Frequency and Pattern of 4th canal in permanent maxillary 1st molar Endodontic Department of Tertiary Care Hospital Khyber College of Dentistry Peshawar. Pjmcr [Internet]. 2026 May 9 [cited 2026 Jun. 25];5(2):1371-8. Available from: https://pakjmcr.com/index.php/1/article/view/971