Evaluation of CBCT digital models and traditional models using the Little's Index.
OBJECTIVE
To determine if measurements obtained from digital models from cone beam computed tomography (CBCT) images were comparable to the traditional method of digital study models by impressions.


METHODS
Digital models of 30 subjects were used. InVivoDental (Anatomage, San Jose, Calif) software was used to analyze CBCT scans taken by a Galileos cone beam scanner (Sirona, Charlotte, NC) with a field of view of 15 x 15 x 15 cm(3) and a voxel resolution of 0.125 mm. OrthoCAD (Cadent, Fairview, NJ) software was used to analyze impression scans of patients at different stages of orthodontic treatment. Impressions were taken using alginate and were mailed to OrthoCAD for digital conversion. The scans were then electronically returned in digital format for analysis.


RESULTS
The maxillary mean scores for the Little's Index were 9.65 mm for digital models and 8.87 mm for InVivoDental models, respectively. The mandibular mean scores for the Little's Index were 6.41 mm for digital models and 6.27 mm for InVivoDental models, respectively. The mean overjet measurements were 3.32 mm for digital models and 3.52 mm for InVivoDental models, respectively. The overbite measurements were 2.29 mm for digital models and 2.26 mm for InVivoDental models, respectively. The paired t-test showed no statistical significance between the differences in all measurements.


CONCLUSIONS
CBCT digital models are as accurate as OrthoCAD digital models in making linear measurements for overjet, overbite, and crowding measurements.
Kau
Chung How
CH
Department of Orthodontics, University of Texas Health Science Center at Houston, 77030, USA. chung.h.kau@uth.tmc.edu
Littlefield
Jay
J
Rainy
Neal
N
Nguyen
Jennifer T
JT
Creed
Ben
B
D000464:Alginates / Q000737:chemistry; D054893:Cone-Beam Computed Tomography / Q000295:instrumentation / Q000379:methods*; D003481:Cuspid / Q000473:pathology; D003760:Dental Impression Materials / Q000737:chemistry; D003761:Dental Impression Technique / Q000295:instrumentation; D006801:Humans; D007091:Image Processing, Computer-Assisted / Q000379:methods*; D021621:Imaging, Three-Dimensional / Q000379:methods; D007180:Incisor / Q000473:pathology; D008311:Malocclusion, Angle Class I / Q000145:classification; D008334:Mandible; D008437:Maxilla; D003765:Models, Dental; D012189:Retrospective Studies; D012984:Software
D000464:Alginates; D003760:Dental Impression Materials