Abstract
Contact allergies are frequently encountered in dental practice, and their underlying causes are not readily apparent. These allergies can arise from allergic or anaphylactic responses triggered by commonly utilised dental materials in routine dental procedures or potentially result from the use of specific medications. This case presents a unique scenario involving a patient who sought prosthetic crowns following maxillary anterior teeth endodontic treatment. During the cementation of the prosthesis with glass ionomer cement, the patient unexpectedly experienced an acute allergic reaction in her upper lip. The patient received reassurance and was prescribed a 3-day course of oral corticosteroids and antihistamines, resulting in symptom relief within 24 h. This paper seeks to raise awareness among clinicians about the potential for contact allergic reactions and aims to emphasise the presentation and management of the uncommon incidence of angioedema during prosthodontic procedures.