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Journal of Prosthetic Dentistry

Evaluation of the accuracy of digital and 3D-printed casts compared with conventional stone casts

Published:December 08, 2020DOI:https://doi.org/10.1016/j.prosdent.2020.08.039

      Abstract

      Statement of problem

      Digital scans present an efficient substitute for traditional dental impressions, although physical casts are still needed for some procedures, leading to the use of 3D printing in fixed prosthodontics. However, studies comparing the accuracy of 3D-printed dental casts with digital and conventional casts are sparse.

      Purpose

      The purpose of this in vitro study was to compare the accuracy of casts produced from 2 different intraoral scans using a stereolithographic (SLA) 3D- printing technique, their digital versions, and conventional stone casts with a reference cast and with each other.

      Material and methods

      A reference cast was scanned by using 2 intraoral scanners, the TRIOS 3Shape and the Dental Wings, producing 2 digital scans. SLA was used to print dental casts from the digital scans, and polyether impressions were poured in dental stone to produce conventional stone casts. Measurements of the 4 types of casts (TRIOS 3Shape digital, Dental Wings digital, TRIOS 3Shape printed, and Dental Wings–printed casts) were compared with the reference casts. Measurements of maxillary and mandibular canines, second premolars, and second molars included incisocervical or occlusocervical (crown height) and mesiodistal (crown width). Arch measurements included intercanine and intermolar widths. The Geomagic imaging software program was used to measure the digital casts. ANOVA was used to assess differences among groups in errors relative to the reference cast (α=.05).

      Results

      In occlusocervical and mesiodistal, the errors of digital Dental Wings were significantly greater than the errors of the other 4 groups. For intercanine and intermolar widths, digital TRIOS 3Shape and digital Dental Wings had significantly greater errors (mean=0.11 and 0.15 mm in intercanine width and 0.14 and 0.18 mm in intermolar width) than their printed counterparts and the conventional casts (means=0.02, 0.06, and 0.01 mm in intercanine width and 0.02, 0.04, and 0.01 mm in intermolar width). The digital Dental Wings cast had significantly greater errors than those of the other groups in all measurements. All errors were within the clinically acceptable level (<0.5 mm).

      Conclusions

      3D-printed casts had the lowest error rate relative to the reference cast and were similar to those of conventional stone casts. Digital casts had the greatest errors.
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      References

