Effects of core buildup composite resin translucency on intraoral scanner accuracy: an in vitro study

Trang Thi Ngoc Tran, Nam Cong Nhat Huynh*, Khoa Dang Nguyen, Hung Trong Hoang, Ding Han Wang, Ming Lun Hsu, Nhat Dinh Minh Nguyen, Nguyen Chi Tran

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

3 Scopus citations


Aim: The accuracy of 3D images produced by an intraoral scanner (IOS) is affected by the optical characteristics of restorative materials such as metal, ceramic, and composite resin. The present in vitro study aimed to investigate the impact of core buildup composite resin translucency on IOS accuracy. Materials and methods: A core buildup procedure was performed on a proprietary 3D-printed model using injectable composite resins in four groups with different levels of translucency (highest to lowest: AE, A3, AO3, and EX). Ten experimental scans per group were performed using a Medit i700 IOS on a phantom head-mounted model. Reference scans were obtained using an industrial scanner (Solutionix C500). Values of accuracy (trueness and precision) for the respective groups were evaluated using mean deviation values following 3D superimposition. Results: Composite resin translucency caused the scale reduction of the optical impressions. Values of trueness showed the highest scale reduction in AE, significantly, followed by A3, AO3, and EX. Considering 50 µm as the cut-off value of deviations for clinical acceptability, the analysis showed most deviations in AE and A3. Similar results were found with precision, where AE showed the highest deviation value statistically, followed by A3, AO3, and EX. Conclusions: Composite resin translucency affects the accuracy of optical impressions, causing a fitting error of CAD/CAM prostheses. The more translucent the composite resin, the less accurate the optical impression. This suggests the need for proper compensation during prosthesis designing for an optimal clinical result.

Original languageEnglish
Pages (from-to)201-210
Number of pages10
JournalInternational Journal of Computerized Dentistry
Issue number3
StatePublished - 2023


  • Genauigkeit
  • Intraoralscan
  • Komposit
  • Präzision
  • Richtigkeit
  • accuracy
  • composite resin
  • digital dentistry
  • digitale Zahnmedizin
  • intraoral scanner
  • precision
  • trueness


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