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Evaluating mandibular symphysis bone density according to various skeletal patterns with CBCT.
Jay Gousman1, Jae Hyun Park1,2, Jong-Moon Chae1,3
1Postgraduate Orthodontic Program, Arizona School of Dentistry and Oral Health, A.T. Still University, Mesa, Arizona, USA.
Orthodontics & Craniofacial Research
|June 30, 2020
Summary
Bone density in the mandibular symphysis varies significantly with skeletal patterns. Females generally show higher bone density than males, with specific landmarks like the menton (Me) revealing the most pronounced differences.
Area of Science:
- Dentistry and Oral Health
- Radiology and Imaging
Background:
- Cone-beam computed tomography (CBCT) is crucial for assessing bone density (BD) in the mandibular symphysis.
- Understanding variations in mandibular symphysis BD across different skeletal patterns is essential for orthodontic and surgical planning.
Purpose of the Study:
- To evaluate bone density (BD) at the mandibular symphysis based on horizontal and vertical skeletal patterns using CBCT.
- To identify specific landmarks and skeletal types associated with significant differences in mandibular symphysis bone density.
Main Methods:
- Retrospective analysis of 319 untreated adults' CBCT images.
- Conversion of CBCT to lateral cephalometric images for skeletal pattern categorization.
- Measurement of cortical and cancellous bone density at key mandibular symphysis landmarks (B point, pogonion, genion, menton).
Main Results:
- Females exhibited higher bone density (BD) than males at the menton (Me), pogonion (Pog), and genion (Ge).
- Hyperdivergent and normovergent skeletal patterns showed significantly higher cortical BD at the menton (Me) compared to hypodivergent patterns.
- Class II skeletal patterns displayed significantly higher cortical BD at Me and Ge compared to Class I and III patterns.
Conclusions:
- Significant differences in mandibular symphysis bone density exist across various skeletal patterns.
- Landmarks such as Me, B point, and Ge showed statistically significant BD variations, with Me being the most sensitive.
- These findings highlight the importance of considering skeletal morphology when evaluating mandibular symphysis bone density.
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