Margin discrepancies beyond 100µm may impact the survival rate by causing microleakage, staining, tooth sensitivity, recurrent caries, periodontal problems, and ultimately failure of the entire restoration ( 13, 14).
Margin quality has been described as one of the most important aspects when comes to longevity of CAD/CAM ceramic restorations ( 5- 12). Because the technology is costly, some clinicians are still using previous generations of CAD/CAM equipment to fabricate and delivery intraoral restorations. These restorations, commonly made with ceramic material, are becoming increasingly popular worldwide ( 1- 4). Cerec CAD/CAM machines are currently used to manufacture ceramic restorations based on computer-assisted design and produce a restoration on a single dental appointment.
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