Comparative study on protrusion and width of zygomatic bones between patients with maxillary retrusion and normal subjects
10.3760/cma.j.cn114453-20241205-00313
- VernacularTitle:上颌后缩患者和正常人群颧骨突度和宽度的比较研究
- Author:
Shuhao LIU
1
;
Zhe LI
;
Kai TAO
Author Information
1. 中国医科大学附属口腔医院口腔颌面影像诊断科，沈阳 110001
- Publication Type:Journal Article
- Keywords:
Zygoma;
Maxilla;
Maxillary retrusion;
Three-dimensional McNamara cephalometric analysis;
Spiral CT
- From:
Chinese Journal of Plastic Surgery
2025;41(5):473-479
- CountryChina
- Language:Chinese
-
Abstract:
Objective:To focus on the comparison of protrusion and width in zygomatic bones between the patients with the maxillary retrusion and normal subjects, in order to explore the relationship between maxillary retrusion and protrusion and width of zygomatic bones.Methods:DICOM data of spiral CT in craniomaxillofacial region were collected from the database of Department of Radiology, the Affiliated Hospital of Stomatology, China Medical University from January 2020 to July 2023. The study group included patients with maxillary retrusion and mandibular protrusion. The control group included the normal people with Angle’s Class Ⅰ occlusion. The three-dimensional(3D) images of craniofacial skeletons were built with ProPlan CMF 2.0 Software. The 3D-McNamara cephalometric analysis based on the coronal plane (CP) containing midpoint of the nasofrontal suture (N) were carried out for the anterior-posterior linear distances to the coronal plan of the maxillary alveolar base point (A-CP), the anterior-posterior linear distances of the landmark points of zygomatic bones (zygomatic protrusion), and for the width of the same landmark points on the left and right sides. The normal distribution measurement data were expressed as Mean±SD. The independent sample t-test was carried out between the same measurements of the two groups. In order to prove the relationship between the protrusion of maxilla and zygoma, the test of Pearson’s correlation analysis was carried out between the A-CP and the zygomatic landmarks of the orbital point of frontal-malar suture (Fmo-CP), the lowest point on the margin of the orbital (Or-CP), the most protrusive and front point of zygomatic bone (Mp-CP), and the lowest point of zygomatic-maxillary suture (Zm-CP). Results:A Total of 37 patients with maxillary retrusion were collected for study group (male 21, female 16, mean age of 21.1±3.2) and 33 normal subjects for control group (male 14, female 19, mean age of 21.1±2.5). The Mp-CP and the Zm-CP in the study group were significantly smaller than those in the control group ( P<0.05). Pearson’s correlation test showed that Mp-CP and Zm-CP were positively correlated with A-CP in the two groups ( r=0.38-0.49, P<0.05). But the horizontal width of zygomatic bones between the two groups did not show significant differences ( P>0.05). The ratio between the width of the lowest point of the zygomatic-temporal suture (Ztl) and the width of temporal points of frontal-malar suture (Fmt) was 1.21. Conclusion:The lower parts of zygomatic bones below the frontal-malar suture in patients with maxillary retrusion are affected by development of maxillary bones in sagittal direction and keep a positive relationship with the protrusion of maxillary bones. The zygomatic bone width of patients with maxillary retrusion is not affected by the sagittal development state of maxillary bones.
