Ces radiol. 2007, 61(3):321-326

Feasibility of multidetector-row CT in orthodonticsOriginal article

Jan Baxa1, Jiří Ferda1, Jiří Baumruk2, Jana Oulická2, Hana Bóhmová2, Anna Šváchová2, Boris Kreuzberg1
1 Radiodiagnostická klinika FN a LF UK. Plzeň
2 Stomatologická klinika FN a LF UK, Plzeň

Aim: The aim of the retrospective study presented here was to evaluate whether multidetector-row CT could improve the assessment and planning of orthodontic treatment.

Methods: 110 examinations were performed over a period of three years. 28 (25.5 %) of these were performed on a 16-row and 82 (74.5 %) on a 64-row CT. A dental protocol with partially reduced basic exposition parameters (120 kV, 90 eff.mAs) was used. We evaluated the shape, number and position of the teeth, as well as changes in the alveolar bone (bone resorption, etc.). During the post-processing, MPR reconstructions as well as 3D models using VRT were made.

Results: The most frequent finding was tooth impaction (99 impacted teeth in 52 patients); a majority of which were maxillary canines (50 impacted canines in 38 patients); 23 (23.2 %) of impacted teeth caused resorption of the surrounding bone; apical resorption of an adjacent tooth was found in 14 (14.1 %) cases. Suspected ankylosis of the impacted teeth was detected in 35 (35.4 %) of cases. The second largest group of findings involved abnormalities in the number (hypodontia - 8; 7.3 %, hyperodontia 9; 8.2 %) and position (transposition 6; 5.5 %) of the teeth and in final place came abnormalities of the structure and position of jawbones (7; 6.4 %). 33 (30 %) examinations were performed after surgical rapid palatinal expansion.

Conclusion: MDCT has proven accuracy and efficiency for improving assessment and treatment planning in orthodontics. An essential contribution was made by 3D imaging using VRT and also the evaluation of the detailed changes occurring in jaws using MPR.

Keywords: dental CT, multidetector-row CT, impacted teeth, orthodontics

Accepted: June 10, 2007; Published: September 1, 2007  Show citation

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Baxa J, Ferda J, Baumruk J, Oulická J, Bóhmová H, Šváchová A, Kreuzberg B. Feasibility of multidetector-row CT in orthodontics. Ces radiol. 2007;61(3):321-326.
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