Modern techniques of a root canal obturation using thermoplasticized gutta‑percha allow for a filling of the root canal system in three dimensions. In spite of the advantages of thermal obturation methods it is important to note that warm gutta‑percha can result in a temperature increase on the external root surface. Immature teeth, teeth with thin walls (mandibular incisors) or teeth with internal resorption are complex, clinical cases, in which decision on the choice of the method should be made by the dentist. The results of the research on temperature rise of the external root surface in teeth with thin walls during root canal obturation are not conclusive. In order to evaluate the safety of warm gutta‑percha methods for periodontal tissues surrounding the tooth, more research should be conducted.

Key words: root canal obturation, temperature rise of root surface, thermoplasticized gutta‑percha, teeth with thin walls.