Root fractures of human permanent teeth are usually caused by high-impact force such as trauma or excessive occlusal forces. Accurate diagnosis of tooth root fracture is essential to assess the prognosis and determine appropriate treatment for the tooth. Intraoral radiography has been commonly used for diagnosing root fractures. However, root fractures are difficult to detect on intraoral radiographs during an initial examination immediately after fracture. Recently, dental cone beam CT (dental CT), with its wide adoption, has been used to detect root fractures that cannot be identified with intraoral radiography. However, many studies have reported that artifacts caused by root canal filling materials on dental CT images reduced the diagnostic accuracy for root fractures. In this presentation, I will introduce the research findings regarding the pattern of artifact based on our phantom study and the latest research on the development of the dental CT machine and dental materials to reduce these artifacts. I hope this presentation will be useful for your clinical diagnosis of root fractures and contribute to the advancement of new research.