Evaluation of the reliability of measurements in cephalograms generated from cone beam computed tomography

Abstract

The measurements in the synthesized cephalograms proved to be reliable.

A comparative study of digital lateral radiography and virtual cone-beam computed assisted cephalogram in cephalometric measurements

“…As such all the images used in this study correspond to surgical patients with maxillofacial alterations of medium and high grade, clinically justifying undergoing CBCT imaging. Results obtained in this study agree with several others who also compared conventional cephalograms with those generated from CBCT and obtained an adequate reproducibility for both, such as Aksoy et al, 19 Da Silva et al, 20 Cattaneo et al, 22 Hariharan et al, 23 Cassetta et al, 24 Zamora et al, 25 among other. Nevertheless better accuracy for cephalograms obtained from CBCT was emphasized by Shokri et al, 26 who used dry skulls, the gold standard for measurements, and their results showed that the values obtained in CBCT cephalograms were much closer to the real measurements, and also mentioned it would be desirable that the diagnosis in orthodontics and treatment planning is based on CBCT scans, especially when decisions depend on precise linear measurements such as orthognathic surgery.…”

“…18 The distance SL presented statistically significant differences both in the first and in the second set of measurements when comparing the two types of image, which can be justified by the difficulty of locating the Pg point (necessary for this measurement), because it is on a curved surface so its location is not so easily reproducible 14 and generally these reference points are more associated with errors, 12 like point C1, which is identified to establish the distance SE, and which also presented statistically significant differences in the second set of measurements when comparing the two types of image. Results that can be compared with others regarding points in curved structures had lower reproducibility; thus, studies in which conventional radiographs were compared with cephalograms generated from CBCT such as Aksoy et al, 19 showed good reproducibility for most measures evaluated except for Co-Gn, Go-Me, SNA-Me, and Wits; Da Silva et al, 20 reported a CCI between 0.969 and 0.999 indicative of high reliability for most measurements except GoGn.SN and IMPA, which involved the Go point, and the linear measurements that involved the lips which presented a significant difference. The Pg to NB distance present a statistically significant difference when comparing the first and second set of measurements in radiographs, which could also be justified as stated by Tng et al, 21 that when the reference points are located in a curve such as point A, point B or Pg, the error is greater.…”

Ponticulus posticus in a cohort of orthodontic children and adolescent patients with different sagittal skeletal anomalies: a comparative cone beam computed tomography investigation

“…The ability to accurately evaluate skeletal rather than dental malocclusion is greater because the former is unaffected by caries, dental extractions, impaction and tooth-size conflicts. Furthermore, the anterior cranial base regions are stable after 7 years of age, meaning that they are considered to be reliable cranial-base cephalometric and skeletal landmark areas [2,35]. In the literature, previous studies were reported that there was correlation between cervical vertebrae anomalies and vertebrae morphology, craniofacial malformations, and skeletal malocclusions.…”

Digital orthodontic radiographic set versus cone-beam computed tomography: an evaluation of the effective dose

“…However, it was reported that the average distance between nasion and menton was 12.28 cm. 22 While a multiethnic population presents much more variation, anterior facial height may reach greater values than these ones. Therefore, to the reduced field of view, even in the extended field of view protocol, some essential structures may be cut out of the image obtained.…”