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ORIGINAL RESEARCH
Year : 2021  |  Volume : 12  |  Issue : 4  |  Page : 193-196

Hard- and Soft-Tissue Cephalometric Landmark Detection when Using a Thyroid Lead Shield


1 Department of Orthodontics, School of Dentistry, Yasuj University of Medical Sciences, Yasuj, Iran
2 Department of Oral and Maxillofacial Radiology, School of Dentistry, Yasuj University of Medical Sciences, Yasuj, Iran
3 School of Dentistry, Yasuj University of Medical Sciences, Yasuj, Iran

Correspondence Address:
Roghayeh Panahi
Department of Oral and Maxillofacial Radiology, School of Dentistry, Yasuj University of Medical Sciences, Yasuj
Iran
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Source of Support: None, Conflict of Interest: None


DOI: 10.4103/denthyp.denthyp_110_21

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Introduction: The aim of this study was to assess the detection of some hard- and soft-tissue cephalometric landmarks when using a thyroid lead shield. Materials and Methods: Two study groups were designed, and each group consisted of 50 cephalograms: the first group was without thyroid shield cephalograms and the second group consisted of cephalograms taken using a lead thyroid shield. An observer blinded about the aim of the study was appointed to identify 12 landmarks on the lateral cephalograms. Results: Out of 12 of landmarks, 3 landmarks had a significant relationship with the thyroid shield group. Landmarks of cervical point, second and third vertebrae were not detected in 20%, 30%, and 66% of cases, respectively. Discussion: Two hard-tissue landmarks (second and third vertebrae) and one soft-tissue landmark (cervical point) were masked by the thyroid shield when preparing a cephalogram.


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