en رادیولوژی دهان فک صورت Oral & Maxillofacial Radiology پژوهشي Research <div style="text-align: justify;"><span style="font-size:12px;"><span style="line-height:200%"><span new="" roman="" times=""><strong><span style="line-height:200%">Background:</span></strong><span style="line-height:200%"> There is considerable diversity in the number and shape of canals in each root, the number of roots, and the </span>occurrence of root fusion in permanent maxillary premolars. This study aimed to investigate the morphology of the root and root canal of the first and second maxillary premolars using <span style="color:black">Cone Beam Computed Tomography.</span><b> </b><b><span dir="RTL" lang="AR-SA"><span style="line-height:200%"><span style="color:black"></span></span></span></b></span></span><br> <span style="line-height:200%"><span new="" roman="" times=""><strong><span style="line-height:200%">Materials and Methods: </span></strong><strong><span style="line-height:200%"><span style="font-weight:normal">This descriptive-analytical study included 109 CBCT samples from patients referred to the radiology department at the Faculty of Dentistry, Islamic Azad University of Isfahan. The number of roots, the number of canals, and canal structure were identified and evaluated using Vertucci&#39;s classification. Data were analyzed using Chi-square and Fisher&#39;s exact tests (&alpha;=0.05).</span></span></strong><span style="line-height:200%"></span></span></span><br> <span style="line-height:200%"><span new="" roman="" times=""><strong><span style="line-height:200%">Results:</span></strong><span style="line-height:200%"> In the first maxillary premolar, 71.6% of the teeth had two roots, while in the second premolar, 89.2% of the teeth had one root. Most teeth had two canals in the first maxillary premolar (98.6%) and a single canal in the second maxillary premolar (67.7%). Type IV was the most common canal structure in the first maxillary premolars, while type I was the most prevalent type in the second maxillary premolars. The greatest root curvature in both the first and second premolars was straight in the mesiodistal and buccolingual directions. There was a significant difference in the mesiodistal direction in the first premolar (P=0.038) and the second premolar (P=0.001), as well as in the number of canals (P=0.001) and canal type (P=0.01) in the second premolar regarding gender, while no differences were observed in other cases between males and females.</span></span></span><br> <span style="line-height:200%"><span new="" roman="" times=""><strong><span style="line-height:200%">Conclusion:</span></strong><span style="line-height:200%"> The number of roots and canals, and the type of canal, differed between the first and second premolars; however, in the mesiodistal and buccolingual directions, the first and second premolars were similar. There was no significant difference in the number of roots or buccolingual direction between the first and second premolars, nor in the number of canals or canal type of the first premolar by gender. In contrast, significant differences were observed in the mesiodistal direction of the first and second premolars and in the number of canals and canal type of the second premolar.</span></span></span></span></div> <br> &nbsp; 36 44 http://cofs.khuisf.ac.ir/browse.php?a_code=A-10-1-74&slc_lang=en&sid=1 Fatemeh Aminimanesh 10031947532846001239 10031947532846001239 No Department of Oral & Maxillofacial Radiology, Faculty of Dentistry, Isf.c, Islamic Azad University, Isfahan, Iran Azadeh Torkzadeh 10031947532846001240 10031947532846001240 Yes Department of Oral & Maxillofacial Radiology, Faculty of Dentistry, Isf.c, Islamic Azad University, Isfahan, Iran Amin Mortaheb 10031947532846001241 10031947532846001241 No Hamed Hajimokhtari 10031947532846001242 10031947532846001242 No Department of Oral & Maxillofacial Radiology, Faculty of Dentistry, Isf.c, Islamic Azad University, Isfahan, Iran