Comparison of prosthetic models produced by traditional and additive manufacturing methods

Jin Young Park, Hae Young Kim, Ji Hwan Kim, Jae Hong Kim, Woong Chul Kim

Research output: Contribution to journalArticlepeer-review

43 Citations (Scopus)


PURPOSE. The purpose of this study was to verify the clinical-feasibility of additive manufacturing by comparing the accuracy of four different manufacturing methods for metal coping: the conventional lost wax technique (CLWT); subtractive methods with wax blank milling (WBM); and two additive methods, multi jet modeling (MJM), and micro-stereolithography (Micro-SLA). MATERIALS AND METHODS. Thirty study models were created using an acrylic model with the maxillary upper right canine, first premolar, and first molar teeth. Based on the scan files from a non-contact blue light scanner (Identica; Medit Co. Ltd., Seoul, Korea), thirty cores were produced using the WBM, MJM, and Micro-SLA methods, respectively, and another thirty frameworks were produced using the CLWT method. To measure the marginal and internal gap, the silicone replica method was adopted, and the silicone images obtained were evaluated using a digital microscope (KH-7700; Hirox, Tokyo, Japan) at 140X magnification. Analyses were performed using two-way analysis of variance (ANOVA) and Tukey post hoc test (α=.05). RESULTS. The mean marginal gaps and internal gaps showed significant differences according to tooth type (P<.001 and P<.001, respectively) and manufacturing method (P<.037 and P<.001, respectively). Micro-SLA did not show any significant difference from CLWT regarding mean marginal gap compared to the WBM and MJM methods. CONCLUSION. The mean values of gaps resulting from the four different manufacturing methods were within a clinically allowable range, and, thus, the clinical use of additive manufacturing methods is acceptable as an alternative to the traditional lost wax-technique and subtractive manufacturing.

Original languageEnglish
Pages (from-to)294-302
Number of pages9
JournalJournal of Advanced Prosthodontics
Issue number4
Publication statusPublished - 2015

Bibliographical note

Publisher Copyright:
© 2015 The Korean Academy of Prosthodontics.


  • Additive manufacturing
  • Internal gap
  • Marginal gap
  • Micro-SLA
  • Multi Jet Modeling
  • Subtractive manufacturing

ASJC Scopus subject areas

  • Oral Surgery
  • Dentistry (miscellaneous)


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