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Applications of Cone-Beam Computed Tomography in Orthodontics


Zahra Shakibaei
Assistant Professor , Dept. of Oral and Maxillofacial Radiology, Dental School , Hamadan University of Medical Science


Comprehensive visualization and records of the craniofacial complex have been goals in orthodontic imaging. These tasks have been performed by means of plaster, photographs and radiographs. A combination of volumetric reconstruction and multiplanar views can provide the orthodontic clinician with skeletal hard tissue, soft tissue, dentition, and airway information. Nonstandard orthodontic cases, such as impacted teeth, supernumerary odontomas, or unexpected radiologic observations, such as pathologic lesions or incidental findings are best visualized with the 3-dimensinoal CBCT scan.
With Cone Beam CT imaging, a more comprehensive orthodontic diagnosis and more accurate treatment planning is possible by allowing for:
•3D views of vital structures and  limits of tooth movement
CBCT imaging puts the clinician in a much better position than does conventional imaging to evaluate eruption patterns and their variations. for example a cross-sectional view of the incisors can reveal the vertical dimension of bone apical to the maxillary central incisors and the limited space for intrusion.
•3D evaluation of impacted tooth position , anatomy and dental development
•TMJ assessments of condylar anatomy in three dimensions
•Orthognathic surgery treatment planning and growth assessments in true 1:1 imaging
•Airway assessments
Perhaps as a result of the lack of diagnostic instruments in this area, the focus on patient airway assessment seems to have subsided until CBCT arrived and aided in the evaluation of airways and relationship between airway disorders and malocclusion.
•Planning for placement of dental implants for tooth restoration or orthodontic anchorage and for placement of temporary anchorage devices (TADs)
•Assessment skeletal symmetry or asymmetry , craniofacial morphology
There are no magnification issues with CBCT.
•Superimposition:
Recently, a method for superimposition of CBCT images that does not first require segmentation or landmark selection was developed that is accurate, fast and automatic
Conclusion:
CBCT offers advantages for imaging in orthodontics. Use the lower dose in orthodontics to capture dramatically more information in detailed 3D images while managing radiation dose, Capture precisely accurate 3D views to analyze teeth, roots, TMJ, airway, and sinuses without magnification or distortion, Impressionless models enhance accuracy while saving time, labor and space in the modern dental practice. With just one click, create 3D cephalometric analysis that also yields full traditional 2D analysis. Research and development of future applications of CBCT, such as simulation, growth prediction, forensics, modeling and manufacturing, is ongoing


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محل نشر یا ارائه:  کنگره 10 انجمن ارتودنتیست ها
سال ایرانی :  1391
موضوع:  ارتودنسی
Level:  Postgraduate

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