Geometric Morphology Analysis of Bonwill Triangle in Liaoning Han Nationality Adults Based on EDMA

doi:10.13701/j.cnki.kqyxyj.2021.03.012

Abstract

Abstract: Objective: To measure the geometric shape of the Bonwill triangle of the mandible after 3D reconstruction and to analyze the differences of diverse vertical bone face shapes of the Bonwill triangle. Methods: The study involved the performance of 128-slice spiral CT scans on 72 Han adults in Liaoning and input these CT data into Invivo 5.3 for 3D reconstruction and 3D coordinate measurement of landmarks. WinEDMA 1.0.1 was used to analyze the differences between 3D landmarks. Bootstrap non-parametric test was used to analyze the result. Results: It was found that the Bonwill triangle of each bone face type of Liaoning Han adult had symmetry. However, the differences between each vertical bone face type were significant (P<0.05). The depth of the left faces of Liaoning Han adults decreased in the order of the average angle type to the high angle type, then to the low angle type. The depth of the right faces of the Liaoning Han adults decreased in the order of the high angle type to the average angle type, then to the low angle type. The widths of the mandibular condyles of Liaoning Han adults' faces decreased in the order of the low angle type to the high type, and then to the average angle type. Conclusion: The research provides a theoretical basis for the craniofacial features of vertical bone-face types in different regions.

Key words: Bonwill triangle, geometric morphometry, Euclidean distance matrix analysis, three-dimensional reconstruction

YIN Yanan, LIU Dahua, XU Zejun, REN Fu. Geometric Morphology Analysis of Bonwill Triangle in Liaoning Han Nationality Adults Based on EDMA[J]. Journal of Oral Science Research, 2021, 37(3): 237-241.

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