Purpose: This study outlines two-dimensional analysis of root canal orifices in maxillary second molars showing different types of root fusion.
Methods: A total of 150 extracted fused maxillary second molar teeth with mature roots free of fractures, or deep caries extending to root dentine, were scanned on a micro-CT device (SkyScan 1172, Bruker-microCT, Kontich, Belgium) at 9 µm (pixel size), 100 kV, 100 µA.
Results: The perimeter and area of MB2 canal orifice were statistically smaller than other orifices in all fusion types (p <.05). Major and minor diameter values of MB2 were also significantly smaller than that of MB in fusion types 1-to 4 (p <.05), apart from type 6, in which major and minor diameters of MB, MB2 and DB orifices were similar (p >.05).The largest area and perimeter values were measured in P canal orifice irrespective of fusion type (p <.05).
Conclusion: The fusion type does not affect the area and minor diameter of the canal orifices. All morphological parameters examined were found to be similar for MB and MB2 canal orifices regardless of the fusion type.