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Outdoing best-fit approaches for the manufacturing accuracy evaluation of complete denture bases

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Abstract

To compare the reference geometry approach to the best-fit (or superimposition) approach in the estimation of geometric accuracy relevant to the digital and the analog workflow to fabricate a complete denture. Starting from a model of an edentulous maxilla, the two measuring methodologies were tested to estimate the geometric accuracy of the intaglio surface of the complete dentures fabricated by CNC milling and injection molding. Eight areas of interest were defined at the intaglio surface of the denture base; a sensitivity analysis determined the minimum number of measuring points to calculate a reliable \({\overline{\Delta }}\) error value. A repeatability analysis was performed to assess the consistency of this experimental reference geometry approach with respect to the clinic acceptable requirements. For the analog workflow, the comparison of the reference geometry results to the best-fit results showed a − 76 (post-dam) ÷ 169 µm (right flange) range of the \({\overline{\Delta }}\) mean value for the reference geometry approach, to be compared to − 15 (left crest) ÷ 146 µm (right tuberosity) range for the best-fit approach. For the digital workflow, the same comparison showed a − 21 (left crest) ÷ 51 µm (left flange) range for the reference geometry approach, compared to a − 20 (left crest) ÷ 23 µm (left flange) for the best-fit approach. The best-fit approach results in an underestimation of mean \({\overline{\Delta }}\) error values and their distribution over the entire prosthesis. The reference geometry approach correctly estimates error values while focusing on the identification of sources of errors in the manufacturing process.

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Authors and Affiliations

  1. Department of Biomedical and Neuromotor Science, Alma Mater Studiorum University of Bologna, Via S. Vitale 59, 40125, Bologna, Italy

    Leonardo Ciocca, Valerio Cimini & Lorenzo Breschi

  2. Department of Management and Engineering, University of Padova, Stradella San Nicola 3, 36100, Vicenza, Italy

    Mattia Maltauro & Roberto Meneghello

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  1. Leonardo Ciocca
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  2. Mattia Maltauro
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  3. Valerio Cimini
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  4. Lorenzo Breschi
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  5. Roberto Meneghello
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Correspondence to Mattia Maltauro.

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Ciocca, L., Maltauro, M., Cimini, V. et al. Outdoing best-fit approaches for the manufacturing accuracy evaluation of complete denture bases. Int J Interact Des Manuf 17, 1389–1397 (2023). https://doi.org/10.1007/s12008-022-01162-y

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  • DOI: https://doi.org/10.1007/s12008-022-01162-y

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