Journal of Conservative Dentistry
Home About us Editorial Board Instructions Submission Subscribe Advertise Contact e-Alerts Login 
Users Online: 626
Print this page  Email this page Bookmark this page Small font sizeDefault font sizeIncrease font size
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
Login to access the Email id

Source of Support: None, Conflict of Interest: None

DOI: 10.4103/JCD.JCD_74_18

Rights and Permissions

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.

Print this article     Email this article
 Next article
 Previous article
 Table of Contents

 Similar in PUBMED
   Search Pubmed for
   Search in Google Scholar for
 Related articles
 Citation Manager
 Access Statistics
 Reader Comments
 Email Alert *
 Add to My List *
 * Requires registration (Free)

 Article Access Statistics
    PDF Downloaded84    
    Comments [Add]    

Recommend this journal