Deposition of calcified tissue around an overextended gutta-percha cone: case report

Case report Root canal treatment was performed in a mandibular right second premolar with a periapical lesion and apical resorption. The root canal wa s prepared with K-files using the step-back technique and 3% NaOCl as an ir rigant; during obturation gross overfilling of gutta-percha occurred, The t ooth was permanently restored with a post and core along with a crown. Alth ough healing of the periapical lesion occurred and the patient reported tha t he was symptom-free, the tooth was extracted after 4 years because of a s ubgingival root: fracture, Following extraction the tooth was examined with SEM. The examination revealed the presence of newly formed calcified tissu e at resorption sites on the root apex, This newly formed tissue extended f rom the surface of the root around the apex to the extruded gutta-percha co ne to which it was well adapted, forming a bridge between the cone and the root.