Accuracy of digital models generated by conventional impression/plaster-model methods and intraoral scanning

Yuki Tomita, Jun Uechi, Masahiro Konno, Saera Sasamoto, Masahiro Iijima, Itaru Mizoguchi

Research output: Contribution to journalArticlepeer-review

51 Citations (Scopus)


We compared the accuracy of digital models generated by desktop-scanning of conventional impression/plaster models versus intraoral scanning. Eight ceramic spheres were attached to the buccal molar regions of dental epoxy models, and reference linear-distance measurement were determined using a contact-type coordinate measuring instrument. Alginate (AI group) and silicone (SI group) impressions were taken and converted into cast models using dental stone; the models were scanned using desktop scanner. As an alternative, intraoral scans were taken using an intraoral scanner, and digital models were generated from these scans (IOS group). Twelve linear-distance measurement combinations were calculated between different sphere-centers for all digital models. There were no significant differences among the three groups using total of six linear-distance measurements. When limited to five lineardistance measurement, the IOS group showed significantly higher accuracy compared to the AI and SI groups. Intraoral scans may be more accurate compared to scans of conventional impression/plaster models.

Original languageEnglish
Article numberdmj/2017-208
Pages (from-to)628-633
Number of pages6
JournalDental materials journal
Issue number4
Publication statusPublished - 2018
Externally publishedYes


  • Digital model
  • Impression
  • Intraoral scanning
  • Plaster model

ASJC Scopus subject areas

  • Ceramics and Composites
  • Dentistry(all)


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