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Do hydrothermal aging and microwave sterilization affect the trueness of milled, additive manufactured and injection molded denture bases?

Authors
  • Wemken, Gregor1
  • Spies, Benedikt Christopher2
  • Pieralli, Stefano3
  • Adali, Ufuk4
  • Beuer, Florian4
  • Wesemann, Christian4
  • 1 Department of Prosthodontics, Geriatric Dentistry and Craniomandibular Disorders, Charité - Universitätsmedizin Berlin, Corporate Member of Freie Universität Berlin, Humboldt-Universität zu Berlin and Berlin Institute of Health, Assmanshauser Str. 4-6, 14197, Berlin, Germany; Medical Center - University of Freiburg, Center for Dental Medicine, Department of Prosthetic Dentistry, Freiburg, Germany, Hugstetter Str. 55, 79106, Freiburg, Germany. , (Germany)
  • 2 Medical Center - University of Freiburg, Center for Dental Medicine, Department of Prosthetic Dentistry, Freiburg, Germany, Hugstetter Str. 55, 79106, Freiburg, Germany. Electronic address: [email protected] , (Germany)
  • 3 Medical Center - University of Freiburg, Center for Dental Medicine, Department of Prosthetic Dentistry, Freiburg, Germany, Hugstetter Str. 55, 79106, Freiburg, Germany. , (Germany)
  • 4 Department of Prosthodontics, Geriatric Dentistry and Craniomandibular Disorders, Charité - Universitätsmedizin Berlin, Corporate Member of Freie Universität Berlin, Humboldt-Universität zu Berlin and Berlin Institute of Health, Assmanshauser Str. 4-6, 14197, Berlin, Germany. , (Germany)
Type
Published Article
Journal
Journal of the mechanical behavior of biomedical materials
Publication Date
Jul 23, 2020
Volume
111
Pages
103975–103975
Identifiers
DOI: 10.1016/j.jmbbm.2020.103975
PMID: 32781402
Source
Medline
Keywords
Language
English
License
Unknown

Abstract

Concepts for digital denture manufacturing are market-available but studies comparing the trueness of such dentures, either milled (MIL) or additive manufactured, compared to injection molded (IM) ones are still limited. Regarding the impact of artificial aging and microwave sterilization on this parameter, no data are available. Therefore, the purpose of this investigation was to assess the trueness of IM, MIL, and stereolithography (SLA) printed denture bases after manufacturing, hydrothermal cycling, and microwave sterilization. Sixteen edentulous maxillary plaster models were poured using a silicone mold and digitized by means of a desktop scanner. For group IM, 16 denture bases were injection molded using these models. For group MIL and SLA, the denture bases were virtually designed and manufactured referring to the digitized data. A total of 48 samples were scanned 1) after manufacturing, 2) after hydrothermal cycling (5-55 °C, N = 5,000), and after 3) three as well as 4) six cycles of microwave sterilization for 6 min each at 640 W. The 3D surface deviation of the total intaglio surface, the palate, the alveolar ridge, and the border seal region was evaluated on the basis of the root mean square estimation (RMSE) and positive and negative mean deviations with an inspection software. For statistical analysis, ANOVA and post hoc Tukey tests were performed (α = 0.05). MIL showed the lowest deviations of the total RMSE (P ≤ .006) compared with the scans of the plaster models. In comparison, IM showed increased, mainly positive, deviations (P = .006) at the border seal. SLA presented the highest total RMSE (P = .001) with increased negative deviations, likewise at the border seal. In contrast to SLA (P = .001), no differences between IM and MIL (P = .816) were measured after hydrothermal cycling. Following microwave sterilization, the trueness of SLA was higher compared to IM and MIL (P = .001), with no differences between MIL and IM (P = .153). Distortion of IM and MIL was measured after the 3rd cycle with no further changes observed thereafter (P ≥ .385). It can be concluded, that subtractive manufacturing of denture bases results in the highest trueness, followed by IM and SLA. In contrast to IM and SLA, hydrothermal cycling did not affect MIL. Solely SLA printed denture bases remained dimensionally stable after microwave sterilization. Copyright © 2020 Elsevier Ltd. All rights reserved.

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