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Operation of the Collaborative Composite Manufacturing CCM System
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Vertical Marginal Discrepancy Performance of a CAD-CAM System with Multiple Users.

Stpl Pereira1, H W Roberts2

  • 1Sâmela T.P.L. Pereira, DDS, MBA, assistant professor, Division of Prosthodontics, University of Kentucky College of Dentistry, Lexington, Kentucky, USA.

Operative Dentistry
|October 25, 2022
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Summary
This summary is machine-generated.

Computer-aided design-computer-aided manufacture (CAD-CAM) monolithic crowns showed minimal vertical marginal discrepancies, falling within acceptable clinical limits. Further research is needed to explore potential patterns in discrepancy locations.

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Area of Science:

  • Dental Materials Science
  • Biomaterials Engineering
  • Prosthodontics

Background:

  • Computer-aided design-computer-aided manufacture (CAD-CAM) systems offer advancements in dental restorations.
  • Assessing the marginal integrity of CAD-CAM fabricated crowns is crucial for clinical success.
  • Digital dentistry workflows require evaluation of accuracy across different providers.

Purpose of the Study:

  • To evaluate the vertical marginal discrepancies of computer-aided design-computer-aided manufacture (CAD-CAM) monolithic lithium disilicate crowns.
  • To compare discrepancies produced by different providers with varying levels of digital dentistry experience.
  • To assess discrepancies at specific time intervals during the fabrication process.

Main Methods:

  • Three inexperienced providers fabricated lithium disilicate monolithic crowns on mandibular third molars.
  • Vertical marginal discrepancy was measured using a digital microscope at 5-degree intervals (72 measurements per crown).
  • Analysis included mean and maximum discrepancy, location of maximum discrepancy, and percentage of closed margins.

Main Results:

  • The mean vertical marginal discrepancy for all specimens was 21.1 ± 5.5 μm.
  • Significant differences in mean and maximum marginal discrepancies were found between provider groups.
  • Crowns fabricated with 2-mm axial wall height and 20-degree total occlusal convergence showed significantly less discrepancy.

Conclusions:

  • CAD-CAM monolithic lithium disilicate crowns fabricated by clinicians demonstrated mean vertical marginal discrepancies below clinically acceptable values.
  • A potential pattern in the location of maximum marginal discrepancies was observed and warrants further investigation.
  • Results should be interpreted cautiously due to in vitro methodology and potential differences from clinical conditions.