POSSIBILITIES OF USING CONE-BEAM COMPUTED TOMOGRAPHY FOR SECOND MESIO-BUCCAL CANAL (MB2) IDENTIFICATION IN THE STRUCTURE OF THE FIRST MAXILLARY MOLARS
DOI:
https://doi.org/10.35220/2078-8916-2023-48-2.9Keywords:
endodontics, cone-beam computer tomography, second mesio-buccal canal, voxelAbstract
Purpose of the study. To estimate the prevalence of the second mesio-buccal canal (MB2) in the structure of the maxillary first molars according to the data obtained with cone-beam computed tomography (CBCT), as well as to establish the diagnostic significance of tomographic scans of different thicknesses for the verification of the MB2-canal. Research methods. The research plan included the analysis of 100 tomograms of dental patients, the studied objects in the structure of which were the first molars of the upper jaw on the left side. The analysis of the selected tomograms was carried out in the specialized software Planmeca Romexis® Viewer using the function of changing the thickness of the scans in the following gradation: 0,2 mm, 0,4 mm, 0,6 mm, 0,8 mm, 1,0 mm, 1,2 mm, 2,0 mm. In order to increase the verification possibilities of MB2, the standard positioning of the coordinate planes was changed, and the axes were displayed taking into account the peculiarities of the morphology of the mesiobuccal root of the maxillary upper molar on the left side (interactive positioning). Scientific novelty. A gradual increase in the thickness of the scans led to the following changes in the prevalence of MB2 verification in the structure of the studied tomograms sample: 0,2 mm – 68%, 0,4 mm – 62%, 0,6 mm – 56%, 0,8 mm – 52%, 1,0 mm – 50%, 1,2 mm – 44%, 2,0 mm – 30%. In relation to the initial amount of each age group, the highest frequency of MB2 verification was found for patients aged 25–44 years – 83,3%, in comparison with which the prevalence of second mesial-buccal canal identification was markedly lower in all other groups: 61,54% in age group of under 25 years, 64,10% in the age group 44–60 years and 41,66%% in the age group 60–75 years. Conclusions. According to the analysis of tomographic scans with a thickness of 0,2 mm, the prevalence of MB2 among dental patients of different age groups reaches 68%, characterized by a relatively equal frequency of diagnosis among men and women. An increase in the scan thickness from 0,2 mm to 2,0 mm provokes a 2.26-fold decrease in the diagnostic possibility of identifying the second mesiobuccal canal in the structure of the maxillary first molar. The presence of MB2 in one of the first molars of the maxilla according to the CBCT data is associated with a high chance of same canal presence within the structure of a symmetrical tooth.
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