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The accuracy of panoramic radiography in the assessment of mesiodistal angulations of the teeth

Mahsa Molaee
Postgraduate Student, Dept. of Orthodontics, Dental School, Qazvin University of Medical Sciences
Hesam Mikaili Khiavi
Postgraduate Student, Dept. of OMFR, Tehran University of Medical Science
Hooriye Bashisaze
Assistant Professor, Dept. of OMFR, Tehran University of Medical Science

Objective:
Nowadays use of panoramic radiography for evaluation of uprighting and root parallelism, after the closure of spaces and before the debanding of fixed appliances, often been accepted, and the use of radiography to evaluate the results at the end of orthodontic treatment is discussed.
It is not clear whether panoramic radiography reflects the exact mesiodistal position of the maxilla and mandible tooth roots.
Despite of previous studies, still comprehensive studies on the subject, seems necessary.This study aims to determine the accuracy of panoramic radiography in the assessment of mesiodistal angulations of the teeth.
Methods & Materials:
We had 10 patients with class I molar relationships, and took an alginate impression from both jaws, then poured that with moldano plaster.
To determine the long axis of the teeth, orthodontic wires (0.7) Parallel to the long axis of the teeth, (on diagnostic casts) was used. To take a panoramic radiography from casts, Panoramic imaging device “Planmeca 2002 CC” with 4mA and 60kvp was used. Photo was taken from Casts and Panoramic radiographs, then the angles between the wires and the reference line, were measured by the Autocad 2005 software, and the values related to casts and panoramic radiographs, were compared.
Results:
Significant percentage of achieved angles of the panoramic images (71.2%), statistically, was not in the acceptable range (±2 degree).
Generally the lowest accuracy of panoramic radiography in assessment of mesiodistal angulation of the teeth was in the lower lateral incisor region.
( ICC=-0.237)
Also the differences between the actual angles and radiographic angles in maxilla, is considerably less than in mandible.
Conclusion:
Dentists should act cautiously in making clinical decisions for requirements of angle adjustments, according to panoramic radiograph findings.

Keywords:
Panoramic radiography, Root angulation


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محل نشر یا ارائه:  کنگره 10 انجمن ارتودنتیست ها
سال ایرانی :  1391
موضوع:  ارتودنسی
Level:  Postgraduate

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