Oshurko A. P., Oliinyk I. Yu., Kuzniak N. B.

MORPHOLOGY

Scentific article

Introduction. This study focuses on the topographic features of the mandibular canal in case of bone atrophy caused by the loss of the masticatory teeth. Taking as a goal to develop a simplified and informative classification of the topography of the human mandibular canal, available for implementation in daily clinical practice, we analysed 136 digital CT scans obtained using the Vatech PaX-i 3D Green extra-oral radiography system. Even at first glance, we already observed a difference in the laying of the canal relative to the buccal, lingual sides or the ridge of the mandibular base. Bone tissue acquires “unstable” atrophic manifestations in case of the loss of teeth, particularly the masticatory ones, with their inherent anatomical features of the roots and their location in the alveolar part. CT digital images were processed by the standardised X-ray diagnostic software Ez3D-I Original ver.5.1.9.0. Using the tools of the optional horizontal panel, in particular, the “profile” interface keys, a morphometric study of the topography of the mandibular canal on both the left and right sides was performed in projections of 3.7, 3.6, 4.6, 4.7 teeth. To study qualitatively homogeneous values, we used nonparametric methods of statistical analysis and mathematical calculation of the average (MM) morphometric parameters that characterise canal laying in toothless distal segments of atrophied bone tissue of the lower jaw. So, in the first study group, the distance from the ridge of the mandibular base to the mandibular canal (MC) is 7.2 mm, from the ridge of the buccal surface to the MC – 4.8 mm, the distance from the ridge of the lingual surface to the MC – 2.9 mm. In the second group of the study, RMB=8.0 mm, BR=5.3 mm, LR=3.3 mm regarding MC. In the third group of the study, RMB=8.1 mm, BR=5.3 mm, LR=3.3 mm relative to the mandibular canal. Systematic analysis, reduced to a simplified and understandable classification of the topography of the human mandibular canal with bone atrophy caused by the loss of the masticatory teeth, provides an opportunity to predict the diagnosis and clinical proposal in the choice of rehabilitation methods, with the immediate restoration of the lost function of the dentition, fixing screw periosteal splints, during osteosynthesis or other reconstructive operations, forensic medical examination, and the like.

morphometry, lower jaw canal, computed tomography

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«Bulletin of problems biology and medicine» Issue 2 Part 2 (165), 2022 year, 131-135 pages, index UDK 611.716.4:616.314.22.018.4-007.23

10.29254/2077-4214-2022-2-2-165-131-135