Reproducibility of radiographs with the Orthopantomograph 5: Tooth-length assessment

Larheim, Tore A.; Svanaes, D B; Johannessen, S

doi:10.1016/0030-4220(84)90045-8

Cited by 57 publications

(38 citation statements)

References 9 publications

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“…17,29,30 Habets et al 10 concluded that the headholder must be fixed well to the orthopantomograph, and the head has to be well centered in the headholder of the orthopantomograph when a clinical orthopantomograph is to be evaluated. In this study, all the films were taken in ideal conditions and inadequate or poor quality films were excluded.…”

Section: Discussionmentioning

confidence: 99%

Mandibular Asymmetry in Class II Subdivision Malocclusion

Kurt

Uysal

Şişman

et al. 2008

The Angle Orthodontist

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Objective: To evaluate the condylar and ramal mandibular asymmetry in a group of patients with Class II subdivision malocclusion to identify possible gender differences between male and female subjects. Materials and Methods: Mandibular asymmetry measurements (condylar, ramal, and condylarplus-ramal asymmetry values) were performed on the panoramic radiographs of 80 subjects (34 male and 46 female). The study group consisted of 40 Class II subdivision patients (18 male and 22 female; mean age 14.53 Ϯ 3.14 years). The control group consisted of 40 subjects with normal occlusion (16 male and 24 female; mean age 14.43 Ϯ 3.05 years). The Kruskal-Wallis test was used to determine the possible statistically significant differences between the groups for condylar, ramal, and condylar-plus-ramal asymmetry index measurements. Identified differences between groups were further analyzed using the Mann-Whitney U-test at the 95% confidence interval (P Ͻ .05). Results: No gender-related difference was found for any of the asymmetry indices. Comparison of condylar, ramal, and condylar-plus-ramal asymmetry index values and gonial angle measurements for Class I and Class II sides in the Class II subdivision group and for right and left sides in the Class I group showed no statistically significant differences. However, the Class II subdivision group has longer values for condylar, ramal, and condylar-plus-ramal height measurements and only these differences were statistically significant (P Ͻ .001). Conclusions: Except for condylar ramal and condylar-plus-ramal height measurements, Class II subdivision patients have symmetrical condyles when compared to normal occlusion samples according to Habbet's mandibular asymmetry indices.

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Section: Discussionmentioning

confidence: 99%

Mandibular Asymmetry in Class II Subdivision Malocclusion

Kurt

Uysal

Şişman

et al. 2008

The Angle Orthodontist

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“…Many authors suggest that the reproducibility of vertical and angular measurements is acceptable provided that the patient's head is positioned properly in the equipment. [32][33][34] In the present study, special attention was given to the positioning of the subjects during exposure, and the films with distorted and/or poor quality were excluded.…”

Section: Discussionmentioning

confidence: 99%

Condylar Asymmetry in Bilateral Posterior Crossbite Patients

Kiki

Kılıç

Oktay

2007

The Angle Orthodontist

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Objective:To investigate whether patients with bilateral posterior crossbite have asymmetrically developed condyles. Materials and Methods:The study group consisted of 75 patients with bilateral posterior crossbite, and a control group of 75 subjects with normal occlusion. Condylar, ramal, and condylar plus ramal asymmetry values were computed for all of the subjects on orthopantomograms. Data were analyzed statistically by means of paired t-test and Student's t-test. Results: The patients with bilateral posterior crossbite had more asymmetrical condyles relative to the controls. However, there were no statistically significant differences in condylar, ramal, or condylar plus ramal heights between left and right sides in both the control and crossbite groups. Conclusion: Patients with bilateral posterior crossbite can have asymmetrical condyles and might be at risk for the development of future skeletal mandibular asymmetries.

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“…Different authors state that horizontal measurements on panoramic radiographs are not particularly reliable due to a non-linear variation in the magnification of the objects found at different depths or as a result of the change in the central angle to compensate for the curvature, in this case of the mandible (Larheim et al;Laster et al, 2005). However, the results of this study show that although there is greater variability in the magnification or minimization, the reliability is high or very high because the value of CCC is above 0.8.…”

Section: Discussionmentioning

confidence: 99%

“…Horizontal and vertical measurements are reliable as long as they do not cross the median plane of the body and are made on only one side (Catic et al, 1998). The horizontal distances are non-reliable as a result of the change in the central angle with which the X-rays are directed upon the curved part of the mandible, whereas the vertical measurements have an adequate precision (Larheim et al, 1984).…”

Section: Introductionmentioning

confidence: 99%

Quantification by Quadrants of the Distortion Present in Conventional Panoramic Radiograph

Zúñiga

2017

Int. J. Morphol.

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ZÚÑIGA, J. Quantification by quadrants of the distortion present in conventional panoramic radiograph. Int. J. Morphol., 35(1):265-272, 2017. SUMMARY:The panoramic radiograph constitutes the "gold standard" for any clinical evaluation in dentistry. It has been universally accepted that it has a global distortion of 25 % due to magnification. The present study was carried out to determine more precise percentages of distortion, and to find out whether the distortion was due to magnification or minimization. Thirty skulls with their mandibles were divided by two horizontal and four vertical planes in ten quadrants. Wires of different lengths were fixed in each of these quadrants. A panoramic radiograph was taken for each skull. The lengths of the wires measured in the images (distorted value) were compared to the actual lengths of the wires (real value). The concordance correlation coefficient was calculated. Due to high bone density, in the upper lateral quadrants (1 and 5) no measurements could be obtained. In the intermediate upper quadrants (2 and 4) and in the median lower quadrant (8), the horizontal measurements were minimized, while in the intermediate inferior quadrants (7 and 9) and in the lateral inferior quadrants (6 and 10), the horizontal measurements were magnified. In both the upper and the lower quadrants (2, 3, 4, 6, 7, 8, 9, 10) all the vertical measurements were magnified. The percentage of distortion in each quadrant for the horizontal and vertical measurements was reported. The percentage of distortion in a panoramic radiograph of the face varies from one region to another and can be due to either magnification or minimization.

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Reproducibility of radiographs with the Orthopantomograph 5: Tooth-length assessment

Cited by 57 publications

References 9 publications

Mandibular Asymmetry in Class II Subdivision Malocclusion

Mandibular Asymmetry in Class II Subdivision Malocclusion

Condylar Asymmetry in Bilateral Posterior Crossbite Patients

Quantification by Quadrants of the Distortion Present in Conventional Panoramic Radiograph

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