Age-related dynamics of the cortical plate thickness of the mandible in the area of the first and second primary molars: data from cone beam computed tomography
https://doi.org/10.51922/1818-426X.2026.2.87
Abstract
Mandibular cortical plate thickness is frequently cited as a factor limiting the efficacy of pulpal infiltration anesthesia. It is generally assumed that cortical thickness increases with more distal tooth positioning and advancing age in children; however, this assumption requires empirical validation.
Objective. To evaluate the buccal cortical plate thickness at the level of the distal root apex of the first and second primary molars in children aged 5, 6, 7, 8, 9, and 10 years using archived cone-beam computed tomography (CBCT) scans.
Materials and Methods. Archived CBCT scans of 81 children, divided into six age groups, were analyzed. Measurements were performed on 123 first and 152 second primary molars. Statistical analysis was conducted using non-parametric (Mann-Whitney U test, Spearman’s rank correlation) and parametric (Student’s t-test) methods.
Results. Cortical thickness values ranged from 1.3 mm to 2.10 mm (Mean ± SD = 1.85 ± 0.09 mm. No statistically significant differences were observed between the first and second primary molars in any age group. Notably, cortical thickness significantly decreased between the ages of 5 and 10 years in the regions of both the first (r = –0.74; p < 0.01) and second (r = –0.73; p < 0.01) molars.
Conclusions. According to CBCT data, the buccal cortical plate thickness at the root apices of the first and second primary molars does not differ significantly between children of the same age. Furthermore, this thickness decreases significantly in children during the period from 5 to 10 years of age.
About the Authors
T. V. Papruzhenka
Belarusian State Medical University
Belarus
Belarus
Minsk
U. O. Bykova
7th City Dental Clinic
Belarus
Belarus
Minsk
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Review
For citations:
Papruzhenka T.V., Bykova U.O. Age-related dynamics of the cortical plate thickness of the mandible in the area of the first and second primary molars: data from cone beam computed tomography. Medical Journal. 2026;(2):87-93. (In Russ.) https://doi.org/10.51922/1818-426X.2026.2.87
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