth, and a nonresponse indicates a necrotic or previously treated pulp.

Tapping a tooth with a finger or instrument handle to detect inflammation in the periodontal ligament. A painful response suggests periapical inflammation or trauma, helping localize the offending tooth and assess acute disease.

The distance from a coronal reference point to the intended apical limit of instrumentation, usually just short of the radiographic apex. It is established with an apex locator and confirmed radiographically to prevent under- or over-instrumentation.

An electronic device that measures electrical impedance between the canal file and the periodontal tissues to locate the apical constriction. It is accurate in most canals and reduces reliance on radiographs for working length.

The narrowest point of the root canal near the apical foramen, where the canal meets the periodontal tissues. It is the ideal apical limit for cleaning, shaping, and obturation, and is typically 0.5 to 1 mm short of the radiographic apex.

The surgical removal of tooth structure to create a straight-line path to the canal orifices. It must give unobstructed access to all canals, preserve sound tooth structure, and allow proper cleaning, shaping, and obturation.

The entrance to a root canal located on the floor of the pulp chamber. Finding all orifices, including extra ones, is essential to avoid missed canals and persistent infection; magnification and staining help identify them.

An untreated root canal that was not located or instrumented during treatment, usually because of inadequate access or complex anatomy. It commonly causes persistent symptoms or failure and is a frequent finding in retreatment cases.

A shaping approach in which the coronal portion of the canal is enlarged before the apical portion. It improves access and irrigation, reduces the risk of pushing debris apically, and is common with rotary nickel-titanium instruments.

Flexible engine-driven files made of nickel-titanium alloy that shape curved canals efficiently with less ledging than stainless steel hand files. They require torque and speed control, and files may separate by cyclic fatigue or torsional failure.

The breakage of a file inside a canal, leaving a fragment that may block access to the apical region. It results from cyclic fatigue or torsional stress and is managed by bypassing, retrieval, or occasionally surgery.

Chemical cleaning of the root canal system with solutions such as sodium hypochlorite and EDTA to dissolve tissue, disinfect, and remove debris. It reaches areas instruments cannot, and activation methods and safe delivery are essential.

The primary endodontic irrigant, valued for dissolving necrotic tissue and killing microorganisms. It is used at concentrations of about 0.5% to 5.25% and must be kept within the canal, because extrusion can cause severe tissue injury.

A thin layer of organic and inorganic debris created on canal walls by instrumentation. It can harbor bacteria and block dentinal tubules, so it is removed with chelating agents such as EDTA before obturation.

The three-dimensional filling of the cleaned and shaped root canal system to prevent reinfection. Gutta-percha with a sealer is the most common material, and the technique aims to seal the entire canal space to the apical constriction.

A natural rubber-based material used with a sealer to fill root canals. It is thermoplastic, biocompatible, and radiopaque, and it can be compacted by cold lateral or warm vertical techniques.

A cement or resin placed with gutta-percha to fill gaps and irregularities between the core material and canal walls. It provides adhesion and antimicrobial activity, and its properties influence the quality of the final seal.

A nonsurgical procedure to remove existing root filling material, re-clean and reshape the canal system, and re-obturate. It is indicated when initial treatment fails, often because of missed canals, inadequate cleaning, or coronal leakage.

A surgical procedure that exposes the root apex, removes infected tissue, resects the root tip, and seals the canal with a retrograde filling. It is used when nonsurgical retreatment is not feasible or has failed.

A surgical technique using barrier membranes with or without bone grafts to promote healing of periapical bone defects. It is considered in large lesions or through-and-through defects where regeneration is desired.

A biologically based approach that aims to restore pulp-like tissue and continued root development in immature necrotic teeth. It typically involves disinfection, a blood clot scaffold, and a coronal seal, and is especially valuable in young permanent teeth.

A procedure that induces a calcified barrier at the open apex of an immature necrotic tooth so it can be obturated. It differs from regenerative endodontics, which seeks vital tissue regeneration rather than a hard-tissue barrier.

Trauma that displaces a tooth from its normal position, including concussion, subluxation, extrusion, lateral luxation, and intrusion. Each type has specific repositioning and splinting protocols and risks of pulp necrosis and root resorption.

Complete displacement of a tooth from its socket. Prompt replantation or storage in a suitable medium preserves periodontal ligament cells, and treatment includes splinting and often root canal treatment to prevent inflammatory resorption.

The stabilization of traumatized or replanted teeth with a flexible splint for a defined period. It supports healing of the periodontal ligament while allowing physiologic movement and minimizing ankylosis.

An acute exacerbation of pain or swelling after a root canal appointment in a previously asymptomatic tooth. Causes include microbial extrusion, incomplete instrumentation, or a change in the intracanal environment, and it is managed by drainage and analgesia.

Analgesics such as ibuprofen that reduce pain and inflammation by inhibiting cyclooxygenase enzymes. They are first-line for endodontic pain, but caution is needed in patients with gastrointestinal, renal, or cardiovascular risk.

The reversible loss of sensation in a region produced by agents such as lidocaine or articaine. Effective anesthesia is essential for pain-free endodontics, and supplemental techniques may be needed for irreversible pulpitis.

Three-dimensional imaging that provides detailed views of root canal anatomy, fractures, and periapical lesions. It uses lower radiation than medical CT and is valuable when two-dimensional radiographs are inconclusive, but its use should follow justification principles.

A barrier that isolates the operative field from oral fluids and bacteria during endodontic treatment. It protects the patient from irrigant and instrument accidents and maintains a clean, dry field for obturation.

Clinical decision-making that integrates the best available research evidence with clinical expertise and patient values. It involves critical appraisal of studies such as randomized trials and systematic reviews to guide treatment choices.