Abstract
Proper superimposition of intraoral scan generated 3D models enables detailed assessment of soft and hard tissue surface changes. This requires accurate 3D models and stable structures as superimposition references. In the maxilla, different reference areas have been proposed, mostly located at the palatal region. In this in vivo study we evaluated the precision of two intraoral scanners (TRIOS 3, 3Shape and CS 3600, Carestream) at the maxilla, focusing on the palate itself and also on its spatial relation to the dentition, following palatal superimposition. Precision was tested through the superimposition of repeated scans on the palate and the dental arch. Overall, the median precision of both scanners was high (< 0.1 mm). Scanner precision was comparable when the palatal area was tested individually. However, TRIOS 3 showed higher precision regarding the assessment of the dental arch, following superimposition of repeated models on the palate (median difference: approximately 40 μm). In few cases, local areas of higher imprecision were present for both scanners, exceeding 0.3 mm. Thus, scanner precision seems to be high in small, but slightly reduced considering larger areas, with differences between scanners. However, the effect on individual tooth position relative to the palate was for both scanners limited.
Highlights
Proper superimposition of intraoral scan generated 3D models enables detailed assessment of soft and hard tissue surface changes
When superimpositions were performed on the whole dental arch, no significant difference was identified between the precision of the two scanners in palatal area B (Friedman test, p = 0.176; TRIOS 3 median: 0.0434 mm, range: 0.0170, 0.1377 mm; CS 3600 median: 0.0594 mm, range: 0.0191, 0.2321 mm) (Fig. 3)
When superimpositions were performed on palatal area mm dorsal to them (area A), precision was assessed at: a) the dental arch and b) palatal area A
Summary
Proper superimposition of intraoral scan generated 3D models enables detailed assessment of soft and hard tissue surface changes. Different reference areas have been proposed, mostly located at the palatal region In this in vivo study we evaluated the precision of two intraoral scanners (TRIOS 3, 3Shape and CS 3600, Carestream) at the maxilla, focusing on the palate itself and on its spatial relation to the dentition, following palatal superimposition. There is only one study that examined the performance of the soft tissue imaging in the palatal r egion[18], considering the spatial position of the palate relative to the dental arch. Another previous study tested the accuracy of the palatal region relative to the alveolar processes, but it was in vitro and concerned edentulous p atients[19]. The study aimed to assess scanner precision on the spatial position of the dentition relative
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