Restor Dent Endod.  2022 Feb;47(1):e6. 10.5395/rde.2022.47.e6.

Morphological characteristics of the mesiobuccal root in the presence of a second mesiobuccal canal: a micro-CT study

• Rosado LPL
• Oliveira ML
• Rovaris K
• Freitas DQ
• Neves FS

• KMID: 2548115
• DOI: http://doi.org/10.5395/rde.2022.47.e6

Abstract

Objectives
This study investigated the internal morphology of mesiobuccal (MB) roots of maxillary molars with a second mesiobuccal (MB2) canal.
Materials and Methods
Forty-seven maxillary first or second molars from Brazilians were scanned using micro-computed tomography. The following measurements were obtained from the MB roots: root thickness, root width, and dentin thickness of the buccal aspect of the first mesiobuccal (MB1) canal, between the MB1 and MB2 canals, and the palatal aspect of the MB2 and MB1 canals at 3 mm from the root apex and in the furcation region. For statistical analysis, the Student’s t-test and analysis of variance with the post-hoc Tukey test were used (α = 0.05).
Results
In maxillary molars with an MB2 canal, MB roots were significantly thicker (p = 0.0014) and narrower (p = 0.0016) than in maxillary molars without an MB2 canal. The dentin thickness of the palatal aspect of the MB1 canal was also significantly greater than that of MB roots without an MB2 canal at 3 mm from the root apex (p = 0.0007) and in the furcation region (p < 0.0001). In the furcation region of maxillary molars with an MB2 canal, the dentin thickness between the MB1 and MB2 canals was significantly smaller than that in the buccal and palatal aspects (p < 0.0001).
Conclusions
The internal morphology of MB roots of maxillary molars with an MB2 canal revealed differences in dentin thickness, root diameter, and distance between the canals when compared with maxillary molars without an MB2 canal.

Keyword

Anatomy; Maxillary molar; Mesiobuccal root; Micro-computed tomography; Root canal

Figure

• 

  Figure 1 Cropped micro-CT axial sections at 3 mm from the apex of the mesiobuccal root with (upper row) and without an MB2 canal (lower row). For better visualization, the same root is shown in triplicate. (a) Root thickness, (b) Root width, (c) MB1 buccal segment, (d) MB1-MB2 segment, (e) MB2 palatal segment, (f) MB1 palatal segment.CT, computed tomography; MB, mesiobuccal.

• 

  Figure 2 Cropped axial sections of measurements taken from the furcation region of maxillary molars with an MB2 canal (A) and without an MB2 canal (B). (c) MB1 buccal segment, (d) MB1-MB2 segment, (e) MB2 palatal segment, (f) MB1 palatal segment.MB, mesiobuccal.

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