Advertisement
Journal of Prosthetic Dentistry

Accuracy of a titanium maxillary complete denture baseplate fabricated by using the electron beam melting technique: An in vitro study

Published:September 22, 2021DOI:https://doi.org/10.1016/j.prosdent.2021.08.004

      Abstract

      Statement of problem

      Electron beam melting (EBM) is a promising additive manufacturing technique for fabricating denture baseplates; however, studies evaluating its accuracy are sparse.

      Purpose

      The purpose of this in vitro study was to compare the fit accuracy of titanium maxillary complete denture baseplates fabricated by using the EBM technique with those fabricated by using the conventional casting technique and to evaluate the dimensional accuracy of the EBM baseplate by using a 3-dimensional inspection software program.

      Material and methods

      Definitive casts of an edentulous maxilla were prepared. After the casts were optically scanned, computer-aided designs for the EBM baseplate were created by using a software program for standard tessellation language file editing. The EBM baseplates were fabricated with an EBM machine by using a Grade II titanium powder as the raw material. The cast baseplates were fabricated with a lost-wax casting technique by using refractory casts duplicated from the definitive casts. After fitting the EBM and cast baseplates to their corresponding definitive cast, they were embedded in a Type IV stone. The embedded baseplates on the casts were sectioned at 3 regions: posterior palatal seal, molar, and premolar. The maximum gaps between the baseplate and definitive cast were measured in these 3 regions. The virtual casts obtained by scanning the EBM baseplate were superimposed on the computer-aided design to evaluate the dimensional accuracy. Distribution color maps were then generated, and the mean absolute deviations and root mean square deviations were calculated. One-way analysis of variance and t tests were used for statistical analysis (α=.05).

      Results

      No significant differences in the maximum gaps among the 3 regions were found in the cast or EBM baseplate groups (P>.05). The EBM baseplate group showed significantly lower values than the cast baseplate group in all regions (premolar: P=.008; molar: P=.003; posterior palatal seal: P=.004). The mean maximum gap for the 3 regions in the cast baseplates was 168.0 μm and that in the EBM baseplates was 60.7 μm. The distribution color map of the EBM baseplate showed a favorable dimensional accuracy. The mean absolute deviation value was 19.7 μm, and the root mean square deviation value was 25.1 μm.

      Conclusions

      The EBM baseplates had a significantly higher fit accuracy than the cast baseplates. Thus, the fit accuracy of the EBM technique is suitable for fabricating metal baseplates.
      To read this article in full you will need to make a payment

      Purchase one-time access:

      Academic & Personal: 24 hour online accessCorporate R&D Professionals: 24 hour online access
      One-time access price info
      • For academic or personal research use, select 'Academic and Personal'
      • For corporate R&D use, select 'Corporate R&D Professionals'

      Subscribe:

      Subscribe to Journal of Prosthetic Dentistry
      Already a print subscriber? Claim online access
      Already an online subscriber? Sign in
      Institutional Access: Sign in to ScienceDirect

      References

        • Van Noort R.
        The future of dental devices is digital.
        Dent Mater. 2012; 28: 3-12
        • Arnold C.
        • Hey J.
        • Schweyen R.
        • Setz J.M.
        Accuracy of CAD-CAM-fabricated removable partial dentures.
        J Prosthet Dent. 2018; 119: 586-592
        • Alharbi N.
        • Wismeijer D.
        • Osman R.B.
        Additive manufacturing techniques in prosthodontics: where do we currently stand? A Critical Review.
        Int J Prosthodont. 2017; 30: 474-484
        • Lee J.W.
        • Park J.M.
        • Park E.J.
        • Heo S.J.
        • Koak J.Y.
        • Kim S.K.
        Accuracy of a digital removable partial denture fabricated by casting a rapid prototyped pattern: a clinical study.
        J Prosthet Dent. 2017; 118: 468-474
        • Revilla-León M.
        • Meyer M.J.
        • Özcan M.
        Metal additive manufacturing technologies: literature review of current status and prosthodontic applications.
        Int J Comput Dent. 2019; 22: 55-67
        • Forrester K.
        • Sheridan R.
        • Phoenix R.D.
        Assessing the accuracy of casting and additive manufacturing techniques for fabrication of a complete palatal coverage metal framework.
        J Prosthodont. 2019; 28: 811-817
        • Ye Y.
        • Jiao T.
        • Zhu J.
        • Sun J.
        Adaptation and micro-structure of Co-Cr alloy maxillary complete denture base plates fabricated by selective laser melting technique.
        Lasers Med Sci. 2018; 33: 1025-1030
        • Soltanzadeh P.
        • Suprono M.S.
        • Kattadiyil M.T.
        • Goodacre C.
        • Gregorius W.
        An in vitro investigation of accuracy and fit of conventional and CAD/CAM removable partial denture frameworks.
        J Prosthodont. 2019; 28: 547-555
        • Ye H.
        • Ning J.
        • Li M.
        • Niu L.
        • Yang J.
        • Sun Y.
        • et al.
        Preliminary clinical application of removable partial denture frameworks fabricated using computer-aided design and rapid prototyping techniques.
        Int J Prosthodont. 2017; 30: 348-353
        • Chen H.
        • Li H.
        • Zhao Y.
        • Zhang X.
        • Wang Y.
        • Lyu P.
        Adaptation of removable partial denture frameworks fabricated by selective laser melting.
        J Prosthet Dent. 2019; 122: 316-324
        • Tasaka A.
        • Shimizu T.
        • Kato Y.
        • Okano H.
        • Ida Y.
        • Higuchi S.
        • et al.
        Accuracy of removable partial denture framework fabricated by casting with a 3D printed pattern and selective laser sintering.
        J Prosthodont Res. 2020; 64: 224-230
        • Mercelis P.
        • Kruth J.-P.
        Residual stresses in selective laser sintering and selective laser melting.
        Rapid Prototyping J. 2006; 12: 254-265
        • Knowles C.R.
        • Becker T.H.
        • Tait R.B.
        Residual stress measurements and structural integrity implications for selective laser melted TI-6AL-4V.
        South Afr J Ind Eng. 2012; 23: 119-129
        • Wu A.S.
        • Brown D.W.
        • Kumar M.
        • Gallegos G.F.
        • King W.E.
        An experimental investigation into additive manufacturing-induced residual stresses in 316L stainless steel.
        Metall Mat Trans A Phys Metall Mat Sci. 2014; 45: 6260-6270
        • Shiomi M.
        • Osakada K.
        • Nakamura K.
        • Yamashita T.
        • Abe F.
        Residual stress within metallic model made by selective laser melting process.
        CIRP Ann Manuf Technol. 2004; 53: 195-198
        • Bhavar V.
        • Kattire P.
        • Patil V.
        • Khot S.
        • Gujar K.
        • Singh R.
        Additive manufacturing handbook: product development for the defense industry.
        1st ed. Bharat Forge, Pune2017: 251-261
        • Steinmassl O.
        • Dumfahrt H.
        • Grunert I.
        • Steinmassl P.A.
        CAD/CAM produces dentures with improved fit.
        Clin Oral Investig. 2018; 22: 2829-2835
        • Vayre B.
        • Vignat F.
        • Villeneuve F.
        Identification on some design key parameters for additive manufacturing: application on electron beam melting.
        Procedia CIRP. 2013; 7: 264-269