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Analysis of linear measurements on 3D surface models using CBCT data segmentation obtained by automatic standard pre-set thresholds in two segmentation software programs: an in vitro study

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Abstract

Objective

The aim of this in vitro study was to evaluate the reliability and accuracy of linear measurements on three-dimensional (3D) surface models obtained by standard pre-set thresholds in two segmentation software programs.

Materials and methods

Ten mandibles with 17 silica markers were scanned for 0.3-mm voxels in the i-CAT Classic (Imaging Sciences International, Hatfield, PA, USA). Twenty linear measurements were carried out by two observers two times on the 3D surface models: the Dolphin Imaging 11.5 (Dolphin Imaging & Management Solutions, Chatsworth, CA, USA), using two filters(Translucent and Solid-1), and in the InVesalius 3.0.0 (Centre for Information Technology Renato Archer, Campinas, SP, Brazil). The physical measurements were made by another observer two times using a digital caliper on the dry mandibles.

Results

Excellent intra- and inter-observer reliability for the markers, physical measurements, and 3D surface models were found (intra-class correlation coefficient (ICC) and Pearson’s r ≥ 0.91). The linear measurements on 3D surface models by Dolphin and InVesalius software programs were accurate (Dolphin Solid-1 > InVesalius > Dolphin Translucent). The highest absolute and percentage errors were obtained for the variable R1–R1 (1.37 mm) and MF–AC (2.53 %) in the Dolphin Translucent and InVesalius software, respectively.

Conclusion

Linear measurements on 3D surface models obtained by standard pre-set thresholds in the Dolphin and InVesalius software programs are reliable and accurate compared with physical measurements.

Clinical relevance

Studies that evaluate the reliability and accuracy of the 3D models are necessary to ensure error predictability and to establish diagnosis, treatment plan, and prognosis in a more realistic way.

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Conflict of interest

The authors declare that they have no conflict of interest.

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Authors and Affiliations

  1. Paraná Federal Institute of Education, Science and Technology, Rua João XXIII, 600 - Jardim Dom Bosco, Londrina, PR, 86060-370, Brazil

    Marcelo Lupion Poleti

  2. Department of Orthodontics, University of North Parana, Londrina, Paraná, Brazil

    Thais Maria Freire Fernandes & Marcela Rodrigues Moretti

  3. Department of Stomatology, Bauru Dental School, University of São Paulo, Bauru, São Paulo, Brazil

    Otávio Pagin & Izabel Regina Fischer Rubira-Bullen

Authors
  1. Marcelo Lupion Poleti
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  2. Thais Maria Freire Fernandes
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  3. Otávio Pagin
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  4. Marcela Rodrigues Moretti
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  5. Izabel Regina Fischer Rubira-Bullen
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Correspondence to Marcelo Lupion Poleti.

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Poleti, M.L., Fernandes, T.M.F., Pagin, O. et al. Analysis of linear measurements on 3D surface models using CBCT data segmentation obtained by automatic standard pre-set thresholds in two segmentation software programs: an in vitro study. Clin Oral Invest 20, 179–185 (2016). https://doi.org/10.1007/s00784-015-1485-5

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  • DOI: https://doi.org/10.1007/s00784-015-1485-5

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