American Journal of Orthodontics Dentofacial Orthopedics
Volume 143, Issue 1 , Pages 140-147, January 2013
Introduction
Digital 3-dimensional models are widely used for
orthodontic diagnosis. The aim of this study was to assess the validity,
reliability, and reproducibility of digital models obtained from the
Lava Chairside Oral scanner (3M ESPE, Seefeld, Germany) and cone-beam
computed tomography scans of alginate impressions for tooth-width
measurements and the Bolton analysis.
Methods
A digital
model, an intraoral scan, and a plaster model were made for each of 22
subjects. Tooth-width measurements on the digital model and the
intraoral scan were compared with those on the corresponding plaster
models (gold standard). Intraclass correlation coefficients were
calculated to determine the interexaminer reliability of the
measurements of each method. The anterior and overall Bolton ratios were
calculated for each participant and for each method. The paired
t test was used to determine the validity. The scanning time for the intraoral scanner was registered and analyzed.
Results
Tooth-width
measurements of each tooth on the digital models and the intraoral
scans did not differ significantly from those on the plaster models (
P >0.05).
The overall and anterior Bolton ratios from the 2 types of digital
models differed significantly from the gold standard (
P <0 .05=".05" 1.5="1.5" as="as" be="be" clinically="clinically" could="could" decreased="decreased" differences="differences" exceeded="exceeded" however="however" insignificant.="insignificant." intraoral="intraoral" mm="mm" never="never" number="number" of="of" p="p" performed.="performed." regarded="regarded" scanner="scanner" scanning="scanning" scans="scans" significantly="significantly" the="the" this="this" times="times" with="with">
Conclusions
Both
intraoral scanning and cone-beam computed tomography scanning of
alginate impressions are valid, reliable, and reproducible methods to
obtain dental measurements for diagnostic purposes.
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