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Fully automatic CAD design of the occlusal morphology of partial crowns compared to dental technicians' design

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Abstract

Objectives

The aim of this study was to compare the occlusal morphology of partial crown reconstructions made by dental technicians with reconstructions made by a fully automatic software process (biogeneric tooth model) in relation to the original natural tooth shape.

Material and methods

Stone replicas of natural teeth were measured three-dimensionally before preparing inlay and onlay cavities for ceramic restorations (n = 5). For each preparation, five reconstructions (in total n = 25) were made by five dental technicians. Additionally, reconstructions were calculated automatically by a software based on the biogeneric tooth model (Cerec 3D). In order to compare the two different kinds of reconstruction, an objective metrical similarity measure (shape similarity value, SSV) based on calculated volumes between compared datasets was used.

Results

In 22 of 25 cases, the reconstructions made by the CAD software were closer to the original situation than the reconstructions made by the technicians. Mean average SSV of reconstructions made by the technicians (310.2 ± 78.8 μm) was significantly higher (p < 0.05) than mean SSV of CAD reconstructions (biogeneric model) (222.0 ± 47.7 μm).

Conclusions

In the design of naturally shaped occlusal inlay/onlay surfaces, a fully automatic CAD system can be at least as good as conventional wax-ups by dental technicians.

Clinical relevance

The adjustment of a dental restoration to fit the morphology of surrounding tooth structures, still presents challenges for the dentist.

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Conflict of interest

The authors declare that they have no conflict of interest.

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Authors and Affiliations

  1. Department of Restorative Dentistry, University of Munich (LMU), Munich, Germany

    Andreas P. Litzenburger & Reinhard Hickel

  2. Department of Prosthodontics, University of Munich (LMU), Munich, Germany

    Maria J. Richter

  3. Division of Computerized Dentistry, Department of Preventive Dentistry, Periodontology and Cariology, Center for Dental and Oral Medicine, University of Zürich, Zürich, Switzerland

    Albert C. Mehl

  4. Department of Oral and Maxillofacial Surgery, University of Munich (LMU), Lindwurmstr. 2a, 80337, Munich, Germany

    Florian A. Probst

Authors
  1. Andreas P. Litzenburger
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  2. Reinhard Hickel
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  3. Maria J. Richter
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  4. Albert C. Mehl
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  5. Florian A. Probst
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Corresponding author

Correspondence to Florian A. Probst.

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Litzenburger, A.P., Hickel, R., Richter, M.J. et al. Fully automatic CAD design of the occlusal morphology of partial crowns compared to dental technicians' design. Clin Oral Invest 17, 491–496 (2013). https://doi.org/10.1007/s00784-012-0714-4

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  • DOI: https://doi.org/10.1007/s00784-012-0714-4

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