Ranjbarian, Parisa, Elsagh, Alireza , Torkzadeh, Azadeh, Taheri, Parisa . Prevalence of periapical periodontitis and its association with previous root canal treatment and, root canal obturation length –based on CBCT. Contemporary Orofacial Sciences . 2024;2(2):13-18. doi:10.71783/cofs.2024.1105072