Document Detail

Quantification of external root resorption by low- vs high-resolution cone-beam computed tomography and periapical radiography: A volumetric and linear analysis.
MedLine Citation:
PMID:  23273363     Owner:  NLM     Status:  In-Data-Review    
INTRODUCTION: The goal of this study was to determine whether cone beam-computed tomography (CBCT) images with resolutions similar to those produced in orthodontic offices have sufficient resolution to accurately quantify root resorption defects.
METHODS: Teeth containing simulated root defects were scanned by microcomputed tomography (microCT) and CBCT at 0.2- and 0.4-mm resolutions and were radiographed by the periapical technique. Root length was measured with digital calipers. Comparisons were made to establish significance between imagining modalities and to compare defects of differing severity and position.
RESULTS: The mean absolute difference in volumetric measurements of lateral defects from 0.2-mm-resolution CBCT images compared with those from microCT images was significantly smaller than those from 0.4-mm-resolution CBCT images (0.20 ± 0.2 mm(3) vs 0.30 ± 0.3 mm(3); P = 0.002). A Bland-Altman analysis showed that the 95% limits of agreement range between low-resolution CBCT and microCT volumetric measurements was1.44-fold greater than that between high-resolution CBCT and microCT measurements (-0.87-0.68 vs -0.49-0.59 mm(3)). The accuracy of the volumetric measurements was also significantly influenced by defect size (P = 0.004 for high-resolution CBCT, P = 0.005 for low-resolution CBCT) and, on low-resolution scans, by the defect's vertical position (P = 0.012). Linear measurements of apical defects from both the 0.2- and 0.4-mm-resolution CBCT images were significantly more similar to the measurements made with digital calipers than the measurements from the periapical radiographs (P <0.0001 and P <0.0001, respectively).
CONCLUSIONS: Our results demonstrated that, compared with measurements from microCT images, high-resolution CBCT scans lead to more accurate volumetric quantifications of lateral resorption defects than do low-resolution scans. Both high- and low-resolution CBCT scans can also be used to more accurately measure external apical root resorption defects than periapical radiographs. Because these results are from CBCT scans of static images, measurements of root resorption defects from scans of patients will most likely be less accurate because of patient movement.
Stacy N Ponder; Erika Benavides; Sunil Kapila; Nan E Hatch
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Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  American journal of orthodontics and dentofacial orthopedics : official publication of the American Association of Orthodontists, its constituent societies, and the American Board of Orthodontics     Volume:  143     ISSN:  1097-6752     ISO Abbreviation:  Am J Orthod Dentofacial Orthop     Publication Date:  2013 Jan 
Date Detail:
Created Date:  2012-12-31     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  8610224     Medline TA:  Am J Orthod Dentofacial Orthop     Country:  United States    
Other Details:
Languages:  eng     Pagination:  77-91     Citation Subset:  D; IM    
Copyright Information:
Copyright © 2013 American Association of Orthodontists. Published by Mosby, Inc. All rights reserved.
Orthodontic resident, Department of Orthodontics and Pediatric Dentistry, School of Dentistry, University of Michigan, Ann Arbor, Mich.
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