        • van Noort R.
        The future of dental devices is digital.
        Dent Mater. 2012; 28: 3-12
        • Kumar A.
        • Ghafoor H.
        Rapid prototyping: a future in orthodontics.
        J Orthod Res. 2016; 4: 1
        • Jeon J.H.
        • Jung I.D.
        • Kim J.H.
        • Kim H.Y.
        • Kim W.C.
        Three-dimensional evaluation of the repeatability of scans of stone models and impressions using a blue LED scanner.
        Dent Mater J. 2015; 34: 686-691
        • Jin S.J.
        • Kim D.Y.
        • Kim J.H.
        • Kim W.C.
        Accuracy of dental replica models using photopolymer materials in additive manufacturing: in vitro three-dimensional evaluation.
        J Prosthodont. 2019; 28: e557-e562
        • Salmi M.
        • Paloheimo K.S.
        • Tuomi J.
        • Wolff J.
        • Mäkitie A.
        Accuracy of medical models made by additive manufacturing (rapid manufacturing).
        J Craniomaxillofac Surg. 2013; 41: 603-609
        • Flügge T.V.
        • Schlager S.
        • Nelson K.
        • Nahles S.
        • Metzger M.C.
        Precision of intraoral digital dental impressions with iTero and extraoral digitization with the iTero and a model scanner.
        Am J Orthod Dentofacial Orthop. 2013; 144: 471-478
        • Yoon J.H.
        • Yu H.S.
        • Choi Y.
        • Choi T.H.
        • Choi S.H.
        • Cha J.Y.
        Model analysis of digital models in moderate to severe crowding: in vivo validation and clinical application.
        Biomed Res Int. 2018; 2018: 8414605
        • Jeong I.D.
        • Lee J.J.
        • Jeon J.H.
        • Kim J.H.
        • Kim H.Y.
        • Kim W.C.
        Accuracy of complete-arch model using an intraoral video scanner: an in vitro study.
        J Prosthet Dent. 2016; 115: 755-759
        • Czarnota J.
        • Hey J.
        • Fuhrmann R.
        Measurements using orthodontic analysis software on digital models obtained by 3D scans of plaster casts.
        J Orofac Orthop. 2016; 77: 22-30
        • Camardella L.T.
        • Breuning H.
        • de Vasconcellos Vilella O.
        Accuracy and reproducibility of measurements on plaster models and digital models created using an intraoral scanner.
        J Orofac Orthop. 2017; 78: 211-220
        • Naidu D.
        • Freer T.J.
        Validity, reliability, and reproducibility of the iOC intraoral scanner: a comparison of tooth widths and Bolton ratios.
        Am J Orthod Dentofacial Orthop. 2013; 144: 304-310
        • Wiranto M.G.
        • Engelbrecht W.P.
        • Tutein Nolthenius H.E.
        • van der Meer W.J.
        • Ren Y.
        Validity, reliability, and reproducibility of linear measurements on digital models obtained from intraoral and cone-beam computed tomography scans of alginate impressions.
        Am J Orthod Dentofacial Orthop. 2013; 143: 140-147
        • El-Zanaty H.M.
        • El-Beialy A.R.
        • Abou El-Ezz A.M.
        • Attia K.H.
        • El-Bialy A.R.
        • Mostafa Y.A.
        Three-dimensional dental measurements: an alternative to plaster models.
        Am J Orthod Dentofacial Orthop. 2010; 137: 259-265
        • Kasparova M.
        • Grafova L.
        • Dvorak P.
        • Dostalova T.
        • Prochazka A.
        • Eliasova H.
        • et al.
        Possibility of reconstruction of dental plaster cast from 3D digital study models.
        Biomed Eng Online. 2013; 12: 49
        • Rossini G.
        • Parrini S.
        • Castroflorio T.
        • Deregibus A.
        • Debernardi C.L.
        Diagnostic accuracy and measurement sensitivity of digital models for orthodontic purposes: a systematic review.
        Am J Orthod Dentofacial Orthop. 2016; 149: 161-170
        • Groth C.
        • Kravitz N.D.
        • Shirck J.M.
        Incorporating three-dimensional printing in orthodontics.
        J Clin Orthod. 2018; 52: 28-33
        • Horton H.M.I.
        • Miller J.R.
        • Gaillard P.R.
        • Larson B.E.
        Technique comparison for efficient orthodontic tooth measurements using digital models.
        Angle Orthod. 2010; 80: 254-261
        • Hazeveld A.
        • Huddleston Slater J.J.R.
        • Ren Y.
        Accuracy and reproducibility of dental replica models reconstructed by different rapid prototyping techniques.
        Am J Orthod Dentofacial Orthop. 2014; 145: 108-115
        • Kim S.-Y.
        • Shin Y.-S.
        • Jung H.-D.
        • Hwang C.-J.
        • Baik H.-S.
        • Cha J.-Y.
        Precision and trueness of dental models manufactured with different 3-dimensional printing techniques.
        Am J Orthod Dentofacial Orthop. 2018; 153: 144-153
        • Webb P.A.
        A review of rapid prototyping (RP) techniques in the medical and biomedical sector.
        J Med Eng Technol. 2000; 24: 149-153
        • Ender A.
        • Mehl A.
        Accuracy of complete-arch dental impressions: a new method of measuring trueness and precision.
        J Prosthet Dent. 2013; 109: 121-128
        • Stansbury J.W.
        • Idacavage M.J.
        3D printing with polymers: challenges among expanding options and opportunities.
        Dent Mater. 2016; 32: 54-64
        • Yan C.
        • Shi Y.
        • Yang J.
        • Liu J.
        Multiphase polymeric materials for rapid prototyping and tooling technologies and their applications.
        Compos Interfaces. 2010; 17: 257-271
        • Whitaker M.
        The history of 3D printing in healthcare.
        Bull R Coll Surg Engl. 2014; 96: 228-229
        • Keating A.P.
        • Knox J.
        • Bibb R.
        • Zhurov A.I.
        A comparison of plaster, digital and reconstructed study model accuracy.
        J Orthod. 2008; 35: 191-201
        • Murugesan K.
        • Anandapandian P.A.
        • Sharma S.K.
        • Vasantha Kumar M.
        Comparative evaluation of dimension and surface detail accuracy of models produced by three different rapid prototype techniques.
        J Indian Prosthodont Soc. 2012; 12: 16-20
        • Brown G.B.
        • Currier G.F.
        • Kadioglu O.
        • Kierl J.P.
        Accuracy of 3-dimensional printed dental models reconstructed from digital intraoral impressions.
        Am J Orthod Dentofacial Orthop. 2018; 154: 733-739
        • Cuperus A.M.R.
        • Harms M.C.
        • Rangel F.A.
        • Bronkhorst E.M.
        • Schols J.G.J.H.
        • Breuning K.H.
        Dental models made with an intraoral scanner: a validation study.
        Am J Orthod Dentofacial Orthop. 2012; 142: 308-313
        • Saleh W.K.
        • Ariffin E.
        • Sherriff M.
        • Bister D.
        Accuracy and reproducibility of linear measurements of resin, plaster, digital and printed study-models.
        J Orthod. 2015; 42: 301-306
        • Kim K.M.
        • Lee J.S.
        • Kim K.N.
        • Shin S.W.
        Dimensional changes of dental impression materials by thermal changes.
        J Biomed Mater Res. 2001; 58: 217-220
        • Roberts C.T.
        • Richmond S.
        The design and analysis of reliability studies for the use of epidemiological and audit indices in orthodontics.
        Br J Orthod. 1997; 24: 139-147