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Chairside measurement of the marginal and internal fit of crowns: a new intraoral scan–based approach

  • Maximiliane Amelie SchlenzEmail author
  • Jonas Adrian Helmut Vogler
  • Alexander Schmidt
  • Peter Rehmann
  • Bernd Wöstmann
Original Article
  • 45 Downloads

Abstract

Objectives

To investigate the marginal and internal fit of crowns, a new intraoral scanner–based digital approach for chairside measurement (D-IOS) was systematically analysed and compared with the conventional silicone replica technique (CV-SR) and digital 3D analysis software (D-GOM).

Materials and methods

Two models, representing different clinical situations, were constructed, and the first molar was prepared for a full-coverage crown. On the basis of an intraoral scan (Trios 3), copings of three different materials (non-precious alloy, zirconium dioxide, and resin composite) with two different cement spaces (80 μm, 50 μm) were manufactured. The fit of the copings was investigated by all three methods (CV-SR, D-IOS, D-GOM). Therefore, the cement space was visualized with low-viscosity silicone and digitalized with a second intraoral scan. Evaluation of fit by the D-IOS-method was measured in the intraoral scanner software, whereas for analysis by D-GOM, both intraoral scan datasets were transferred to 3D analysis software (GOM Inspect). The CV-SR-method was used as a control group. For all copings, the measurements were repeated five times. The data were analysed with ANOVA.

Results

No significant differences between the three evaluation methods and the coping materials were shown. However, in the occlusal area, the internal gap was significantly higher compared to the internal gap in the marginal and axial areas regardless of the cement space setting (p < .05). The target parameter of the cement spaces did not match the actual measured internal gaps.

Conclusions

All three evaluation methods and coping materials can be used for the measurement of fit within different clinical situations.

Clinical relevance

The digital chairside measurement implemented in the intraoral scanner software enables an easy, applicable evaluation of fit of crowns without additional laboratory devices or special software applications.

Keywords

Internal fit Marginal fit Chairside Intraoral scanner Replica technique CAD/CAM 

Notes

Acknowledgements

The authors would like to thank our biostatistician, Dr. Johannes Herrmann, for the statistical analysis. Furthermore, we gratefully acknowledge the support of our dental technician Thorsten Landgraf (Zahntechnikzentrum Eisenach, Germany).

Funding information

The work was supported by the Department of Prosthodontics, Justus-Liebig-University in Giessen, Germany.

Compliance with ethical standards

Conflict of interest

The authors declare that they have no conflict of interest.

Ethical approval

The use of human teeth was approved by the local ethics committee.

Informed consent

For this type of study, formal consent is not required.

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Copyright information

© Springer-Verlag GmbH Germany, part of Springer Nature 2019

Authors and Affiliations

  1. 1.Department of Prosthodontics - Dental ClinicJustus-Liebig-UniversityGiessenGermany

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