Evaluation of Root Morphology and Root Canal Configuration of Mandibular and Maxillary Premolar Teeth In Turkish Subpopulation By Using Cone Beam Computed Tomography

The aim of this study was to evaluate the root morphology and root canal configuration of the lower and upper premolars using cone-beam computed tomography (CBCT), according to gender and right-left position of the tooth in the Turkish subpopulation. For the evaluation of root canal anatomy of mandibular and maxillary premolar teeth, 494 patients were used. In total, 3,880 premolar teeth were evaluated. CBCT images were examined in the coronal, sagittal, and axial planes. Number of roots, canals, and canal configurations of the teeth were determined according to Vertucci's classification. Qualitative data were analysed with Chi-square, Fisher Exact, and Bonferroni tests (α=0.05%). According to the results of this study, in maxillary first premolars, 64.5% two roots, 87.7% two canals, and 67.8% Type Ⅳ canal configuration; in maxillary second premolars 77.3% one root, 50.4% one canal, and 50.4 Type Ⅰ canal configuration; in mandibular first premolars 89.9% one root, 76.9% one canal, and 76.9% Type Ⅰcanal configuration; and in mandibular second premolars 98.4% one root, 95.9% one canal, and 95.9% Type Ⅰcanal configuration were observed. No statistically significant effect of the tooth position (right, left) on the number of roots, canals, and canal configuration in maxillary and mandibular premolars was observed (p>0.05). Maxillary second premolar and mandibular first premolars showed a statistically significant effect on number of roots, canals, and canal configuration by gender (p=0.00, p=0.032). In addition, gender had a significant effect on number of roots in maxillary first premolars (p=0.017).

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