الفهرس يوجد فقط 14 صفحة متاحة للعرض العام
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المستخلص
The retrospective study was conducted on CBCT scans of mandibular permanent first and second molars of a sample of the Egyptian population to assess the variations in the number of roots, root canals and root canal morphological variations. The scans were obtained from the data base available at the department of oral and maxillofacial radiology, faculty of dentistry, Cairo University, Egypt. A total of 384 mandibular first and second permanent molars from 169 CBCT scans were examined including 174 mandibular first molars and 210 mandibular second molars of 96 female patients and 73 male patients.The scans were viewed using Planmeca Romexis® Viewer and were analyzed in the 3 planes axial, coronal and sagittal planes.The data recorded and analyzed from the scans were the number of roots and root canals for each tooth, root canal type of the mesial root(s) and distal root(s) regardless of the number of roots, the relation between gender and any abnormalities and bilateral occurrence of extra roots, extra root canals and C-shaped roots in the bilateral scans. from the current study we can conclude that:Most of the mandibular first and second molars have two roots (86.2%) with a less prevalence of three roots (4.2%).C-shape root was found only in mandibular second molars with a frequency of (9.4%) of all molars included in the study.The highest prevalence was for two root canals in the mesial root of the mandibular first molars (73.6%) with type IV being the most frequent root canal configuration (46%) followed by type II (16.1%), and for the distal root we found most first molars with two root canals (55.7%) and type III root canal configuration (21.3%) followed by type V (17.2%)