Assessment of the Interradicular Space in Panoramic Radiograph in Comparison to Computed Tomography
Joo Euk, 권선미, 유형석, 이기준,
소속 상세정보
( Joo Euk ) - Yonsei University College of Dentistry Department of Orthodontics
권선미 ( Kwon Sun-Mi ) - Yonsei University College of Dentistry Department of Orthodontics
유형석 ( Yu Hyung-Seog ) - Yonsei University College of Dentistry Department of Orthodontics
이기준 ( Lee Kee-Joon ) - Yonsei University College of Dentistry Department of Orthodontics
KMID : 1149920180070010001
Abstract
Purpose: It is important to minimize the dental root injury when applying orthodontic mini-implant in interradicular space. Distance between roots shown in panoramic radiographs is used as a reference in usual clinical practice, but panoramic radiograph has limitation of magnification and distortion. Thus, this research attempted to provide information of the magnification and distortion in panoramic radiograph for safe mini-implant placement by measuring and comparing the interradicular space in panoramic radiographs and CT scans, as well as by analyzing the pattern of magnification and distortion in panoramic radiographs.
Materials & Methods: CT scans and panoramic radiographs were taken on 30 maxillas and mandibles. Interradicular distances at 4 mm and 8 mm away from the cemento-enamel junction (CEJ) toward the apex and crown widths were measured. The interradicular distance was defined by measuring from the center of lamina dura.
Results: Based on panoramic radiograph, the magnification of crown width was generally consistent with a measure of 1.1 in anterior and 1.3 in posterior in both the maxilla and mandible. Magnification of interradicular distance in the anterior region was larger than the posterior region in both the maxilla and mandible, and the distortion was the largest in between the maxillary canine and first premolar region.
Conclusion: The panoramic radiograph can be used effectively in interradicular mini-implant placement recognizing the magnification rate. However, care must be taken when placing mini-implants in between the maxillary canine and first premolar region where the distortion is especially large.
키워드
Orthodontic mini-implant; Panoramic radiograph; CT; Interradicular space
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