Root canal isthmi and interorifice distance in human permanent teeth of an Indian subpopulation using cone.beam computed tomography: A retrospective cross-sectional study

Velmurugan Natanasabapathy; Parashar Saumya Rajesh; MC V. Ashritha; Anisha Mishra; Ambalavanan Namasivayam; Deivanayagam Kandaswamy; Manali Ramakrishanan Srinivasan

doi:10.4103/JCD.JCD_576_20

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ORIGINAL ARTICLE

Year : 2020 | Volume : 23 | Issue : 6 | Page : 563-570

Root canal isthmi and interorifice distance in human permanent teeth of an Indian subpopulation using cone.beam computed tomography: A retrospective cross-sectional study

Velmurugan Natanasabapathy¹, Parashar Saumya Rajesh¹, MC V. Ashritha¹, Anisha Mishra¹, Ambalavanan Namasivayam², Deivanayagam Kandaswamy³, Manali Ramakrishanan Srinivasan⁴
¹ Department of Conservative Dentistry and Endodontics, Faculty of Dentistry, Meenakshi Ammal Dental College and Hospital, Meenakshi Academy of Higher Education and Research, Chennai, Tamil Nadu, India
² Department of Periodontology and Oral Implantology, Faculty of Dentistry, Meenakshi Ammal Dental College and Hospital, Meenakshi Academy of Higher Education and Research, Chennai, Tamil Nadu, India
³ Department of Conservative Dentistry and Endodontics, Faculty of Dental Sciences, Sri Ramachandra Institute of Higher Education and Research, Chennai, Tamil Nadu, India
⁴ Department of Conservative Dentistry and Endodontics, Sri Venkateswara Dental College and Hospital, Chennai, Tamil Nadu, India

Correspondence Address:
Dr. Velmurugan Natanasabapathy
Department of Conservative Dentistry and Endodontics, Faculty of Dentistry, Meenakshi Academy of Higher Education and Research University, No. 1, Alapakkam Main Road, Maduravoyal, Chennai - 600 095, Tamil Nadu
India

Source of Support: None, Conflict of Interest: None

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DOI: 10.4103/JCD.JCD_576_20

Objective: The aim of the study was to evaluate the prevalence of root canal isthmus (RCI) and measure the interorifice distance (IOD) between the root canals. Additionally to correlate IOD with the RCI in human permanent teeth using cone-beam computed tomography (CBCT) in an Indian sub-population (Chennai). Materials and Methods: A total of 5881 teeth from 280 CBCT full mouth scans were analyzed. The presence or absence of complete and incomplete RCI of each tooth was identified using the map-reading strategy. IOD was calculated by measuring the distance between the center of each root canal orifice to that of the center of the adjacent orifice at the level of the cementoenamel junction using the axial and sagittal sections. Chi-square analysis and correlation statistics using Spearman's rank-order test was done (P < 0.05). Results: High prevalence of RCI was found in maxillary first premolars, mesial root of mandibular molars, and mesiobuccal root of maxillary first molars, while its prevalence was low in maxillary canines and mandibular premolars and absent in maxillary incisors. RCI was predominantly seen in the cervical and middle third of the root canal in all the teeth evaluated. A weak negative correlation was established between the IOD and RCI for maxillary premolars, whereas a weak positive correlation was seen in maxillary first molars and mandibular second molars. Conclusion: The prevalence of RCI was high in the posterior teeth in comparison to the anterior teeth in the present study. There was no strong correlation between IOD and RCI in all the teeth evaluated.

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Cone-beam computed tomography; dental anatomy; human permanent teeth; isthmus; root canal system

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