Imaging Science in Dentistry

Korean Academy of Oral and Maxillofacial Radiology (대한영상치의학회)
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Bone thickness of the infrazygomatic crest area in skeletal Class III growing patients: A computed tomographic study

  • Lee, Hyub-Soo (Department of Orthodontics, College of Dentistry and Research Institute of Oral Science, Gangneung-Wonju National University) ;
  • Choi, Hang-Moon (Department of Oral and Maxillofacial Radiology, College of Dentistry and Research Institute of Oral Science, Gangneung-Wonju National University) ;
  • Choi, Dong-Soon (Department of Orthodontics, College of Dentistry and Research Institute of Oral Science, Gangneung-Wonju National University) ;
  • Jang, Insan (Department of Orthodontics, College of Dentistry and Research Institute of Oral Science, Gangneung-Wonju National University) ;
  • Cha, Bong-Kuen (Department of Orthodontics, College of Dentistry and Research Institute of Oral Science, Gangneung-Wonju National University)
  • Received : 2013.04.28
  • Accepted : 2013.06.02
  • Published : 2013.12.31
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Abstract

Purpose: This study was performed to investigate the bone thickness of the infrazygomatic crest area by computed tomography (CT) for placement of a miniplate as skeletal anchorage for maxillary protraction in skeletal Class III children. Materials and Methods: CT images of skeletal Class III children (7 boys, 9 girls, mean age: 11.4 years) were taken parallel to the Frankfurt horizontal plane. The bone thickness of the infrazygomatic crest area was measured at 35 locations on the right and left sides, perpendicular to the bone surface. Results: The bone was thickest (5.0 mm) in the upper zygomatic bone and thinnest (1.1 mm) in the anterior wall of the maxillary sinus. Generally, there was a tendency for the bone to be thicker at the superior and lateral area of the zygomatic process of the maxilla. There was no clinically significant difference in bone thickness between the right and left sides; however, it was thicker in male than in female subjects. Conclusion: In the infrazygomatic crest area, the superior and lateral area of the zygomatic process of the maxilla had the most appropriate thickness for placement of a miniplate in growing skeletal Class III children with a retruded maxilla.

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