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Home > Medicine & Health Science textbooks > Medical specialties, branches of medicine > Dentistry > Oral and maxillofacial surgery > Three-Dimensional Comparison of the Upper Airway in Various Types of Dentofacial Deformities
Three-Dimensional Comparison of the Upper Airway in Various Types of Dentofacial Deformities

Three-Dimensional Comparison of the Upper Airway in Various Types of Dentofacial Deformities


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About the Book

This dissertation, "Three-dimensional Comparison of the Upper Airway in Various Types of Dentofacial Deformities" by Mei-man, Chong, 臧薇敏, was obtained from The University of Hong Kong (Pokfulam, Hong Kong) and is being sold pursuant to Creative Commons: Attribution 3.0 Hong Kong License. The content of this dissertation has not been altered in any way. We have altered the formatting in order to facilitate the ease of printing and reading of the dissertation. All rights not granted by the above license are retained by the author. Abstract: Objectives 1. To define the normative airway of Chinese population using three-dimensional imaging and computer analysis 2. To evaluate the upper airway differences in patients with normal facial profile and those with skeletal class III deformity 3. To evaluate the differences in upper airway models among patients with different dentofacial deformities and describe the role of computational fluid dynamics (CFD) in the human upper airway Materials and Methods Part I: Three-Dimensional Analysis of the Normative Upper Airway in Chinese This was a cross-sectional observational study. Cone beam computerized tomography (CBCT) scans of one hundred patients were analyzed. Computer analysis of the different upper airway parameters were studied including airway length and volume, as well as airway dimensions at the axial level of the soft palate, hard palate, base of tongue, and epiglottis. The most constricted airway location was identified and correlation analysis with variables of interest was done. Part II: A Cone Beam Computerized Tomography Study of Airway in Skeletal Class I and Class III Cone-beam computed tomography (CBCT) records of 200 patients were used to evaluate the upper airway dimensions. This sample consisted of patients with normal facial profile (Class I) and those demonstrating skeletal class III deformities. Computer analysis of the upper airway parameters such as airway length, airway volume, airway anterior-posterior and cross-sectional area dimensions at the hard palate, soft palate, base of tongue and epiglottis were performed. The most constricted airway sites were identified. Part III: Computational fluid dynamics study of upper airway in different dentofacial deformities Cone-beam computed tomography records of 12 patients were used to evaluate the upper airway. This sample consisted of facial skeletal Class I, II and III subjects. The upper airway models were constructed to allow CFD simulations in the airway from the epiglottis to the hard palate. Cross-sectional area, pressure, velocity and resistance were measured based on the reconstructed meshed models. Results Part I: Three-Dimensional Analysis of the Normative Upper Airway in Chinese In 100 subjects (40 males, 60 females) aged 16-40 years with normal facial profile, we found that the most constricted site occurs at the level of the soft palate. This surface area of this site was found to be linearly correlated to the airway volume, suggesting a significant relationship between the most constricted area and the total airway volume. Gender differences were found in airway length, volume, and in the dimensions at the base of tongue and epiglottis region. The mean airway length was 54.12 mm + 6.19 for males and 49.25 mm + 4.86 for females; airway volume of 15.09 cm3 + 4.92 for males and 13.12 cm3 + 4.72 for females. Part II: A Cone Beam Computerized Tomography Study of Airway in Skeletal Class I and Class III The sample consisted of 100 Class I (41 males, 59 females) with a mean age of 25.4 years and 100 Class III (38 males, 62 females) with a mean age of 23.5 years. Gender differences were noted in the airway length, airway volume and dimensions at the base of tongue and epiglottis for both groups. Males showed longer airway length, larger airway volume, larger airway dimensions at the base of tongue and epiglottis co


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Product Details
  • ISBN-13: 9781361303313
  • Publisher: Open Dissertation Press
  • Publisher Imprint: Open Dissertation Press
  • Height: 279 mm
  • No of Pages: 56
  • Weight: 431 gr
  • ISBN-10: 136130331X
  • Publisher Date: 26 Jan 2017
  • Binding: Hardback
  • Language: English
  • Spine Width: 6 mm
  • Width: 216 mm


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