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2026. 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. 5, 2 (May 2026), 1371–1381. DOI:https://doi.org/10.66021/pakmcr971.