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ORIGINAL RESEARCH ARTICLE
Year : 2018  |  Volume : 21  |  Issue : 2  |  Page : 169-174

Analysis of mandibular second molars with fused roots and shallow radicular grooves by using micro-computed tomography


1 Department of Operative Dentistry, Endodontics and Dental Materials, Bauru School of Dentistry, University of Sao Paulo, Bauru, Brazil
2 Department of Endodontics, Faculty of Dentistry, Estacio De Sa University, Rio De Janeiro, Rio De Janeiro, Brazil

Correspondence Address:
Dr. Pablo Amoroso-Silva
Faculdade de odontologia de Bauru - Universidade de São Paulo. Al. Octàvio Pinheiro Brisola no. 9-7517012-901 Bauru, SP
Brazil
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Source of Support: None, Conflict of Interest: None


DOI: 10.4103/JCD.JCD_74_18

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Aim: This study aimed to describe the morphological and morphometric aspects of fused mandibular second molars with radicular shallow grooves using micro-computed tomography (CT). Materials and Methods: Eighty-eight mandibular second molars with fused roots were scanned in a micro-CT scanner at a voxel size of 19.6 μm. After reconstruction, only molars without C-shaped roots and presenting shallow radicular grooves were selected. 30 molars were chosen for further analysis. Canal cross-sections were classified according to Fan's modified classification (C1, C2, C3, and C4) and morphometric parameters at the apical region, examination of accessory foramina and tridimensional configuration were evaluated. Results: Three-dimensional reconstructions indicated a higher prevalence of merging type (n = 22). According to Fan's modified classification, the C4 configuration was predominant in the 3 apical mm. Roundness median values revealed a more round-shaped canals at 3 mm (0.72) than at 2 (0.63) and 1 (0.61) mm from the apex. High values of major and minor diameters were observed in the canals of these evaluated sections. In addition, few accessory apical foramina were observed at 1 and 2 mm from the apex. The average distance between last accessory foramina and the anatomic apex was 1.17 mm. A less complex internal anatomy is found when a mandibular second molar presents fused roots with shallow radicular grooves. The merging type canal was frequently observed. Moreover, the C4 configuration was predominant at a point 3 mm from the apex and presented rounded canals, large apical diameters, and few accessory foramina. The cervical and middle thirds presented C3 and C1 canal configurations most frequently. Conclusion: A minor morphological complexity is found when fused mandibular second molars present shallow radicular grooves.


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