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. 2019 Aug;47(8):3613-3622.
doi: 10.1177/0300060519853927. Epub 2019 Jun 20.

Sagittal discrepancies of the jaw in a Bangladeshi cohort: three-dimensional computed tomography analysis

Mushrath Islam  1 , Ayman Hameed Uraibi  2 , Arkan Al Azzawi  3 , Mohammad Khursheed Alam  4 , Asilah Yusof  5
Affiliations

Sagittal discrepancies of the jaw in a Bangladeshi cohort: three-dimensional computed tomography analysis

Mushrath Islam et al. J Int Med Res. 2019 Aug.

Abstract

Objectives: In orthodontic diagnosis and treatment planning, the assessment of skeletal jaw relationships is an essential step. This study aimed to evaluate skeletal jaw relationships in a Bangladeshi cohort by using traditional (ANB angle and Wits appraisal) and newly described (Beta angle, W angle, and Yen angle) sagittal measurements in three-dimensional (3D) computed tomography (CT).

Methods: The radiology department conducted CT scans of Bangladeshi patients. Mimics 3D imaging software (Materialise) was used to process the CT images and evaluate 3D sagittal measurements. SPSS software (IBM) was used to assess significant differences in the data at a confidence level of 5%. Independent-samples t-tests were used to evaluate sexual dimorphism for the measured values.

Results: In total, 85 men and 32 women were included in this study. All measurements were equivalent to the existing standards. There were no significant differences in the acquired values between men and women. Measurements were consistent with Class I normal classification.

Conclusions: This study established 3D CT standards for ANB, Wits appraisal, Beta angle, W angle, and Yen angle in Bangladeshi patients.

Keywords: ANB angle; Beta angle; Computed tomography; W angle; Wits appraisal; Yen angle; sagittal discrepancy.

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Figures

Figure 1.
Figure 1.
Overall workflow for conversion of two-dimensional (2D) images to three-dimensional (3D) images in Mimic software. (a) Segmentation and changes in the orientation of the computed tomography data. (b) Application of threshold technique in Mimic software. (c) Application of region growing to choose only the region of interest. (d) Conversion of CT images from 2D to 3D by using calculate 3D tool. (e) Mimics software enables 2D axial, sagittal, and coronal views, as well as 3D reconstruction of images. Measurements were performed on 3D images with the aid of other 2D views.
Figure 2.
Figure 2.
Three-dimensional computed tomography analyses performed in the sagittal plane: ANB angle, Wits appraisal, Beta angle, W angle, and Yen angle. Abbreviations: N, Nasion; S, Sella; A, Point A; B, Point B; C, Point C; G, Point G; OP, occlusal plane.
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