A micro‐computed tomographic study of band‐shaped root canal isthmuses, having their floor in the apical third of mesial roots of mandibular first molars

Aim To conduct a quantitative and qualitative analysis of the band‐shaped isthmus area, the floor of which was in the apical third in the mesial roots of mandibular first molars using micro‐computed tomography (micro‐CT). Methodology Micro‐CT images of 269 mesial roots of mandibular first molars wer...

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Bibliographic Details
Published in:International endodontic journal 2018-02, Vol.51 (2), p.240-246
Main Authors: Keleş, A., Keskin, C.
Format: Article
Language:English
Subjects:
Computed tomography
Data processing
Dental Pulp Cavity - anatomy & histology
Dental Pulp Cavity - diagnostic imaging
Dental roots
Dentistry
Endodontics
Humans
isthmus
Mandible
micro‐computed tomography
Molar - diagnostic imaging
Molars
root canal anatomy
Root canals
Statistical analysis
Teeth
Tooth Apex - anatomy & histology
Tooth Apex - diagnostic imaging
X-Ray Microtomography
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Summary:Aim To conduct a quantitative and qualitative analysis of the band‐shaped isthmus area, the floor of which was in the apical third in the mesial roots of mandibular first molars using micro‐computed tomography (micro‐CT). Methodology Micro‐CT images of 269 mesial roots of mandibular first molars were evaluated, and 40 specimens with a band‐shaped isthmus, with a floor in the apical third, were selected. The major diameter, minor diameter, roundness, area and perimeter values for the most coronal and apical slices where the isthmus was visible were measured. The distances between these slices were measured as the isthmus length, and the total volume, structure model index and surface area of the isthmus were measured. The distances between the isthmus floor and two apical foramina and the number of root canal orifices were calculated. The dimensions of the isthmus roof and the floor were compared, and the data were analysed using descriptive statistics and Student's t‐tests with a significance threshold set at 5%. Results A total of 15% of the specimens had band‐shaped isthmuses with a floor in the apical third. The isthmus roof exhibited significantly greater major and minor diameter values compared to the isthmus floor (P  0.05). Conclusion Three‐ and two‐dimensional analyses of the mesial roots of mandibular molars revealed that band‐shaped isthmuses had complex shapes.
ISSN:0143-2885
1365-2591
DOI:10.1111/iej.12842