Evaluation of Marginal Fit of CAD/CAM Ceramic Crowns and Scanning Time Using Different Intraoral Scanning Systems

Area of Science:

• Dental Materials Science
• Digital Dentistry
• Prosthodontics

Background:

• Intraoral scanners (IOS) are integral to digital dentistry workflows.
• Evaluating the performance of different IOS systems is crucial for optimizing CAD/CAM restorations.

Purpose of the Study:

• To compare the scanning time and marginal fit of CAD/CAM ceramic crowns fabricated using different intraoral scanning systems.
• To assess the impact of IOS hardware and software advancements on restoration accuracy.

Main Methods:

• Standardized 3D-printed dies were scanned ten times with Omnicam 1.0, Omnicam 2.0, and Primescan.
• Lithium disilicate crowns were milled, seated, and their marginal fit evaluated using micro-computed tomography.
• Scanning times and vertical fit values were statistically analyzed.

Main Results:

• Primescan exhibited significantly better mean vertical fit (12.3 ± 6.6 μm) compared to Omnicam 2.0 (33.8 ± 21.4 μm) and Omnicam 1.0 (46.7 ± 16.4 μm).
• Primescan also achieved the shortest mean scanning time (27.8 ± 1.9 s).
• Significant differences in scanning times and marginal fit were observed across all tested IOS systems.

Conclusions:

• The Primescan system offers superior accuracy and efficiency for fabricating CAD/CAM ceramic crowns.
• Improvements in IOS technology, including hardware and software, directly enhance the precision of digital dental restorations.