Emmanuel Mazinis

Antibiotics in Endodontic Treatment: Indications, Timing and International Guidelines

In infections of endodontic origin, the relationship between prescription and the time elapsed since the onset is closely associated with the stage and extent of disease progression. During the early phase of reversible or irreversible pulpitis, the condition is primarily inflammatory in nature rather than systemic. At this stage, microorganisms are confined within the pulp chamber and systemic antibiotics offer no therapeutic benefit. Appropriate management relies on caries removal, pulpotomy, or root canal therapy.

With disease progression, untreated pulpal inflammation may result in pulpal necrosis and the subsequent development of apical periodontitis. When the infection remains localized to the periapical tissues, antibiotic therapy is still not indicated. Infection control can be achieved through mechanical debridement, irrigation, and the use of intracanal medicaments.

Systemic antibiotic administration is strictly reserved as an adjunct when apical periodontitis presents with evidence of systemic involvement, malaise, or lymphadenopath, or when the inflammatory process extends to local tissues, resulting in diffuse facial swelling or cellulitis. Antibiotics should be prescribed to patients with compromised medical histories or in advanced disease stages where immediate mechanical treatment is unfeasible, ensuring they serve as a supportive measure rather than a replacement for surgical debridement or root canal therapy.

A critical factor is the time elapsed since the initial onset of inflammation, in combination with the possible use of analgesics, anti-inflammatory medications, or other systemic therapies that may mask the early symptoms.

According to current international guidelines, a clear understanding of the progression of inflammation enables clinicians to minimize unnecessary antibiotic prescriptions, ensure effective management of advanced infections, and reduce the risk of antimicrobial resistance.

Emmanuel Mazinis DDS, MSc, PhD, FICD
Assistant Professor
Department of Endodontology, Aristotle University of Thessaloniki, Greece

Emmanuel Mazinis received his DDS from the School of Dentistry at the Aristotle University of Thessaloniki (AUTh), Greece. He completed his specialization in Endodontology and obtained his PhD from the Department of Endodontology at the same institution.
In 2025, he was elected to the position of Assistant Professor in the Department of Endodontology at the School of Dentistry at the Aristotle University of Thessaloniki (AUTh), where he currently serves as Supervisor of Preclinical Endodontics. He has delivered numerous presentations and publications in national and international peer-reviewed journals. He is the author of a book on Endodontic Radiology, has contributed chapters to edited educational and international volumes and serves as a reviewer for several scientific journals.