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Apical Periodontitis: Causes, Symptoms & Treatment

Apical periodontitis is an inflammation of the tissue surrounding the root tip of a tooth, most commonly caused by a bacterial infection originating from the dental pulp.

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Things worth knowing about "Apical Periodontitis"

Apical periodontitis is an inflammation of the tissue surrounding the root tip of a tooth, most commonly caused by a bacterial infection originating from the dental pulp.

What is Apical Periodontitis?

Apical periodontitis (also known as periapical periodontitis) is an inflammatory condition affecting the tissues at the tip (apex) of a tooth root. It most commonly develops as a consequence of deep tooth decay, pulp inflammation (pulpitis), or a necrotic (dead) dental pulp, from which bacteria travel through the root canal system into the surrounding bone and connective tissue. It is one of the most prevalent dental conditions worldwide and a leading reason for dental visits.

Causes

In the vast majority of cases, apical periodontitis is caused by bacteria that originate from an infected or necrotic dental pulp and spread through the root canal into the periapical tissue. Common causes include:

Deep dental caries that has reached the pulp chamber
Dental trauma (e.g., a blow or fall affecting the tooth)
Failed or inadequate previous root canal treatments
Tooth fractures that allow bacterial entry into the pulp
Iatrogenic factors (caused by dental procedures)

Symptoms

Symptoms of apical periodontitis vary depending on whether the condition is acute or chronic:

Acute Apical Periodontitis

Severe, throbbing toothache with sensitivity to pressure
Pain when biting or chewing
Swelling of the surrounding gum tissue or face
Increased tooth mobility in severe cases
Systemic symptoms such as fever, particularly when an abscess has formed

Chronic Apical Periodontitis

Often asymptomatic or presenting with only mild, vague discomfort
Occasional sensation of pressure around the affected tooth
Formation of a dental sinus tract (fistula) through which pus can drain
Incidental finding on dental X-ray (periapical radiolucency)

Diagnosis

Diagnosis is made by a dentist using a combination of clinical and radiographic assessments:

Clinical examination: Percussion test (tapping on the tooth), palpation of surrounding tissue, visual inspection of the gums
Dental X-ray: A periapical radiolucency (dark area at the root tip) is a hallmark finding in chronic cases
Pulp vitality testing: Assessing whether the dental pulp is still vital (e.g., using a cold test)
Cone Beam Computed Tomography (CBCT): Used in complex or unclear cases for more detailed imaging

Treatment

The primary goal of treatment is to eliminate the bacterial infection and promote healing of the periapical tissues. The main treatment options include:

Root Canal Treatment (Endodontic Therapy)

Root canal treatment is the standard therapy for apical periodontitis. The procedure involves removing the infected or necrotic pulp, thoroughly disinfecting the root canal system, and sealing it to prevent reinfection. This approach allows the natural tooth to be preserved.

Apicoectomy (Root-End Surgery)

If root canal treatment is unsuccessful or insufficient, an apicoectomy may be performed. This minor surgical procedure involves the removal of the root tip and the adjacent infected tissue, followed by sealing the end of the root canal.

Antibiotic Therapy

Antibiotics are not used as a standalone treatment but may be prescribed as a supportive measure in cases of severe infection with abscess formation or systemic symptoms such as fever and swelling.

Tooth Extraction

When the tooth cannot be saved, extraction is the last resort. The missing tooth can subsequently be replaced with a dental implant or a bridge.

Prognosis and Outlook

With timely and appropriate treatment, the prognosis for apical periodontitis is generally favorable. Healing of the periapical bone can take several months to up to two years and is monitored regularly with follow-up X-rays. Left untreated, the condition can lead to serious complications, including jawbone destruction, abscess formation, and the spread of infection to adjacent anatomical structures.

References

European Society of Endodontology (ESE) - Quality guidelines for endodontic treatment: consensus report of the European Society of Endodontology. International Endodontic Journal, 2006.
Nair, P.N.R. - Pathogenesis of apical periodontitis and the causes of endodontic failures. Critical Reviews in Oral Biology & Medicine, 2004.
American Association of Endodontists (AAE) - Endodontics: Colleagues for Excellence - Diagnosis of Periapical Pathology, 2021.

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