Three-dimensional evaluation of the size and dimensional changes of the vomer bone in midfacial deficiency individuals


Thesis Type: Doctorate

Institution Of The Thesis: Marmara University, Institute of Health Sciences, Department of Oral and Maxillofacial Radiology, Turkey

Approval Date: 2017

Thesis Language: English

Student: AMMAR RIYAD MOHI MOHI

Supervisor: Şebnem Erçalık Yalçınkaya

Abstract:

 The aim of this study was 1) To evaluate the vomer bone shape and size changes in relation to midfacial deficiency features. 2) To determine the correlation between different cranial and midfacial skeletal parameters of the vomer bone in both linear and angular measurements. 3) To compare the 3D reconstructed vomer bone models of three groups. Material and Method: CBCT images of 96 patients with normal occlusion and Class III malocclusion were collected from the archive of Orthodontic Department, Faculty of Dentistry, Marmara University. The age of patients was between 16-30 years old. All images were classified into three groups using ANB angle Steiner's analysis: Normal (type A) group, Mild (type B) and Severe (type C) midfacial hypoplasia groups. Firstly, 13 skeletal points in cranial, midfacial and vomer region level were selected. The linear and angular reference planes were drawn for shape outline analysis and later the 3D reconstructed models of vomer bone size were measured using Mimics 19.0V software and data were statistically analyzed. Results: There were high significant differences between anterior variables (P< 0.01) followed by posterior variables (P<0.05) of the vomer bone with high positive correlation in linear and angular parameters in all planes of the severe group (type C) and it was higher in males than females. No statistical correlation within different age was found (P>0.01). The size of the 3D reconstructed model of the vomer bone was larger and had elongated pattern in severe group (type C) when compared to other groups (p<0.001). Conclusion: Based on the findings of this study, it was concluded that the vomer bone had an eventual role in preserving the midface contour of class III malocclusion midface complex in all planes.