Data were statistically analyzed by 1-way ANOVA, followed by the Tukey honestly significant difference test (a¼.05). Each crown was fixed to the cast and scanned with micro-computed tomography to obtain 52 images for measuring the vertical and horizontal fit. Three fabrication techniques were used: digital impressions with Cerec 3D Bluecam scanner with titanium dioxide powder, followed by milling from IPS e.max CAD for Cerec digital impressions with E4D Laser scanner without powder, followed by milling from IPS e.max CAD for E4D and fabrication from IPS e.max Press by using the lost-wax and heat-pressing techniques. Lithium disilicate crowns were fabricated to fit an in vitro cast of a single human premolar.
![cerec bluecam scanner acquisition image capture cerec bluecam scanner acquisition image capture](http://img.tradeindia.com/fp/1/001/897/554.jpg)
The purpose of the study was to evaluate with micro-computed tomography the marginal fit of lithium disilicate crowns fabricated with different chairside CAD/CAM systems (Cerec or E4D) or the heat-pressing technique. No consensus exists concerning the acceptable ranges of marginal fit for lithium disilicate crowns fabricated with either heat-pressing techniques or computer-aided design and computer-aided manufacturing (CAD/CAM) systems.