{Reference Type}: Case Reports {Title}: Endodontic Retreatment of a Mandibular Second Molar With a C-shaped Root Canal Configuration: A Case Report. {Author}: Liu H;Shen Y; {Journal}: Cureus {Volume}: 16 {Issue}: 1 {Year}: 2024 Jan 暂无{DOI}: 10.7759/cureus.52812 {Abstract}: Root canal retreatment in mandibular second molars with C-shaped root canal configurations presents notable challenges. This article presents a case of successful root canal retreatment in a mandibular second molar exhibiting this complex configuration. Achieving a successful endodontic outcome in such cases necessitates a comprehensive understanding of the unique root canal anatomy. Moreover, the employment of advanced instruments and techniques is crucial to effectively address the intricacies of the C-shaped root canal system.