Frequency and Pattern of 4th canal in permanent maxillary 1st molar Endodontic Department of Tertiary Care Hospital Khyber College of Dentistry Peshawar. Pakistan Journal of Medical & Cardiological Review, [S. l.], v. 5, n. 2, p. 1371–1381, 2026. DOI: 10.66021/pakmcr971. Disponível em: https://pakjmcr.com/index.php/1/article/view/971. Acesso em: 10 aug. 2026.