Mandibular buccal shelf asymmetry and bone density in vietnamese adults: a CBCT study
Published Online: Sep 01, 2025
Page range: 275 - 283
Received: Apr 01, 2025
Accepted: Jun 01, 2025
DOI: https://doi.org/10.2478/aoj-2025-0026
Keywords
© 2025 Trung Nhu Nguyen et al., published by Sciendo
This work is licensed under the Creative Commons Attribution 4.0 International License.
Objectives
To assess using CBCT, the mandibular buccal shelf (MBS) bone thickness asymmetry and its relationship with cortical and cancellous bone density in Vietnamese adults presenting with Class I bimaxillary protrusion (Class I BP) and skeletal Class III malocclusions.
Materials and Methods
CBCT scans of 60 Vietnamese adults (30 Class I BP: 7 males, 23 females, mean age 27.63 years; 30 Class III: 15 males, 15 females, mean age 23.63 years) were analysed. Total bone thickness (dTB) was measured at 6, 9, and 12 mm below the cementoenamel junction at the mandibular first and second molars (R6G, R6X, R7G, R7X). Cortical (MĐV) and cancellous (MĐX) bone density were evaluated. Left-right asymmetry was tested using Wilcoxon or t-tests, and correlations were assessed using Spearman’s rho coefficient (
Results
Class I BP cases showed significant left-right asymmetry in dTB at R6G and R6X (e.g., R6G 6 mm: 1.57±0.93 mm vs. 2.25±1.38 mm,
Conclusions
A Class I BP malocclusion exhibited MBS asymmetry at R6G and R6X, unlike a symmetrical Class III malocclusion. No correlation between bone thickness and density suggested independent adaptations, aiding miniscrew placement in Vietnamese adults.