Margin gap size of ceramic inlays using second-generation CAD/CAM equipment

Area of Science:

• Dental Materials Science
• Biomaterials Engineering
• Restorative Dentistry

Background:

• Computer-assisted design/computer-assisted manufacturing (CAD/CAM) systems have advanced dental restoration fabrication.
• Evaluating the marginal fit of CAD/CAM restorations is crucial for clinical success and longevity.
• CEREC 2 represents a second-generation system with potential improvements over its predecessor, CEREC 1.

Purpose of the Study:

• To assess the marginal fit of CEREC 2 CAD/CAM inlays in Class II preparations.
• To compare the fit of CEREC 2 inlays to CEREC 1 inlays.
• To evaluate the seating ease of CEREC 2 inlays.

Main Methods:

• Standard mesio-occlusodistal preparations were made on extracted human molars.
• CEREC 2 CAD/CAM ceramic inlays were fabricated and seated.
• Digital images were captured at 100x magnification, and marginal gaps were measured using image analysis software.
• Measurements were taken at multiple locations on occlusal and interproximal margins.

Main Results:

• CEREC 2 inlays seated easily into cavity preparations without difficulty.
• Average marginal gap for CEREC 2 inlays was 80 +/- 57 microns (occlusal: 59 +/- 35 microns; interproximal: 97 +/- 66 microns).
• Marginal gap widths for CEREC 2 were smaller than those reported for CEREC 1 (occlusal: 89 +/- 65 microns; interproximal: 105 +/- 81 microns).

Conclusions:

• Improvements in CEREC 2 software and hardware enhance inlay adaptation to standard cavity preparations.
• The system demonstrates remarkable ability to create inlays that seat without interference.
• CEREC 2 offers an attractive restorative option for all-ceramic restorations due to improved fit and fabrication versatility.